Integrated geophysical assessment of the Abu Roash C member for hydrocarbon prospectivity in the Sitra Field Abu El Gharadig Basin, Egypt

The Abu Roash C Member in Egypt's Sitra Field (Abu El-Gharadig Basin, Western Desert) has been comprehensively assessed for its hydrocarbon reservoir potential through an integrated geological and geophysical study. The analysis combined well log data from four wells, core samples, high-resolution borehole images (captured via the Oil Mud Reservoir Imager - OMRI), and 2D post-stack time migration (PSTM) seismic interpretation. Petrophysical evaluation included log quality control, identification of hydrocarbon-bearing intervals, and quantification of key reservoir parameters (1) Shale volume (2) Effective porosity (3) Water saturation. Between wells Sitra-8-13 and Sitra-8-17, a laterally continuous sandstone unit was identified, demonstrating favorable petrophysical characteristics consistent with good reservoir quality with average porosity 11%, shale volume 9% and water saturation 56%. This reservoir is bounded by fine-grained siltstones and shales, interpreted as effective sealing units. Seismic interpretation revealed NW-SE oriented fault systems, indicating potential structural traps conducive to hydrocarbon entrapment. Lithological and petrographic analyses-encompassing core descriptions, lithofacies classification, and porosity measurements-suggest a paleoenvironment of shallow marine to marginal marine setting, likely influenced by tidal and storm processes, which explains the observed lithologic heterogeneity. These integrated findings affirm the Abu Roash C Member as a viable conventional hydrocarbon reservoir and provide critical insights for guiding future exploration and development in the basin.