| Popis: |
Petrophysical evaluation of the lower Bahariya sediments was performed based on comprehensive interpretation of complete wireline logs suite from two wells in Salam oil field, southwest Shushan basin in the north Western Desert, Egypt. Several petrophysical parameters such as shale volume (VSH), total and effective porosities (PHIT, PHIE), water saturation (SW) and hydrocarbon saturation (SH) were deduced and utilized in the petrophysical subdivision of the lower Bahariya sediments. Neutron versus density, matrix volumetric versus matrix grain density and M-N crossplots revealed that quartzose sandstone is the dominant matrix component within the lower Bahariya sediments. Additionally, the litho-saturation crossplots typified the presence of oil-bearing intervals often associated with the quartzose sandstones with minimal contents of silts and clays. Dispersed and laminated clays are detrimental to the reservoir quality by obstructing the pore spaces and thus reducing the hydrocarbon flow storage and flow capacities. The obtained petrophysical results reveal that the lower Bahariya sediments have a good reservoir quality with high effective porosity values exceeding 18% and low water saturation values ~ 35%. The upper part of the lower Bahariya sediments hosts the most promising reservoir intervals which should be considered during future exploration and development of the oil fields in the study area. Petrophysical evaluation of the lower Bahariya sediments was performed based on comprehensive interpretation of complete wireline logs suite from two wells in Salam oil field, southwest Shushan basin in the north Western Desert, Egypt. Several petrophysical parameters such as shale volume (VSH), total and effective porosities (PHIT, PHIE), water saturation (SW) and hydrocarbon saturation (SH) were deduced and utilized in the petrophysical subdivision of the lower Bahariya sediments. Neutron versus density, matrix volumetric versus matrix grain density and M-N crossplots revealed that quartzose sandstone is the dominant matrix component within the lower Bahariya sediments. Additionally, the litho-saturation crossplots typified the presence of oil-bearing intervals often associated with the quartzose sandstones with minimal contents of silts and clays. Dispersed and laminated clays are detrimental to the reservoir quality by obstructing the pore spaces and thus reducing the hydrocarbon flow storage and flow capacities. The obtained petrophysical results reveal that the lower Bahariya sediments have a good reservoir quality with high effective porosity values exceeding 18% and low water saturation values ~ 35%. The upper part of the lower Bahariya sediments hosts the most promising reservoir intervals which should be considered during future exploration and development of the oil fields in the study area. |
