3D geological modelling for CO2 storage assessment in the Abu Roash-A reservoir, Beni Suef field, Western Desert, Egypt

Résumé

This study presents the first systematic assessment of CO 2 storage potential in the Cretaceous Abu Roash-A sandstone reservoir of the Beni Suef Field in Egypt’s Western Desert. An integrated, multidisciplinary workflow was employed, combining two-dimensional (2D) seismic interpretation, petrophysical evaluation, and 3D static reservoir modelling to characterise the structural framework, assess reservoir quality, and quantify the anticipated CO 2 storage volume. Structural interpretation reveals a fault-bounded anticlinal trap with three-way dip closures against NE-SW and NW-SE trending normal faults, suggesting geological conditions favourable for lateral containment. The reservoir shows a well-defined oil-water contact at 4,200 ft and a hydrocarbon column of 300 ft. Stratigraphic interpretation indicates a thick, regionally extensive caprock system (Khoman and Apollonia formations) overlying the sandstone reservoir. Petrophysical analysis of the Abu Roash-A sandstone indicates low to moderate shale content (Vsh up to 0.25 in northeastern zones, lower in southwestern areas), favourable porosity (15%–24%), and moderate permeability (mean ∼12.5 mD, reaching up to 150 mD) across the structural crest, identifying the elevated block between wells BS-5X and BS-11 as the optimal injection interval. Probabilistic storage calculations yield an estimated CO 2 capacity ranging from 20 Mt (low scenario) to 140 Mt (high scenario), with a base case of approximately 60 Mt, and the central and southwestern sectors showing the highest potential. The results provide a transferable framework for CO 2 storage projects in mature oil reservoirs across North Africa and deliver critical scientific insights to advance Egypt’s decarbonisation and climate-action goals under the National Climate Change Strategy 2050.

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