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Reading 54_Wenger_2002 Heavy Oil SPE
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Multiple Controls on Petroleum Biodegradation and Impact on Oil Quality
Lloyd M. Wenger, Cara L. Davis, and Gary H. Isaksen, ExxonMobil Upstream Research Co. Summary Biodegradation of oils in nature is important in reservoirs cooler than approximately 80C. Oils from shallower, cooler reservoirs tend to be progressively more biodegraded than those in deeper, hotter reservoirs. Increasing levels of biodegradation generally cause a decline in oil quality, diminishing the producibility and value of the oil as API gravity and distillate yields decrease; in addition, viscosity, sulfur, asphaltene, metals, vacuum residua, and total acid numbers increase. For a specific hydrocarbon system (similar source type and level of maturity), general trends exist for oil-quality parameters vs. present-day reservoir temperatures of <80C. However, other controls on biodegradation may also have significant effects, making predrill prediction of oil quality difficult in some areas. It has long been observed that fresh, oxygenated waters in contact with reservoir oil can cause extensive aerobic biodegradation. More recently, it has been recognized that anaerobic sulfatereducing and fermenting bacteria also can degrade petroleum. Highly saline formation waters may inhibit bacterial degradation and effectively shield oils from oil-quality deterioration. The timing of hydrocarbon charge(s) and the post-charge temperature history of the reservoir can have major effects on oil quality. Reservoirs undergoing current charging with hydrocarbons may overwhelm the ability of bacteria to degrade the oil, resulting in better-than-anticipated oil quality. Fresh charge to reservoirs containing previously degraded oil will upgrade oil quality. Calibrated methods of oil-quality risking, based on a detailed evaluation of reservoir charge and temperature history and local controls on biodegradation, need to be developed on a play and prospect basis. Introduction Biodegradation of hydrocarbons, and the resulting decline in oil quality, is common in reservoirs cooler than approximately 80C. Petroleum biodegrading organisms have a specific order of preference for compounds that they remove from oils and gases. Progressive degradation of crude oil tends to remove saturated hydrocarbons first, concentrating heavy polar and asphaltene components in the residual oil. This leads to decreasing oil quality by lowering API gravity while increasing viscosity, sulfur, and metals contents. In addition to lowering reservoir recovery efficiencies, the economic value of the oil generally decreases with biodegradation owing to a decrease in refinery distillate yields and an increase in vacuum residua yields. Furthermore, biodegradation leads to the formation of naphthenic acid compounds, which increase the acidity of the oil (typically measured as Total Acid Number, or TAN). Increased TAN may further reduce the value of the oil and may contribute to production and downstream handling problems such as corrosion and the formation of emulsions. Reservoir gas caps and solution gases also undergo biodegradation in cool reservoirs. C2+ gas components, particularly propane (C3) and n-butane (n-C4), are preferentially removed from natural gas, making biodegraded gases drier through the enrichment of methane (C1). Most biodegrading organisms also generate carbon dioxide (CO2) as a byproduct when they degrade hydrocarbons, increasing the CO2 content of solution gas or gas caps. Elevated CO2 contents can impact development economics negatively by necessitating the use of special steels to resist corrosion. Evaluating the decline in hydrocarbon quality associated with biodegradation has become critical in recent years as offshore drilling has progressed into deeper water depths. In many areas (e.g., offshore west Africa, Brazil, mid-Norway, South Caspian, eastern Canada), reservoir targets in deep-to-ultradeep water are shallow, and geothermal gradients are low. These factors make oil quality a major risk because decreased recovery efficiency and oil value compound with higher deepwater operating costs to significantly impact economics, even on major discoveries. Risking oil quality predrill in shallow compartments is a major challenge. Reservoir temperature and the consequent level of biodegradation must be estimated. To do this, knowledge of the primary (generative), undegraded oil composition is essential. The major controls on primary oil composition are characteristics of the source rock: (1) organic-matter type, (2) depositional environment, and (3) level of maturity. These controls exert the dominant influence on as-generated gravity, viscosity, gas/oil ratio (GOR), sulfur, and residua contents. Geochemical analyses of natural oil seepage on the sea bottom often provide direct evidence for evaluation of source-rock characteristics (sedimentary facies) and maturity. Thermal modeling of hydrocarbon generation timing and mapping of source rocks from seismic also contribute to the understanding of the hydrocarbon system. After emplacement in cool reservoirs, hydrocarbons are subject to biodegradation, in addition to a number of other potential alteration processes, including water washing, phase separation, gravity segregation, and de-asphalting. Some reservoirs have a complex history with multiple episodes of charge and degradation. Fresh charge to a reservoir may upgrade quality, while earlier episodes of severe degradation (possibly when the reservoir was shallower and cooler than at present) may downgrade quality. Thus, knowledge of generation and charge timing and reservoir temperature history can help improve predrill predictions of oil quality. Oil and Gas Quality Oil and gas quality reflects the compositional characteristics of hydrocarbons that impact the economic viability of an exploration, development, or production opportunity. Compositions may affect the direct value of the product (e.g., crude valuation relative to a benchmark oil) or the development or facility costs (e.g., additional wells required, emulsion processing, use of special steels), or they may even cause the oil to be unrecoverable. Typical oilquality properties include API gravity, viscosity, sulfur, asphaltene, and metals (e.g., vanadium, nickel, and iron content), residua (e.g., vacuum residua or Conradson carbon content), acidity (TAN), wax content or pour point, and sensitivity to emulsion formation upon production. Biodegradation impacts essentially all oil-quality properties. Gas quality reflects the content and distribution of hydrocarbon gas constituents and the presence and content of nonhydrocarbon gases, such as H2S and CO2. Within the hydrocarbon gases, heating value (e.g., BTUs) increases with methane content and declines with wet gas (C2+) content on a per mass unit basis. Generally, the increased value of individual natural gas liquids encourages the
Copyright 2002 Society of Petroleum Engineers This paper (SPE 80168) was revised for publication from paper SPE 71450, first presented at the 2001 SPE Annual Technical Conference and Exhibition, New Orleans, 30 September3 October. Original manuscript received for review 18 November 2001. Revised manuscript received 29 July 2002. Paper peer approved 22 August 2002.
October 2002 SPE Reservoir Evaluation & Engineering
Reservoir Temperature,
Level of Gas
Biodegradation None Slight
Moderate Heavy Severe
40 200 400 600 GOR, scf/STB 800 1,000
Reservoir Temperature, oC
7 %C2+ HCs 14
Level of Gas Biodegradation None Slight Moderate Heavy Severe
Fig. 1Reservoir temperature vs. gas/oil ratio (GOR) by level of solution gas biodegradation for oil reservoirs in an area with a marine organic-matter-type source. GOR generally declines with increasing level of biodegradation; scf/STB0.1781076= m3/m3.
Fig. 2Reservoir temperature vs. %C2+ hydrocarbons by level of solution gas biodegradation for solution gases from oil reservoirs in an area with marine organic-matter-type source. Gases become drier with increasing levels of biodegradation.
separation of wet gas components during gas processing. Gas biodegradation decreases GOR (Fig. 1) and wet gas percentages (Fig. 2) and increases the percentage of CO2 (Fig. 3). H2S in gas causes significant handling and processing expense because of its high toxicity and corrosivity (sulfuric acid is formed when H2S interacts with water). Small amounts of H2S (as low as 4 ppm) impact handling and economics and can result from reservoir souring initiated by the addition of sulfate to the reservoir during waterflood operations and the consequent activities of sulfate-reducing bacteria.14 High H2S contents may be the result of thermochemical sulfate reduction in gas-bearing, hightemperature, carbonate, and anhydrite reservoirs, or off-structure in an overmature drainage area. CO2 levels in natural gas have a variety of sources and controls: High contents of CO2 (>15%) in natural gases may result from high-temperature thermal decomposition of carbonate rocks (limestone and dolomite). Lower-level CO2 (<2.5%) in gases may originate from early thermal maturation of organic matter in source rocks (although much generated CO2 is subject to loss owing to high water solubility). These sources of CO2 can be differentiated by their carbon isotopic compositions. Land-plant organic material generates more CO2 than marine-algal organic matter. Oxidation of oil and gas by hydrocarbon-degrading bacteria in shallow, cool reservoirs may produce elevated CO2 contents (Fig. 3). CO2 in gas causes corrosion in production facilities because of its acidity when dissolved in water and can require the use of special steels when contents are >5%. High CO2 content also increases the cost of surface gas processing. Source and Maturity Controls on Hydrocarbon Products and Composition Organic-matter type, depositional environment, and the source rocks level of thermal maturity determine primary (generative) oil quality. Organic-matter type provides initial constraints on the expected hydrocarbon products and their distribution. Landderived plant material tends to generate gas plus liquids, while marine algal organic matter generally produces liquids. Liquids from land-plant organic matter are often lighter and waxier and contain less sulfur and polar and asphaltenic material compared to marine-algal-derived oils. Not all land-plant organic matter has equal generation potential; some types are more oil-prone (e.g., the Niger Delta and southeast Asia are known for an abundance of land-plant-derived oil along with gas). Source rocks dominated by land-plant organic matter tend to show more lateral and vertical variability in organic-matter type than those dominated by marine algal organic matter. The depositional environment in which source rocks are deposited is also very important in controlling primary oil composi376
