density) cross-plot in the wells in the study area. The petrophysical characteristics, because they are used for value of shale content ranges from 9% in Ja28-1 well, more accurate evaluation in the individual wells and in 17% in Ja27-3ST well. It indicates the probability of comparison between the different wells. The presence of hydrocarbon sub-reservoir intervals as the cross-plots are presented to give complete mean value is 52 %, while the value of effective vision about the lithological analysis (shale volume porosity ranges from 17% in Ja27-3ST to 26% in and matrix), effective porosity and the internal It indicates the probability of presence of resolution of the available water and hydrocarbon hydrocarbon sub-reservoir intervals as the mean value saturations. is 49-63%. 4.2.1 Lateral Variation of Petrophysical 4.2 Illustration of Results Characteristics Petrophysical characteristics that are deduced A number of iso-parametric maps, which are the from the process of well-log analysis are generally net pay, shale content, effective porosity, water varied vertically and laterally. The lateral variation of saturation, and hydrocarbon saturation maps, represent petrophysical characteristics in the area under the lateral variation of petrophysical characteristics. investigation could be studied through a number of 4.2.1.1 Khatatba Formation Combined gradient and saturation maps (iso-parametric maps); Petrophysical Parameters that include, net pay (m), shale content (Vsh %), Fig. (15) illustrates the combined petrophysical effective porosity (Øeff %), water saturation (Sw %), characteristics of Khatatba Formation. This figure and hydrocarbon saturation (Shr %) to complete the shows that the net pay thickness of Khatatba increases vision of hydrocarbon potentialities in the study area. towards the northeastern parts of the study area, while The vertical distribution of the petrophysical the effective porosity increases towards the north characteristics have been performed through the eastern parts of the study area. The water saturation cross-plots by the software program decreases towards the northeastern parts of the study technique. Litho-saturation cross-plots are considered area, while the shale content decreases gradually to the as an important vertical representation for northeastern direction of the study area.
density) cross-plot in the wells in the study area. The value of shale content ranges from 9% in Ja28-1 well, 17% in Ja27-3ST well. It indicates the probability of presence of hydrocarbon sub-reservoir intervals as the mean value is 52 %, while the value of effective porosity ranges from 17% in Ja27-3ST to 26% in It indicates the probability of presence of hydrocarbon sub-reservoir intervals as the mean value is 49-63%. 4.2 Illustration of Results Petrophysical characteristics that are deduced from the process of well-log analysis are generally varied vertically and laterally. The lateral variation of petrophysical characteristics in the area under investigation could be studied through a number of gradient and saturation maps (iso-parametric maps); that include, net pay (m), shale content (Vsh %), effective porosity (Øeff %), water saturation (Sw %), and hydrocarbon saturation (Shr %) to complete the vision of hydrocarbon potentialities in the study area. The vertical distribution of the petrophysical characteristics have been performed through the cross-plots by the software program technique. Litho-saturation cross-plots are considered as an important vertical representation for petrophysical characteristics, because they are used for more accurate evaluation in the individual wells and in comparison between the different wells. The cross-plots are presented to give complete vision about the lithological analysis (shale volume and matrix), effective porosity and the internal resolution of the available water and hydrocarbon saturations. 4.2.1 Lateral Variation of Petrophysical Characteristics A number of iso-parametric maps, which are the net pay, shale content, effective porosity, water saturation, and hydrocarbon saturation maps, represent the lateral variation of petrophysical characteristics. 4.2.1.1 Khatatba Formation Combined Petrophysical Parameters Fig. (15) illustrates the combined petrophysical characteristics of Khatatba Formation. This figure shows that the net pay thickness of Khatatba increases towards the northeastern parts of the study area, while the effective porosity increases towards the north eastern parts of the study area. The water saturation decreases towards the northeastern parts of the study area, while the shale content decreases gradually to the northeastern direction of the study area.
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