Petrophysical evaluation and 3D reservoir modeling in Qawasim Formation, El Basant Gas Field, Nile Delta, Egypt: insights from well-log analysis and 2D seismic data

Abstract

This research focuses on characterizing the Late Miocene Qawasim Formation in the El Basant Gas Field, located in the Eastern part of the East Nile Delta onshore, 12.5 km south of El Manzala Lake, covering approximately 30.66 km². By integrating well-log analysis from five wells and seismic data interpretation from 30 2D seismic lines, this study identifies opportunities for enhancing our understanding of the subsurface geology, reservoir characterization, and reservoir potential of the El Basant Gas Field. The study area is characterized by step normal faults oriented northeast-southwest and northwest-southeast. Lithological analysis reveals abundant shale and sandstone facies, indicating significant gas potential. Petrophysical analysis confirms the Qawasim Formation as the primary reservoir, with a net pay thickness of about 23 m, effective porosity of around 34%, and hydrocarbon saturation of about 52%. A detailed 3D model assessed the influence of structural setting, facies, and petrophysical properties on the Qawasim Formation. Integrating these findings, two highly prospective locations were identified, with estimated Gas Initial In Place (GIIP) values of approximately 29.563 million cubic feet.