90 80 70 60 50 400.0
6.0 8.0 %CO2
Fig. 3Reservoir temperature vs. %CO2 by level of solution gas biodegradation for solution gases from oil reservoirs in an area with marine organic-matter-type source. CO2 content generally increases with increasing levels of biodegradation.
tion. Source rocks are most commonly deposited subaqueously in anoxic-to-dysoxic bottomwater conditions that promote the preservation of organic matter. In marine depositional settings, sulfatereducing bacteria rework sedimentary organic matter under anaerobic conditions, producing H2S as a byproduct. Clays usually provide iron to the depositional environment, which reacts rapidly with any available H2S to form iron sulfides (precursors of pyrite). When iron is not available, H2S produced by sulfate-reducing bacteria may accumulate to high levels and be incorporated into organic-sulfur compounds. Therefore, in clastic-dominated (shale) source-rock environments, sulfur is dominantly incorporated into mineral phases. In carbonate and marly depositional environments where clays are scarce, organic matter tends to be sulfur-rich. Compared to clastic source rocks, carbonate and marly sources with sulfur-rich organic matter begin oil generation at lower thermal maturity levels and yield heavy, high-sulfur oil with more residua content and other detrimental components such as metals. Shale source rocks from depositional environments rich in clay and iron tend to generate lighter, sweeter oils. The maturity level of a source rock is a measure of the dominantly thermal stress it has experienced. The level of maturity needed for hydrocarbon generation depends on the organic-matter type, composition, and depositional setting. For a given source rock, early-generated oils tend to be heavier and have poorer oil quality (e.g., lower API gravity and higher sulfur contents). At progressively higher levels of maturity, generated liquids contain fewer high-molecular-weight hydrocarbons and polar components. Hence, oil quality and value typically increase at higher levels of maturity within the oil-generative window (if maturity is too
high, gas may be produced instead of oil). For an equivalent level of biodegradation, higher-maturity oil typically maintains better oil quality than lower-maturity oil from the same source. Generalized ranges of initial (as-generated) hydrocarbon properties for different source-rock types, at their respective mainstage- generation maturity levels, are summarized in Table 1. Biodegradation and Impact on Oil Quality Bacterial degradation of oils in reservoirs has long been recognized.57 Many of the early examples that cited in-reservoir biodegradation and oil-quality decline were from shallow, onshore oil fields in which meteoric water influx was suspected. This observation contributed to the dogma that biodegradation of oil was carried out by aerobic bacteria only and required a supply of oxygen to the reservoir.810 Shallow onshore reservoirs with hydrodynamic drive from fresh meteoric influx are certainly prime candidates for heavy biodegradation. However, as drilling progressed offshore into deep water, observations of biodegradation in shallow, cool reservoirs continued to be commonplace. In these areas, it was difficult to explain where fresh, oxygenated water could be coming from. This led to the conclusion that anaerobic bacteria, such as the sulfate-reducing bacteria, must be capable of biodegrading petroleum. Recent studies from the bacteriologic literature1117 have verified that sulfate-reducing bacteria, iron oxidereducing bacteria, and bicarbonate-reducing (fermenting) bacteria are capable of biodegrading oils in reservoirs in the absence of dissolved oxygen. In addition to an oxygen source (free or combined), bacteria need water and certain nutrients to metabolize hydrocarbons. Adequate pore size and surface area are also necessary. The connections between oil quality, microbes, and reservoir properties are summarized in Fig. 4. Although traditional dogma also suggested that biodegradation must occur at the oil/water contact, recent findings suggest that biodegradation may occur elsewhere in the hydrocarbon column. Irreducible (bound) water within the reservoir may provide an adequate water supply, and bacteria have been observed inhabiting the interface between water adsorbed to mineral grains and hydrocarbons in pore spaces. The high solubility of water in natural gas at relatively low temperatures and pressures, especially if CO2 is present, may further enhance biodegradation. The reservoir temperature range is critical to bacterial degradation. Above temperatures of approximately 82C, petroleumdegrading bacterial activity is significantly inhibited. At temperatures just below this limit, bacteria are generally operating at lessened efficiency. Lower-temperature reservoirs (e.g., <50C) are much more likely to undergo heavy-to-severe degradation. Formation-water salinity also may impact the efficiency of biodegrading bacteria, necessitating consideration of the combined temperaturesalinity environment. High formation-water salinities appear to lower the maximum temperature at which petroleum biodegradation can occur.11 Thus, it is possible that relatively shallow, cool reservoirs in salt-diapir provinces with high formation-water salinity levels may protect oils from biodegradation. This is difficult to document conclusively because formation-water salinity levels are known to be highly variable around salt diapers,18 and ad-
Oil Quality
Specific Biodegradation
Controls on Oil Biodegradation
Reservoir Properties Growth Requirements
- Different microbes degrade different oil components - Reservoir properties restrict the variety of HC degrading microbes
- Availability of oxidant ( e.g., O2 , FeO, SO4 , HCO3 ) - Salinity - Temperature - Porosity/permeability/surface area
Fig. 4Connections between oil quality, microbes, and reservoir properties. (Figure provided by Steve Hinton, ExxonMobil Corporate Strategic Research Co.)
equate water samples or log data to map isohaline contours rarely exist. In addition, the recharging of reservoirs with fresh hydrocarbons along salt diapir faults may result in better-than-expected oil quality. Collapsed salt stocks associated with salt diapirs, particularly when source-rock intervals are penetrated by the stock, are thought to be among the most effective hydrocarbon migration pathways to reservoirs.19,20 In areas with active hydrocarbon systems, it can be difficult to determine whether relatively undegraded oils in cool reservoirs adjacent to salt are the result of reduced biodegradation caused by high water salinity or the result of a very recent hydrocarbon charge. The impact of biodegradation on oil-quality parameters can be significant. As biodegradation progresses, compounds are removed from oil according to the sequence shown in Table 2. Although different bacterial types and reservoir environments do have some effect on the order of compounds removed, the general order-of-preference trends described are usually applicable. The straight chain n-alkanes are typically attacked before branched saturates (e.g., isoprenoids), cyclic saturates, and aromatic hydrocarbons. A series of whole oil gas chromatograms (GCs), which illustrate the impact of increasing biodegradation levels on GC appearance and bulk fluid properties, is illustrated in Fig. 5. All these oils are from the same basin and have been generated from the same source-rock facies at similar maturities. The multiringed biomarker compounds tend to be resistant through moderate-toheavy biodegradation levels, and they provide an excellent means of correlating biodegraded and unbiodegraded oils. Large differences in GC distributions and bulk properties of the oils shown in Fig. 6 are tied directly to the level of biodegradation. The unbiodegraded oil in Fig. 5 largely reflects the composition of the original oil as generated from its marine shale source rock
TABLE 2REMOVAL OF SELECTED COMPOUND GROUPS AT VARIOUS LEVELS OF BIODEGRADATION*
Level of Biodegradation
very slight
C 1-C 5 gases methane ethane propane iso -butane n -butane pentanes
n -alkanes iso -alkanes isoprenoids BTEX aromatics alkylcyclohexanes n -alkanes, iso -alkanes isoprenoids napthalenes (C 10+) phenanthrenes, DBTs chrysenes regular steranes C30-C 35 hopanes C27-C 29 hopanes triaromatic steranes monoaromatic steranes gammacerane oleanane C21-C 22 steranes tricyclic terpanes diasteranes diahopanes 25-norhopanes** seco-hopanes**
*Table represents a generalized sequence of degradation. Different biodegradation pathways (aerobic vs. anaerobic) and different types of bacteria will attack specific molecules and compound ranges. Degradation sequence is based on observation of reservoired oils and seabottom seeps. BTEX refers to benzene, toluene, ethylbenzene, and xylene. **Appearance, rather than removal of compounds (these compounds believed to be created during biodegradation).
C 15-C 35 biomarkers
C 15-C 35 HCs
C 6-C 15 HCs
