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Estimate the total reservoir compressibility for a sandstone formation that is characterized by a porosity of 25%. The reservoir is undersaturated (i.e., no initial gas cap is present) and the oil and water saturations are 70 and 30%, respectively.stimate the total reservoir compressibility for a sandstone formation that is characterized by a porosity of 25%. The reservoir is undersaturated (i.e., no initial gas cap is present) and the oil and water saturations are 70 and 30%, respectively.
It's extremely unusual to find sandstone that has forced its way into granite, making the Colorado formation a rare find, Siddoway said. Intrusions of sedimentary rock into granite-type rock speak of a catastrophic event, she said, such as an earthquake or flood. An earthquake can cause sediment to liquefy, as it did during the 6.0-magnitude earthquake that hit Christchurch, New Zealand, in 2011.