Petrophysical Evaluation Using Well logging of the Alam El-Beuib Reservoirs, Shushan Basin, Northern Western Desert, Egypt

Document Type : Research and Reference

Authors

1 Geology Department, Faculty of Science, Tanta University

2 Professor of Geophysics, President of the National Research Institute of Astronomy and Geophysics (NRIAG), Helwan

Abstract

Petrophysical analysis of some of the Lower Cretaceous Alam El-Bueib reservoir units has been carried out using wireline logs from four wells representing two fields (GEB and APRIES) located in the western part of the Shushan Basin, northern Western Desert. Several petrophysical parameters were calculated and used in the petrophysical subdivision of the studied reservoirs, including shale volume (VSH), total and effective porosities (PHIT, PHIE), water saturation (SW), and hydrocarbon saturation (SH). Neutron versus density and M-N crossplots indicated that quartzose sandstone is the major matrix component with minor carbonates in some units. Furthermore, the litho-saturation crossplots indicated the existence of oil-bearing intervals, which are frequently associated with quartzose sandstones with low silt and clay content. Dispersed and laminated clays are detrimental to the reservoir quality as it blocks pore spaces, hence decreasing the hydrocarbon storage and flow capacities. Analysis of petrophysical data shows that the studied units have a good reservoir quality, with effective porosity values averaging 9% and low water saturation values of less than 35%. The most prospective reservoir intervals are found in the upper and middle reservoir units and are recommended for future exploration and development.

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