at mainstage oil-window maturity levels (36 to 37 API with a GOR of 800 scf/STB). The complete suite of n-alkanes is intact, and n-alkanes are greater than adjacent isoprenoids (e.g., as monitored by pristane/n-C17 and phytane/n-C18 ratios). The unresolved complex mixture (UCM) of branched and cyclic compounds under the resolved peak envelope on the GC is small. With very slight biodegradation, n-alkanes in the approximately C8C15 range are attacked first, as illustrated in Fig. 5. By the next stage (slight biodegradation), this carbon-number range is further depleted, and isoprenoid-to-alkane ratios increase as the >C15+ n-alkanes are attacked. Note in Fig. 5 that at the slight biodegradation stage, pristane >n-C17 and phytane >n-C18, and the UCM is slightly larger. For moderate levels of biodegradation, n-alkanes are significantly depleted, and the UCM hump is much larger. The isoprenoids survive, and the pristane/phytane ratio is still unaltered and virtually the same as the less-degraded oils. By the heavy biodegradation stage, virtually all n-alkanes and isoprenoids have been removed and the UCM hump is large. For all the oils in the biodegradation series shown in Fig. 5, the multiring biomarkers remain unaltered, even at heavy levels of biodegradation. These compounds are not typically detected in GCs; rather, they are monitored by combination GC/mass spectroscopy for genetic source and maturity information. These components are relatively resistant to biodegradation and are very useful in extracting geochemical affinities from highly degraded samples and providing a means for correlation of unbiodegraded and biodegraded oils. Eventually, the biomarker components are also subject to alteration as biodegradation goes beyond heavy into the severe stage. Within the various biomarker groups, there is also a general order of removal by bacteria (Table 2). If biodegradation
reaches extremely severe levels, a series of compounds (25-nordemethylated hopanes) is formed in response to bacterially mediated ring-opening processes. The co-occurrence of demethylated hopanes with less-resistant components (e.g., n-alkanes) is strong evidence for a multigeneration charge and degradation history, where severe biodegradation of an initial charge is followed by later recharge and, possibly, additional biodegradation. The biodegradation stages described herein and presented in Table 1 have been used to describe the alteration state of hydrocarbons in reservoirs and to describe the predicted biodegradation level as it relates to oil quality in unpenetrated compartments. Published biodegradation scales21 have limited applicability for oil-quality assessments in the industry because they are focused on heavy and severe biodegradation when complete removal of certain compound series (e.g., n-alkanes, isoprenoids) and the alteration of biomarker components occurs. However, the greatest impact on oil-quality parameters for conventional production occurs at much lower levels of biodegradation. In deepwater offshore plays, oil-quality reduction caused by biodegradation may render a discovery uneconomic without proceeding to levels at which any of the more resistant biomarker constituents have been altered. An example of a complicated alteration history is shown in Fig. 6. Geochemical analyses were performed on oils from two reservoirs in the same well. The shallower reservoir contains the demethylated hopane series, indicating that severe biodegradation has occurred. It also contains a full suite of n-alkanes and regular hopanes, which are incompatible with the demethylated hopanes unless multiple charges have occurred. The present reservoir temperature (85C) is too high to support ongoing biodegradation. Therefore, the shallower oil was probably emplaced when the
Fig. 5Whole oil GCs illustrating the progression of increasing biodegradation and the decline in oil quality. All oils are from the same basin, but from different depths and or wells, and have essentially identical source and maturity, as indicated by biomarker distributions (not shown). Increasing pristane/n-C17 ratio illustrates the preference for n-alkanes over isoprenoids in biodegradation. N-alkanes over the approximately C8C15 range are attacked first. (Pr=pristane; Ph=phytane; MCH=methyl cyclohexane; n-C6...=homologous n-alkane series.)
reservoir was shallower and cooler than it is today. Severe biodegradation was then followed by later recharge. Oil from the deeper, hotter reservoir has a GC very similar to that for the shallower reservoir, with a full, unaltered suite of n-alkanes. However, the deeper oil does not contain any demethylated hopanes and shows no other evidence of biodegradation. As a consequence, the deeper oil is 10 lighter in API gravity. Progressive biodegradation almost invariably reduces oil quality. As the high-quality saturated hydrocarbons are removed, there is residual enhancement of the low-quality, high-molecular-weight multiring hydrocarbons and the nonhydrocarbon compounds, such as asphaltenes. These compositional changes lead to lower gravity, higher viscosity, and higher sulfur, nitrogen, and asphaltene contents. Metals, ash, and residua contents also are enhanced. These changes result in lower value for the crude oil, diminished recovery efficiency, and possible additional production problems associated with handling and processing heavier oils. One oil-quality parameter that does not always get worse with biodegradation is wax content. High wax content and high pour-point oils are common in areas such as southeastern Asia. Because waxes are highmolecular-weight n-alkanes, they are attacked at slight-tomoderate biodegradation levels. Although this loss may contribute to decreased API gravity, a slight API decrease is often offset by lowered pour points and less wax deposition in tubulars and facilities. In addition to the concentration of low-quality oil components during biodegradation, new compounds can be formed that negatively impact quality. Bacteria appear to manufacture acids, most of which are naphthenic (i.e., cyclic) acids, during the biodegradation of petroleum.22 Because of solubility differences, lowmolecular-weight (C1-C5) acids occur predominantly in associated
formation waters,23 while higher-molecular-weight species (C6+) are concentrated in the oil phase. The distribution of the various naphthenic acid species in oils is poorly understood. Acid contents are usually monitored as a TAN determined by potentiometric titration as per the ASTM D-664 method. This method is wrought with potential interferences and interpretive problems,24 but it remains a standard method by which oils are assayed and valued. TAN generally increases with increasing levels of biodegradation. The current activity of biodegrading organisms may be most important in determining organic acid contents because acids may dissipate rapidly owing to relatively high water solubility and reactivity. Elevated naphthenic acid contents (TAN >1 mgKOH/goil) are detrimental to crude-oil value because acids cause refinery equipment corrosion at high temperatures.2527 This can result in an additional valuation debit. Naphthenic acids and their salts (naphthenates) also may lead to the formation of emulsions upon production of biodegraded oils. Sometimes these emulsions can be tight and difficult to break by conventional means. The additional expense associated with breaking emulsions, especially on production platform sites in deep water, can further challenge field economics. Low-molecular-weight organic acids in water often impart very foul odors and can cause wastewater disposal problems in refineries processing some biodegraded oils. Biodegradation and Impact on Gas Quality Biodegradation of natural gases generally decreases the GOR (solution gas in oil legs) and wet gas content and increases the relative proportion of methane (gas caps and solution gases), as illustrated in Figs. 1 through 3. Biodegradation also may cause CO2 contents to increase (a byproduct of bacterial oxidation). In addition to
Fig. 6Comparison of whole oil GCs and mass/charge (m/z) 177 biomarker scans for two reservoirs from Well A. The deeper reservoir shows no evidence of biodegradation, while the shallower shows biomarker evidence of severe biodegradation, followed by recharge with fresh oil. Current reservoir temperatures in both reservoirs are too high for active biodegradation. Geochemical analyses constrain the filling and degradation history of reservoirs. [C28DM=C28-25-nor-demethylated hopane; C29DM=C29-25nor-demethylated hopane; C29H=C29 hopane; C29Ts=C29-22,29,30-norhopane; C29M=C29 normoretane; OL=oleanane; C30DM(1) & (2)= C30-25-nor-demethylated hopanes; C31DM=C31-25-nor-demethylated hopanes; C31H=C31 hopanes; C32DM=C32-25-nordemethylated hopanes; C32H=C32 hopanes; C33H=C33 hopanes; C34H=C34 hopanes; C35H=C35 hopanes; peak labels on whole oil GCs as per Fig. 5.]
compositional changes, bacterial degradation causes carbon isotopic changes in individual gas components. Geochemical analyses of reservoir gases from around the world have shown that bacteria preferentially attack propane during the initial stages of biodegradation.27,28 The decrease in concentrations of propane is accompanied by a fractionation of the stable carbon isotopic composition. During biodegradation, the residual (parent) propane fraction becomes enriched in the heavier 13C isotope, whereas the CO2 byproduct (daughter) is isotopically enriched in 12C. Bacterialenzymatic processes and C-C bond energies control these compositional and isotopic changes.29 Less energy is required to break a 12 C-12C than a 12C-13C bond, and bacteria follow the path of greatest reward (energy from oxidation) for the least amount of work (bond energies). A comparison of gas analyses from a North Sea field (see Table 2 and Fig. 7) with gases from two nearby fields indicates that the reservoirs contain three distinct gas compositional groupings. All fields received the same hydrocarbon charge. Relatively heavy isotopic compositions for wet gas (C2+) components in Field C gases suggest significant biodegradation. Gases from Fields B and A show less intense alteration (Fig. 7). The relative intensity of biodegradation becomes apparent when the isotopic difference between propane and n-butane is plotted against the isotopic composition of propane (Fig. 8). This trend results from the fact that propane is degraded preferentially to n-butane. For samples from Field B, biodegradation is greatest for Sample 1 and least for Sample 12. Molecular compositions also support the degradation trend indicated by isotopic compositions.
-24 Sample 1 -25 Sample 3 Sample 5
Field C
13C ( vs. PDB)
-26 Sample 10 -27 Field B Sample 13 Sample 17 -28
-29 Field A -30
-31 Ethane
-Butane
i -Butane
Fig. 7Average wet gas isotope ratios for select North Sea fields. Stable carbon isotopic ratios are plotted against the wetgas components.
In biodegraded samples, propane is depleted relative to n-butane, and n-butane is depleted relative to i-butane. Other In-Reservoir Alteration Processes In addition to biodegradation, other in-reservoir alteration processes can impact hydrocarbon quality. These include water washing, phase separation, gravity segregation, gas de-asphalting, and in-reservoir oil cracking. These processes are reviewed as follows and summarized in Fig. 9.
2 Well 1-4
soluble (e.g., aromatic hydrocarbon) components of similar molecular weights. Gravity Segregation. The stratification of an oil column by density is referred to as gravity segregation. This process typically requires high permeability and most often occurs in steeply dipping reservoirs where heavy-end components from the oil settle to the lower portion of the reservoir. There may be a time requirement for the development of a segregated column. Gas De-Asphalting. De-asphalting of oils in the refinery is often accomplished by bubbling natural gas through the oil. This destabilizes heavy asphaltene molecules, causing their precipitation. This same process can occur in reservoirs if gas is directed into an oil reservoir through diapir-related reservoir tilting or other geologic processes. Tar mats commonly result from in-reservoir gas de-asphalting. In-Reservoir Cracking. The thermal cracking of oils in reservoirs occurs when the reservoirs are exposed to high temperatures (>150C), usually because of deep burial. As heavier oil components thermally crack into lighter molecules, a lighter hydrocarbon product results. Should burial to higher temperatures continue, further cracking might result, ultimately yielding gas and solid bitumen residue (pyro-bitumen). Applications of Biodegradation and Oil Quality to Prospect Evaluation and Risking Exploration Risking and Block Ranking. Oil-quality risking is an important assessment parameter when making exploration decisions regarding the viability of plays or prospects. Calibrations of expected reservoir temperature and biodegradation level to oilquality parameters provide the groundwork for predrill predictions. Local calibration of parameters, or selection of appropriate analogs, is critical because degradation trends are dependent on effective hydrocarbon system(s) and are tied to source type, source depositional environment, maturity, and filling history.34 Selection of the appropriate biodegradation trend calibration is based on the geochemistry of nearby discoveries or shows, if available. In many deepwater frontier areas, surface hydrocarbon seeps provide initial information on source type and maturity level before any drilling.35 In the absence of geochemical data on actual hydrocarbon samples, the characteristics of the effective source can be estimated from depositional models and thermal yield calculations.36 Field Development. Geochemical analyses and interpretations, when integrated with pressure trends and a geologic and geophysical framework, provide important input to development and production planning. Exploitation geochemical approaches are especially pertinent to help determine continuity or segmentation of reservoir compartments when pressure or geologic data are ambiguous. Understanding reservoir continuity is critical to optimizing field-development planning. Identification of reservoir segmentation is also important to the efficient placement of injector/ producer pairs when pressure maintenance by water injection is planned. Differences in biodegradation level can sometimes indicate segmented compartments. Geochemical analyses also can detect gradients in hydrocarbon properties within continuous reservoirs (e.g., caused by gravity segregation). Recognition of such gradients is important for reservoir models and field planning. In heavy-oil fields, geochemical analyses of sidewall cores can help to identify oil-quality variations and sweet spots for targeted production. Corrosion/Facilities Design. As exploration proceeds into deeper water offshore, biodegraded oils appear to be more commonly encountered in many basins as cool, shallow reservoirs are penetrated. An increasing number of elevated TAN oils will therefore be developed and produced in the future. In addition to lower crude values resulting from high-temperature corrosion problems in refineries, biodegraded oils tend to have associated problems such as tight emulsion formation. The need to handle and remediate pro381
Well 5-8 Well 9-12 Well 13-16
13C propane - 13C n-butane
n si ea cr
io B
d ra eg
i at
Well 17-18
12 7 15 13 4 10 11
-1.5 -29 -28 -27 -26 -25 -24
13C propane ( vs. PDB)
Fig. 8Biodegradation of wet gases in select North Sea fields. The difference in isotopic ratios between propane and n-butane is plotted against the stable carbon isotopic ratio of propane to show the increase in biodegradation of wet gases toward the upper right in the plot. Sample labels refer to the sample numbers in Table 3.
(PVT effects) Conditions
Reservoir Alteration
Thermochemical SO4 Reduction
Bacterial Activity
GAS DE-ASPHALTING
GRAVITY SEGREGATION
PHASE-SEPARATION
WATER WASHING
History of charge, Migration Alteration
Generative HC properties
Increasing Source Facies Maturity
reservoir conditions
HC Yield
OIL & GAS QUALITY:
C -C
Value and producibility
Fig. 9Summary of factors affecting oil and gas quality. Source facies and level of maturity control generative hydrocarbon (HC) composition. After potential fractionation along the migration pathway, a range of possible processes can occur in the reservoir, including biodegradation at temperatures lower than approximately 82C. The timing of HC charge event(s) and the temperature history of the reservoir after filling also ultimately contribute to the quality of oil and gas in the reservoir.
Water Washing. Alteration of oil by water washing occurs when the most water-soluble components (e.g., light aromatic hydrocarbons) are removed from the oil by contact with formation waters. The limited solubility of hydrocarbons in water increases at higher temperatures and pressures and declines with increasing salinity.30,31 Water washing often occurs simultaneously with biodegradation in reservoirs < 80C. The two processes are sometimes difficult to distinguish. Phase Separation. When both gas and oil phases are present in a reservoir, faulting or other seal-related processes may allow gas to escape preferentially. This gas may migrate to a shallower reservoir where lower pressure and temperature conditions cause exsolution of a lighter liquid phase. The residual oil remaining in the deeper reservoir will be light-end depleted and generally of poorer quality than it was before gas loss32,33 occurred. Phase separation is generally recognized by the relative enrichment or depletion of more gas-soluble (e.g., saturated hydrocarbons) vs. less gasOctober 2002 SPE Reservoir Evaluation & Engineering
duced fluids on deepwater production sites will continue to impact and challenge economic scenarios. An increased understanding of biodegradation processes, including the origin and molecularweight-range distributions of organic acids and related compounds in oils and waters, can aid in early recognition and reconciliation of potential problems while in the planning stages. This permits better early valuation of new crude-oil grades and early recognition of processing and handling requirements impacting both upstream and downstream business decisions. Conclusions Oil and gas quality determines the direct value of a hydrocarbon product and the economics of its development. Hydrocarbon quality is determined by source-rock composition and thermal maturity and by the degree of alteration. Biodegradation is the most important process altering reservoir hydrocarbons in many areas, but water washing, phase separation, gravity segregation, gas deasphalting, and thermal cracking also can impact hydrocarbon quality. Biodegradation, active at reservoir temperatures <80C, can significantly reduce hydrocarbon quality, particularly in the shallow, cool reservoirs that have dominated recent deepwater exploration. As biodegrading organisms attack higher-quality hydrocarbon components, they residually concentrate poor-quality components, including sulfur, asphaltenes, and residua. Because bacteria attack different hydrocarbon compounds based on an order of preference, the biodegradation stage can be determined based on the alteration of specific compound classes and structures. The classification of biodegradation stages presented herein is important for describing and predicting oil and gas quality. Some compounds are produced during biodegradation, notably naphthenic acids and demethylated hopanes. Naphthenic acids contribute to oil-quality debits and may cause additional processing and downstream handling problems. Bacterial activity is strongly controlled by temperature, but it also may be impacted by formationwater salinity, availability of free or combined oxygen, reservoir characteristics, and the timing of charge(s). Gas biodegradation results in the decline and loss of wet components and, often, the production of undesirable gases such as CO2. The stage of gas biodegradation is not necessarily linked to that of the associated oil.
Geochemical analyses are relatively quick and inexpensive and provide critical information regarding oil and gas quality. If calibration data are available, predictive models of oil and gas degradation often can be constructed that improve predrill estimates of hydrocarbon quality during the exploration and development phases. After production commences, routine collection and analysis of fluid samples at little cost can allow changes in production characteristics to be determined and efficiently exploited. Applications include recognition of the production-stimulated breakdown of natural reservoir baffles, rapid and inexpensive diagnosis of tubing or casing damage, and production allocation from commingled reservoirs. It is therefore critical to collect and analyze representative samples through all phases of a fields history. Wireline or drillstem test samples from early exploration often provide the only characterization of individual reservoir zones before commingling. Even the analysis of sidewall cores in reservoir zones can provide important information. Later, routine (e.g., monthly) sampling of the production stream permits compositional changes to be monitored and evaluated. Acknowledgments The authors thank ExxonMobil Upstream Research Co. for permission to publish this work. Productive discussions with Steve Hinton and Winston Robbins at ExxonMobil Corporate Strategic Research Co. are gratefully acknowledged. Constructive review of the manuscript by Paul Mankiewicz (EMURC; during the great Houston Flood of 2001) and additional discussions and insights were most helpful. W. Allen Young provided useful comments. Jan Herbst assisted in figure and manuscript preparation. The SPE Editorial Review Committee is acknowledged for their efforts and editorial suggestions that improved this paper. References
1. Ligthelm, D.J. et al.: Reservoir Souring: An Analytical Model for H2S Generation and Transportation in an Oil Reservoir Owing to Bacterial Activity, paper SPE 23141 presented at the 1991 SPE Offshore Europe Conference, Aberdeen, 36 September. 2. Sunde, E. et al.: Field-Related Mathematical Model To Predict and Reduce Reservoir Souring, paper SPE 25197 presented at the 1993 October 2002 SPE Reservoir Evaluation & Engineering
SPE International Symposium on Oilfield Chemistry, New Orleans, 25 March. 3. Khatib, Z.I. and Salanitro, J.P.: Reservoir Souring: Analysis of Surveys and Experience in Sour Waterfloods, paper SPE 38795 presented at the 1997 SPE Annual Technical Conference and Exhibition, San Antonio, Texas, 58 October. 4. Seto, C.J. and Beliveau, D.A.: Reservoir Souring in the Caroline Field, paper SPE 59778 presented at the 2000 SPE/CERI Gas Technology Symposium, Calgary, 35 April. 5. Winters, J.C. and Williams, J.A.: Microbiological alteration of crude oil in the reservoir, paper PETR86, E22 presented at the 1969 American Chemical Soc. Symposium on Petroleum Transform. in Geol. Envir., New York City, 712 September. 6. Milner, C.W.D., Rogers, M.A., and Evans, C.R.: Petroleum transformations in reservoirs, J. Geochem. Explor. (1977) 7, No. 2, 101. 7. Connan, J.: Biodegradation of crude oils in reservoirs, in Advances in Petroleum Geochemistry Volume 1, Brooks and Welte (eds.), Academic Press, London (1984) 299. 8. Palmer, S.E.: Effect of biodegradation and water washing on crude oil composition, in Organic Geochemistry, Engle and Macko (eds.), Plenum Press, New York City (1993) 511. 9. McKenna, E.J. and Kalio, R.E.: The biology of hydrocarbons, Ann. Rev. Microbiol. (1965) 19, 183. 10. Harwood, R.J.: Biodegradation of oil, in The Geology of Fluids and Organic Matter in Sediments, Natl. Conference on Earth Science, U. of Alberta, Edmonton (1973) 149. 11. Grassia, G.S. et al.: A systematic survey for thermophilic fermentive bacteria and archaea in high temperature petroleum reservoirs, FEMS Microbiol. Ecol. (1996) 21, No. 1, 47. 12. Chapelle, F.H. and Lovely, D.R.: Competitive exclusion of sulfate reduction by Fe (III)-reducing bacteria: A mechanism for producing discrete zones of high-iron ground water, Ground Water (1992) 30, No. 1, 29. 13. Stetter, K.O. et al.: Hyperthermophilic archaea are thriving in deep North Sea and Alaskan oil reservoirs, Nature (1993) 365, No. 6448, 743. 14. Reuter, P. et al.: Anaerobic oxidation of hydrocarbons in crude oil by new types of sulphate-reducing bacteria, Nature (1994) 372, No. 6505, 455. 15. Wilkes, H. et al.: Compositional changes of crude oils upon anaerobic degradation by sulphate reducing bacteria, in Organic Geochemistry: Developments and Applications to Energy, Climate, Environment and Human History, AIGOA, Donostia-San Sebastian, Spain (1995) 321. 16. Heider, J. et al.: Anaerobic bacterial metabolism of hydrocarbons, FEMS Microbiol. Review (1999) 22, No. 3, 459. 17. Zengler, K. et al.: Methane formation from long-chain alkanes by anaerobic micro-organisms, Nature (1999) 401, No. 6750, 226. 18. Bennett, S.C. and Hanor, J.S.: Dynamics of subsurface salt dissolution at the Welsh Dome, Louisiana Gulf Coast, in Dynamical Geology of Salt and Related Structures, Lerche and OBrien (eds.), Academic Press, New York City (1987) 653. 19. Wenger, L.M. et al.: Northern Gulf of Mexico: An integrated approach to source, maturation, and migration, in Geologic Aspects of Petroleum SystemsFirst Joint AAPG-AMPG Hedberg Research Conference, Schneidermann, Cruz, and Sanchez (eds.), Mexico City (1994). 20. Hood, K.C. et al.: Hydrocarbon system analysis of the northern Gulf of Mexico: Delineation of hydrocarbon migration pathways using seeps and seismic imaging, in Applications of Surface Exploration Methods for Exploration, Field Development, and Production, Schumacher and LeSchack (eds.), AAPG Studies in Geology No. 48, in press. 21. Peters, K.E. and Moldowan, J.M.: The Biomarker Guide, Prentice Hall, Englewood Cliffs, New Jersey (1993). 22. Meredith, W., Kelland, S.J., and Jones, D.M.: Influence of biodegradation on crude oil acidity and carboxylic acid composition, Org. Geochem. (2000) 31, No. 11, 1059. 23. Reinsel, M.A., Borkowski, J.J., and Sears, J.T.: Partition coefficients for acetic, propionic and butyric acids in a crude oil/water system, J. Chem. and Engineering Data (1994) 39, No. 3, 513.
24. Piehl, R.L.: Naphthenic corrosion in crude distillation units, Materials Performance (1988) 27, No. 1, 37. 25. Babaian-Kibala, E., Petersen, P.R., and Humphries, M.J.: Corrosion by naphthenic acids in crude oils, Preprints, American Chemical Soc., Div. of Petrol. Chem., Dallas (1998) 3, 106. 26. Babaian-Kibala, E. et al.: Naphthenic acid corrosion in a refinery setting, Materials Performance (1993) 32, No. 4, 50. 27. Turnbull, A., Slavcheva, E., and Shone, B.: Factors controlling naphthenic acid corrosion, Corrosion (1998) 54, No. 11, 922. 28. James, A.T. and Burns, B.J.: Microbial alteration of subsurface natural gas accumulations, AAPG Bull. (1984) 68, No. 8, 957. 29. Silverman, S.R.: Carbon isotopic evidence for the role of lipids in petroleum, J. Am. Oil Chem. Soc. (1967) 44, 691. 30. Price, L.C.: Aqueous solubility of petroleum as applied to its origin and primary migration, AAPG Bull. (1976) 60, No. 2, 213. 31. Price, L.C.: Primary petroleum migration by molecular solution consideration of new data, J. Petrol. Geol. (1981) 4, No. 1, 89. 32. Price, L.C. et al.: Solubility of crude oil in methane as a function of pressure and temperature, Org. Geochem. (1983) 4, Nos. 34, 201. 33. Thompson, K.F.M.: Classification and thermal history of petroleum based on light hydrocarbons, Geochim. Cosmochim. Acta (1983) 47, No. 2, 303. 34. Yu, A.Z. et al.: How to predict biodegradation risk and reservoir fluid quality, World Oil (April 2002) 63. 35. Wenger, L.M. and Isaksen, G.H.: Control of hydrocarbon seepage intensity on level of biodegradation in sea bottom sediments, in Advances in Organic Geochemistry 2001, Landais and Michels (eds.), Elsevier, in press. 36. Dore, A.G. (ed.): Basin Modelling: Advances and Applications, Norwegian Petroleum Society Special Publication No. 3, Elsevier, Amsterdam (1993).
SI Metric Conversion Factors API 41.5/(131.5+API) bbl 1.589 873 E01 ft 3.048* E01 F (F32)/1.8
*Conversion factor is exact.
g/cm3 m3 m C
Lloyd M. Wenger is a petroleum geochemist with ExxonMobil Upstream Research Co. His work focus has been on the application of geochemical technologies to exploration, development, and production problems and linkage to downstream organizations for early recognition of value and handling/ processing issues. After many years of working in the Gulf Coast and the Gulf of Mexico, he has worked primarily in west Africa, including Nigeria and Congo, and he is currently involved in development and exploration activities in deepwater Angola. Wenger holds a PhD degree in organic geochemistry from Rice U. Cara L. Davis has been with ExxonMobil Upstream Research for 5 years, focusing on oil quality and reservoir geochemistry research and applications. She holds a PhD degree in geology (specializing in organic geochemistry) from Indiana U. Gary H. Isaksen is Research Supervisor for Petroleum Geochemistry with ExxonMobil Upstream Research Co. Since joining Exxon in 1985, the major themes of his work have been integration of geology and petroleum geochemistry, molecular geochemistry, play-element risking, and applications of geochemistry to field development and production. From 1993 to 1995, he worked frontier and established plays within U.K. and Norwegian acreage, and from 1997 to 1999, he worked regional- and prospect-scale assessments within Azerbaijan, Turkmenistan, Uzbekistan, and Russia. His current geoscience focus is on applied research to solve exploration, development, and production problems. Isaksen holds a PhD degree in petroleum geochemistry and petroleum geology from the U. of Bergen, Norway.
Petroleum Reservoir
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text:
Parents find son snatched in hotel 32 yrs ago
China abductions: Parents find son snatched in hotel 32 years ago
By Still Waters, May 19, 2020 in Other World News
mao yin
li jingzhi
Still Waters 51,013
Deeply Mysterious
"Sometimes you will never know the value of a moment, until it becomes a memory." - Dr. Seuss
A Chinese couple whose son was abducted in a hotel in 1988 have been reunited with him after 32 years.
Mao Yin was snatched aged two, while his father stopped to get him some water on the way home from nursery.
His parents searched the country for him and his mother distributed more than 100,000 flyers.
The family were reunited at a police news conference on Monday, and the son - now aged 34 - said he planned to spend time with his parents.
"I would like to thank the tens of thousands of people who helped us," said Li Jingzhi, the boy's mother.
https://www.bbc.co.uk/news/world-asia-china-52717670
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text:
St. Olaf College is a private liberal arts college in Northfield, Minnesota. It was founded in 1874 by a group of Norwegian-American pastors and farmers led by Pastor Bernt Julius Muus. The college is named after the King and the Patron Saint Olaf II of Norway and is affiliated with the Evangelical Lutheran Church in America. It was visited by King Olav in 1987 and King Harald V and Queen Sonja of Norway in 2011. Queen Sonja of Norway visited the college's campus a second time in 2022 as part of a tour to celebrate the connections between Norway and Minnesota's Norwegian-American community. She participated in a ribbon-cutting ceremony for the Special Collections vault at Rølvaag Memorial Library.

As of 2017, the college enrolled 3,035 undergraduate students and 256 faculty. The campus, including its 325-acre natural lands, lies 2 miles west of the city of Northfield, Minnesota; Northfield is also the home of its neighbor and friendly rival Carleton College. Between 1995 and 2020, 154 St. Olaf graduates were named Fulbright Scholars and 35 received Goldwater Scholarships. Of the nation's baccalaureate colleges, St. Olaf ranks 12th in the number of graduates who have gone on to earn doctorate degrees.

History

Seal and motto
The seal of the St. Olaf College displays the Coat of arms of Norway, which includes the axe of St. Olaf.

The motto Fram! Fram! Kristmenn, Krossmenn, written in New Norwegian, is adapted from the Old Norse battle cry of King Olaf. It means "Forward! Forward! Men of Christ, Men of the Cross".

Founding

Many Norwegian immigrants arrived in Rice County, Minnesota, and the surrounding area in the late 19th century. Nearly all were Lutheran Christians, and desired a non-secular post-secondary institution in the Lutheran tradition that offered classes in all subjects in both Norwegian and English. The catalyst for St. Olaf's founding was the Reverend Bernt Julius Muus; he sought out the help of the Revs. N. A. Quammen and H. Thorson. Together they petitioned their parishes and others to raise money to buy a plot of land on which to build the new institution. The three received around $10,000 in pledges, formed a corporation and bought land and four buildings (old Northfield schoolhouses) for the school. Muus came under scrutiny after a divorce case revealed extensive acts of domestic abuse. He fell out of favor with many of his predecessors, but the school did not officially denounce his abuses.

St. Olaf's School opened on January 8, 1875, at its first site under the leadership of its first president, Thorbjorn N. Mohn, a graduate of Luther College. Herman Amberg Preus, president of the Norwegian Synod, laid the foundation stone of the St. Olaf School on July 4, 1877. In 1887 the Manitou Messenger was founded as a campus magazine and has since evolved into the college's student newspaper, now called the Olaf Messenger. 1887 was also the year that the first female St. Olaf graduate, Agnes Mellby, joined the college. Mellby graduated in 1893. She was the first woman to graduate from a Norwegian Lutheran college in the United States.

In 1932, Red Wing Lutheran Seminary was merged into St. Olaf and its Red Wing campus was closed. The Seminary was an independent academic institution from 1879 to 1932.

Financial crisis
In 1893, St. Olaf faced severe economic difficulties. A national economic depression caused enrollment to drop from a high of 147 in 1892 to 129 in 1893. Also in 1893 the Norwegian Synod voted to cut ties with the college, greatly reducing its income. By the August 1893 board meeting, the college was $10,000 in debt. On August 2 the Board of Trustees appointed professor H. T. Ytterboe to travel around the Midwest and collect funds for the college. During this time President Mohn took over Ytterboe's responsibilities managing the college's finances. Over the next six years faculty and staff saw their salaries reduced, and the number of teaching faculty was reduced from eleven to seven. Ytterboe spent six years traveling the Midwest and was highly effective at fundraising, averaging $6,500 per year, mostly in small donations of a dollar or more from farmers and private individuals. By 1897, when the synod reinstated the college, the debt was reduced to less than $4,000. Historians of the college widely regard Ytterboe's and Mohn's efforts as having saved the college from extinction.

Scarlet fever epidemic
Following students' return from Christmas vacation in 1903, an epidemic of scarlet fever broke out on the campus and quickly spread. Twenty-eight out of St. Olaf's approximately three hundred students came down with the highly infectious disease. With no local hospital, the north wing on the third floor of Ytterboe Hall, the boys dormitory, was used as a makeshift hospital and staffed with two nurses who worked tirelessly to contain the spread of the disease.

1918 Spanish flu pandemic
At the beginning of the spread of the Spanish flu to the United States, St. Olaf went into voluntary quarantine in hopes of avoiding the epidemic, allowing students to leave campus only for emergencies once they had obtained a pass. The first cases on St. Olaf's campus occurred on November 11, 1918, and shortly thereafter the college hospital was filled to capacity. Ytterboe Hall was converted into a hospital for the sick once the temporary beds in Hoyme Chapel had filled. St. Olaf officially closed for the year on December 7, due to a rapid rise of influenza cases. Four students died from flu complications.

St. Olaf during the Second World War
At the beginning of World War II, St. Olaf was not directly involved with the conflict, with the extent of wartime activities including Red Cross drives and a "Bundles for Britain" project. But by the fall of 1942, over 400 undergraduates and alumni were serving overseas. The campus was also ordered to house 600 U.S. Naval recruits for flight training, leading to the conversion of Mohn and Ytterboe Halls from women's dormitories to housing for naval servicemen. Students living in Ytterboe and Mohn Halls were required to move to Agnes Mellby Hall to accommodate the naval personnel.

Presidents
St. Olaf has had 11 presidents since its founding with a 12th scheduled to take office in June of 2023:
 Thorbjorn N. Mohn, 1874–99
 John N. Kildahl, 1899–1914
 Lauritz A. Vigness, 1914–18
 Lars W. Boe, 1918–42
 Clemens M. Granskou, 1943–63
 Sidney A. Rand, 1963–80
 Harlan F. Foss, Ph.D., 1980–85
 Melvin D. George, Ph.D., 1985–94
 Mark U. Edwards Jr., Ph.D., 1994–2000
 Christopher M. Thomforde, D.Min., 2001–06
 David R. Anderson, Ph.D., 2006 to

Church affiliations

 1874–87 Norwegian Synod
 1887–90 Anti-Missourian Brotherhood
 1890–1917 United Norwegian Lutheran Church of America
 1917–60 Evangelical Lutheran Church
 1960–87 The American Lutheran Church
 1988–present Evangelical Lutheran Church in America

Campus

Known as "The Hill", St. Olaf College's picturesque  campus is home to 17 academic and administrative buildings, 29 student residences and 10 athletic facilities. St. Olaf is a residential college; 96% of St. Olaf students reside in one of the 11 residence halls and 18 academic and special interest group houses. Adjacent to campus are  of restored wetlands, woodlands, and native tall grass prairie owned and maintained by St. Olaf, and a utility-grade wind turbine that supplies up to one-third of the college's electrical needs.

Two buildings on the campus are listed on the National Register of Historic Places: Old Main, designed by Long and Haglin; and Steensland Library, designed by Omeyer and Thori. In 2011, Travel+Leisure named St. Olaf one of the most beautiful college campuses in the United States.

Edward Sövik, a liturgical architect and St. Olaf professor of art until his death in 2014, designed or assisted in the design of 20 campus buildings.

Notable buildings

Center for Art and Dance
The Center for Art and Dance is a collaborative project with offerings from the art, art history, and dance departments. It houses the Flaten Art Museum and studio spaces dedicated to painting, drawing, printmaking, ceramics, wood sculpture, digital media, photography, and a metal foundry, all named after alumni and educators who contributed to the development of each discipline. The Flaten Art Museum was founded as the Steensland Art Gallery in 1976. In 2002, it was moved to the Center for Art and Dance and renamed to honor Arnold Flaten, a past professor of art, and his family. The museum has a collection of regional, national, and international works and exhibits these as well as faculty and student work.

The building underwent significant remodeling in the early 2000s and was initially dedicated as the Dittmann Complex, honoring Reidar Dittmann. Dittmann was born in Norway in 1922, and spent the better part of his youth working with the Norwegian resistance against the rising Nazi regime until his imprisonment in the Buchenwald concentration camp. After his immigration to the United States, Dittmann joined St. Olaf's faculty as a professor of art and Norwegian in 1947. In 1952 He and Ansgar Sovik co-founded the International Studies program, now known as the Office of International and Off-Campus Studies. After his death in 2010, serious sexual assault allegations from St. Olaf alumni surfaced under the revisions of Title IX Policy concerning Dittmann and other faculty members. The decision to rename the building was made in 2017, following the pattern of campuses around the country questioning the names of buildings dedicated to notable alumni with contentious histories.

Agnes Mellby Hall
Mellby Hall was constructed in 1938 to meet the needs of the growing female student population overflowing from Ladies' Hall, the first female dormitory competed in 1879, and Mohn Hall, completed in 1912. The building is dedicated to 1893 alumna Agnes Theodora Mellby, the first woman to graduate from St. Olaf. Born in Christiania, Norway in 1870, Mellby immigrated with her family to the U.S. in 1871 and settled in New Richland, Minnesota. After finishing her Academy (1891) and College (1893) studies at St. Olaf, she returned as the Dean of Women and an educator that fall, affectionately known as the Preceptress by those she worked with. Mellby taught English, German, geography, U. S. History, civics, and math, firm in her resolve to see to the well-being of St. Olaf's female population regarding education and housing. She held her position from 1893 until 1909, and continued to work with the college after retiring until her death in 1918.

Agnes Kittelsby Hall
In 1956, Agnes Kittelsby Hall was constructed with rooms for 164 women as an adjacent wing to the Gertrude Hilleboe Hall. It was an all-women's dormitory until St. Olaf residence halls became co-ed. The building is named after Agnes Kittelsby, St. Olaf class of 1900. Like many St. Olaf alumnae, Kittelsby taught various subjects at the college after her graduation. In 1914, she moved to China and established American School Kikungshan, a school for the children of American missionaries.

Thorson Hall
Thorson Hall was constructed as a men's dormitory in 1948. It was one of four dormitories constructed in the 1940s and 1950s to address an increase in enrollment after World War II. The building is named after Harald Thorson (1841-1920), an early benefactor of the college. A businessman, Thorson owned farms, sold horses and mules, and established banks. He was instrumental in establishing St. Olaf's School (as it was first named), choosing the initial 30-acre plot of land and authorizing the first payment for it. He later served as a member of the original Board of Trustees. Thorson's will bequeathed most of his estate to St. Olaf under the stipulation that the money be used for the construction of a new building, Thorson Hall.

Academics

Curriculum
Before graduating, St. Olaf students complete 15-18 required courses in general education credits, including courses in writing, a foreign language, society, religion, ethics, mathematical reasoning, race, social science, and natural science. Many of the courses are interdisciplinary. St. Olaf offers 41 different majors for the bachelor of arts degree, five for the bachelor of music degree, and 20 areas of concentration, which are pursued independently of majors. Its most popular majors, based on 2021 graduates, were:
Biology/Biological Sciences (83)
Economics (64)
Research and Experimental Psychology (57)
Mathematics (34)
English Language and Literature (33)
Political Science and Government (33)

As of the 2020–21 academic year, the student-to-faculty ratio is 12.2 to 1.

The Paracollege lasted for 31 years, from 1969 to 2000, and was an individualized, interdisciplinary option for obtaining the Bachelor of Arts degree. The Paracollege program emphasized student-centered education through workshops, colloquia, tutorials, seminars, and senior concentrations. It was replaced by the Center for Integrative Studies, which allows students to design individual majors.

Admissions
According to the St. Olaf College Common Dataset for the class of 2024, St. Olaf received 5,229 applications, accepted 2,656 (50.8%), and enrolled 727. The middle 50% range of SAT Composite scores for the class of 2024 was 1160–1370, while the ACT Composite range was 25–32. Of the 37% of enrolled first-year students who submitted high school class rank, 39% were in the top tenth of their high school classes and 69% ranked in the top quarter. The average high school GPA was 3.68.

Rankings

The 2022 annual ranking by U.S. News & World Report rates St. Olaf tied for 62nd among 223 "National Liberal Arts Colleges", 29th among 100 "Best Value Schools", and tied at 27th for "Best Undergraduate Teaching" among 75 ranked liberal arts colleges.

Forbes in 2019 rated St. Olaf 116th overall in its America's Top Colleges ranking of 650 military academies, national universities, and liberal arts colleges, and 50th among liberal arts colleges.

Washington Monthly ranked St. Olaf 28th in 2022 among 203 liberal arts colleges in the U.S. based on its contribution to the public good, as measured by social mobility, research, and promoting public service.

St. Olaf was ranked 47th for liberal arts colleges on Payscale.com's 2016-17 list of highest-paid graduates.

Student life

Student organizations
More than 250 student organizations are registered at St. Olaf, including academic, athletic, awareness, multicultural, political, religious, service (Alpha Phi Omega) and other special interest groups. Club sports include rowing, men's and women's Ultimate Frisbee, men's and women's rugby, men's and women's lacrosse, badminton, cycling, judo, and fencing. KSTO 93.1 FM is the student-operated radio station and the Olaf Messenger (formerly known as the Manitou Messenger) is the student newspaper. The paper changed its name in 2020 in response to concerns of the appropriation of the word "Manitou" from the language of the original inhabitants of the land the college is built on. Other groups include an on-campus organic farm (STOGROW), an improv comedy troupe (Scared Scriptless), and an EMT (emergency medical technician) organization that is the first responder for campus emergencies. St. Olaf students edit and publish several journals each year, including The Reed, the world's only international undergraduate journal for existential philosophy.

Student government
St. Olaf's Student Government Association (SGA) finances many student activities and organizations on campus. It operates through 10 branches, each managed by an elected executive: Diversity Celebrations Committee, Volunteer Network, Music Entertainment Committee, Student Activities Committee, Student Organizations Committee, Board of Regents Student Committee, The Pause, After Dark Committee, and Political Awareness Committee. Besides these committees, students can serve in the Student Senate to vote on issues such as constitutional bylaws changes and dorm capital improvement funds and communicate with college administrators about campus issues. SGA also maintains Oleville.com, a website containing information about student activities.

Student protests

Ytterboe the Dog
Ytterboe, named after former professor H. T. Ytterboe, was a black dog who became a facet of campus life at St. Olaf in 1942. Fed and cared for by students, the dog became an unofficial mascot. In 1957, Ytterboe the Dog "allegedly" bit the son of a local police officer Peter Morris. In response, Morris sent two officers to St. Olaf's campus to capture the dog. After he evaded capture, police shot Ytterboe on the library hill, in front of students who were studying for finals. In response, St. Olaf and Carleton students protested, gaining local and national coverage. At the protests, an effigy of the officer who shot Ytterboe was hung from a streetlight and burned. The Minnesota highway patrol was called in to control the protest as students continued demonstrating in Northfield. In response to the protests, the chief of police said, "Nobody loves a dog more than I do. We didn't mean to kill him". St. Olaf President Clemens M. Granskou commented, "As far as I could see, this is one of these tempests in a teacup that usually take place once in a while in the springtime on a college campus".

Initially, the Northfield Police sent Ytterboe's body to a local landfill, but students retrieved it. Afterward, Ytterboe's head was sent to Minneapolis to be tested for rabies; it tested negative. His body was buried on a slope of Manitou Heights the day after he was shot as a crowd of 2,000 students and members of the community gathered to pay their respects.

ROTC
Between 50 and 75 students from St. Olaf, accompanied by some Carleton students, occupied the St. Olaf administration building on April 16, 1970, demanding that the school cut ties with the ROTC. Students occupied the building until Friday afternoon, ending their occupation when President Sidney Rand came to an agreement with the leaders of the protest. The school moved forward on votes within the administration and the board of regents in return for the cessation of "obstructive demonstration". The St. Olaf protests coincided with a similar occupation at Macalester College.

Sexual misconduct
In 2016, students protested the school's policies on sexual harassment through a T-shirt campaign. Students donned grey shirts reading "Ask me how my college is protecting my rapist" to draw attention to the school's sexual misconduct policies. Information about the campaign circulated through social media and was soon picked up by local news sources. In response, the Office of Civil Rights of the U.S. Education Department launched an investigation into the college's policies. Soon after, the school officially announced an overhaul of its Title IX policies.

Racism
In 2017, a series of notes containing threats and racial slurs appeared. In response, students protested for systemic changes within the school on issues like diversity and inclusion, cultural sensitivity, and hate crimes. As of May 1, 2017, there had been 9 reported acts of hate speech during the school year. By occupying campus buildings, blocking entrances to the cafeteria, and boycotting classes, demonstrators pushed the administration to act on a number of demands. While the protests prompted the administration to reevaluate its policies, an investigation revealed that one of the notes was forged. While the forgery undermined the movement for some, others saw it as a rogue action that did not detract from the progress made.

Climate
In 2019, St. Olaf students joined over four million people worldwide who participated in the September 2019 climate strikes, a continuation of the school strike for climate movement inspired by Swedish climate activist Greta Thunberg. On September 20, hundreds of St. Olaf students walked out of class and marched into downtown Northfield, where they joined other Northfield citizens to raise awareness of the growing threat of global climate change. The St. Olaf strike was organized by the college's Climate Justice Collective (CJC), a group dedicated to increasing campus awareness of climate issues and pushing St. Olaf to divest its endowment from fossil fuel companies.

Music program

St. Olaf's music program was founded by F. Melius Christiansen in 1903. Its band, choir and orchestra tour the continental United States annually and have made many international tours, typically occurring triennially. The St. Olaf Band, currently under the direction of Timothy Mahr '78, was the first American college musical organization to conduct a concert tour abroad when it traveled to Norway in 1906.

The St. Olaf Orchestra was conducted for 40 years by Steven Amundson. Under his direction, the orchestra performed Mahler's Symphony No. 2 (Resurrection), Stravinsky's Petrouchka and Rite of Spring, Ravel's La valse, and tone poems by Richard Strauss. As of 2022, the conductor is Chung Park.

The St. Olaf Choir, conducted by Anton Armstrong '78, was founded by Christiansen in 1907 as the St. John's Lutheran Church Choir in Northfield, a collegiate ensemble. It has toured Europe several times, as well as China, Korea, and Australia, performing before heads of state and producing more than a dozen recordings. The choir performs in the nationally broadcast annual St. Olaf Christmas Festival, along with the St. Olaf Orchestra and four of the college's other choirs. In 2005 the choir was invited to perform at the White House for President George W. Bush, First Lady Laura Bush, and guests to commemorate the National Day of Prayer.

The St. Olaf Jazz I ensemble was awarded the DownBeat magazine award for top undergraduate large ensemble in 2011. Led by St. Olaf music faculty member Dave Hagedorn, the ensemble toured Cuba during March 20–25, 2016.

Other student musical ensembles include The St. Olaf Handbell Choir, Chapel Choir, Cantorei, Manitou Singers, Viking Chorus, Collegiate Chorale, Philharmonia, Norseman Band, and many smaller vocal and instrumental ensembles. There are also student-run music ensembles at St. Olaf: Valhalla Band, Naknefeler Orchestra, and the men's and women's a cappella groups: The Limestones, Agnes, and Krossmen. In addition, the Gospel Choir of St. Olaf is one of few Midwest college gospel choirs. These groups are not a part of the college's music program and operate independently.

In 2005 the St. Olaf Band, St. Olaf Orchestra, and St. Olaf Choir toured Norway to celebrate its independence centennial.

Ensembles that were founded at St. Olaf include the Minnesota Symphonic Winds, the Metropolitan Symphony Orchestra, the Copper Street Brass and the a cappella choral groups Cantus, Inpulse, and Magnum Chorum.

St. Olaf is also the location of the sacred choral music radio show Sing for Joy.

Athletics

St. Olaf's athletic teams are called the Oles. Their colors are black and gold. The college is a member of the NCAA Division III level of the National Collegiate Athletic Association (NCAA), primarily competing in the Minnesota Intercollegiate Athletic Conference (MIAC) in most sports since the 1974–75 academic year (of which it was also a member from 1920–21 to 1949–50), while its Alpine and Nordic skiing teams compete as Independents. The Oles competed in the Midwest Collegiate Athletic Conference (MCAC, known as the Midwest Conference since 1994–95) from 1952–53 to 1973–74.

St. Olaf competes in 26 intercollegiate varsity sports (13 for men and 13 for women). Men's sports include baseball, basketball, cross country, football, golf, hockey, skiing (Nordic and Alpine), soccer, swimming & diving, tennis, and track & field (indoor and outdoor); women's sports include basketball, cross country, golf, ice hockey, skiing (Nordic and Alpine), soccer, softball, swimming & diving, tennis, track & field (indoor and outdoor), and volleyball. Former sports included men's wrestling.

St. Olaf also has many student-coached club and intramural teams that compete within the student body and also inter-college. Notable are the St. Olaf Ultimate teams, The Berzerkers and Durga (team name changed to Vortex in 2015), which make an annual trip to a national collegiate tournament (Spring Ultimax) in North Carolina. The women's Ultimate teams have been successful at the national level for many years. In 2011, Durga played at the Division III Nationals tournament in Buffalo, New York, finishing in seventh place. The team also played in the DIII Nationals tournament in 2014. In 2017, Vortex again qualified for the national tournament in Kentucky and placed seventh. In 2018, Vortex won the DIII national championship in Rockford, Illinois. After that success, Vortex placed third at the DIII National tournament in College Station, Texas. The St. Olaf Dance Team supports St. Olaf athletic teams (football, men's/women's soccer and basketball) with halftime performances and competes in intercollegiate events every year. It has performed in the Minnesota Swarm lacrosse team's halftime show and placed third in its division at the 2011 St. Thomas Invitational.

Rivalry with Carleton College

Football

St. Olaf is a traditional athletic rival of its crosstown neighbor Carleton College. The annual American football game between the Knights and the Oles was recently dubbed the "Cereal Bowl" in honor of the Malt-O-Meal production facility in Northfield. The annual winner receives the "Goat Trophy", which was created by Minneapolis dentist Ranthus B. Fouch in 1931.

The rivalry between St. Olaf and Carleton began with a Carleton victory over St. Olaf in 1919. A statue of an eagle in Northfield's Civil War Veterans' Memorial (in Bridge Square) is turned to face the college that wins the annual match between the schools.

These football teams are also significant for having played the only NCAA-sanctioned "Liter Bowl" metric football game in history, which St. Olaf won in 1977.

Cross country
The Great Karhu Shoe Race is an annual rivalry between the cross country teams of Carleton and St. Olaf College.  The race was founded in 1972 when Carleton Coach Bill Huyck was in search of a new championship course for the Midwest Conference Meet. St. Olaf coach Bill Thornton agreed to a competition between the runners on each team who were not on the varsity top 7. The varsity athletes were still racing later in the season. The trophy for the 1972 race was a pair of Karhu Shoes worth $10. These shoes have remained the trophy to this day.

Several traditions exist between the St. Olaf and Carleton runners at the race. As the race typically falls near Halloween, many of the runners will often don costumes. The runners for the St. Olaf men use safety pins to attach gummy bears to their shorts, which the Carleton runners attempt to rip off.

Kierkegaard Library
The Howard V. and Edna H. Hong Kierkegaard Library is a research collection dedicated to the work of the 19th-century Danish philosopher and theologian Søren Kierkegaard (1813–1855), housed at St. Olaf College, Northfield, Minnesota. Along with the Søren Kierkegaard Research Center at the University of Copenhagen, Denmark, it is one of two internationally significant research facilities devoted to the study of Kierkegaard. The collection began as the private library of Howard V. Hong and Edna H. Hong, assembled during their complete translation of Kierkegaard's writings into English, the first volume of which received the National Book Award. Subsequent curators of the library were philosophers C. Stephen Evans and, from 1995 to 2022, Gordon D. Marino.

The Hongs donated the collection to St. Olaf College in 1976 with the understanding that it be made available as a center for research and publication. The library's current holdings include over 11,000 volumes, 3,500 periodical articles and a partial replication of Kierkegaard's personal library as well as titles Kierkegaard might have had access to during his lifetime. It hosts visiting researchers throughout the year (including an active summer fellows program) and periodic conferences and research seminars. Activities in the summer include Danish courses and an International Conference every fourth year. Yearlong Kierkegaard Fellowships see scholars living in St. Olaf's Kierkegaard House. The library's director is St. Olaf College philosophy faculty member Anna Louise Strelis Söderquist.

St. Olaf students edit and publish The Reed, an undergraduate journal of existential philosophy, from the library. The Reed began in 1998, and since then has published articles from undergraduates across the globe every year.

Flaten Art Museum
St. Olaf is home to the Flaten Art Museum, in the Center for Art and Dance. The museum holds over 4,000 works on rotating display to the public. The vast majority of the works were received through donations, but a few were purchased. The museum also displays senior studio majors' work at the end of the year to give them experience in having artwork displayed in a professional setting.

Poster collection
In 2015 St. Olaf accepted a collection of 147 rare World War II-era propaganda posters as part of a donation from the estate of Richard N. Tetlie. The posters were created by the Nazi regime and the Vichy French government for display across occupied Europe and were collected by Major Duncan Emrich, historian for General Dwight D. Eisenhower, during the liberation of Europe. The collection provides insight into how the Nazis and their allies attempted to foster racial ideology, encourage distrust of the Allies, and rally support for their cause by manipulating the fear, anxiety, traditions, and political circumstances of the people in the occupied territories. The museum contacted the Midwest Art Conservation Center for a full assessment of the collection in hopes that the posters can be restored. They could then be used in exhibits and as resources to teach about the dangers of propaganda and extremism.

Notable alumni

Notable St. Olaf alumni include civil rights activist James Reeb '50, AIA Gold Award-winning architect Edward Sövik '39, Minnesota Governor Al Quie '50, Oscar-winning screenwriter Barry Morrow '70, Pulitzer Prize-winning journalist Gretchen Morgenson '76, and writers Ole Rolvaag 1905, Siri Hustvedt '77 (winner of the Princess of Asturias Award in Letters), ornithologist Margaret Sordahl, and Traci Lambrecht '89 (of P.J. Tracy). Game designer Jonathan Tweet studied at the college, as did the first female major league baseball coach, Justine Siegal. Raffi Freedman-Gurspan graduated in 2009 with a Bachelor of Arts in political science and Norwegian. Andrew Volstead 1881 introduced the National Prohibition Act to Congress in 1919. Cheryl Willman is an American cancer researcher and the executive director of Mayo Clinic Cancer Programs.

Ernest Lawrence, recipient of the 1939 Nobel Prize in Physics, studied for a year at St. Olaf.

In popular culture
St. Olaf is mentioned in the works of Minnesota author F. Scott Fitzgerald, whose character Jay Gatsby of The Great Gatsby attended the college briefly and worked as a janitor. The college is also frequently mentioned in Garrison Keillor's radio program A Prairie Home Companion, which broadcast its show from St. Olaf on November 17, 2001, and November 19, 2011.

The fictional Minnesota city of St. Olaf was the hometown of Rose Nylund in the TV show The Golden Girls. In the TV show the fictional city's sister city was St. Gustav, Minnesota, a nod to Gustavus Adolphus College, in nearby St. Peter, Minnesota. Betty White, the actress who played Rose, visited St. Olaf and was given an honorary membership in St. Olaf's chapter of the theater honorary society.

The St. Olaf Choir can be heard performing Mozart's Requiem with the St. Paul Chamber Orchestra in Nike's "Jordan XXII-Takeover" commercial. The choir is also on the soundtrack of the 1972 film The Great Northfield Minnesota Raid.

In October 2008 the Coen Brothers shot scenes at St. Olaf for their film A Serious Man. After a long search of many campuses, they chose St. Olaf's old Science Center because it had the late 1960s look of the movie. St. Olaf has since built a new science center and remodeled the old facility into Tomson Hall.

See also
 List of St. Olaf College people
 List of colleges and universities in Minnesota
 Higher education in Minnesota

Notes

References

External links

 Official athletics website

Liberal arts colleges in Minnesota
Universities and colleges affiliated with the Evangelical Lutheran Church in America
Education in Rice County, Minnesota
Educational institutions established in 1874
University and college buildings on the National Register of Historic Places in Minnesota
Buildings and structures in Rice County, Minnesota
Tourist attractions in Rice County, Minnesota
Northfield, Minnesota
Private universities and colleges in Minnesota
1874 establishments in Minnesota
National Register of Historic Places in Rice County, Minnesota

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text:
Gisburg (born in 1966 as Gisburg Smialek) is an Austrian Composer, Singer and Music Editor for Film.

Biography

Gisburg born in Salzburg/ Austria. She began studying modern music theater with Dieter Schnebel and was touring around the world as a concert singer with his vocal group Die Maulwerker. She attended the Berlin University as a guest student for composition and modern music theatre with Prof. Dieter Schnebel and Prof. Witold Szalonek and for visual arts with Eva Maria Schön. She moved to New York City in 1992 and performed around the Knitting factory and Roulette scene. She recorded albums for Tzadik. and GP music. She was a member of the Chinese Hai-Tien choir with Mrs. Pi-Chu Hsiao for 6 years, and recorded with Gary Lucas Chinese pop music of the 1930s and 1950s.

She scored several music scores for films  and works as a music editor in NYC.

Besides this she is the co-founder of the Filmette Film Festival , with Drew Pisarra and Loui Terrier. Filmette is a Film Festival which champions films outside the usual Festival time constraints.

References

1966 births
Living people
Musicians from Salzburg
20th-century Austrian women singers
Austrian women composers
Tzadik Records artists