Reservoir characterization of Abu Roash-A sandstone by integration of core analysis and assessment of hydraulic flow units, Beni Suef oil Field, Egypt

The East Beni Suef (EBS) concession in the north Western Desert, Egypt, hosts significant reserves. This study integrates core analysis, petrophysical evaluation from well logs, and statistical assessment to characterize reservoir properties and determine hydraulic flow units (HFUs). The Upper Cretaceous Abu Roash-A (A/R-A) sandstone is a considerable reservoir, with hydrocarbons sourced mainly from the Lower Kharita shale. Facies analysis identifies two types of sandstone within a transgressive sequence: Type-1, medium to coarse-grained oil-saturated facies, and Type-2, finegrained, bioturbated facies. Hydraulic flow unit (HFU) assessment divides the reservoir into high- and low-quality zones based on flow zone indicators (FZI), highlighting porosity and permeability variations. Statistical analyses reveal porosity values ranging between 20% and 24%, with Permeability predominantly below 20 mD, exhibiting anisotropic fluid flow due to vertical and horizontal Permeability differences. The Pickett Plot analysis and Archie’s equation confirm the presence of producible hydrocarbons, with an Oil-Water Contact (OWC) identified at -3450 ft. The reservoir demonstrates heterogeneity, with Permeability strongly correlated with porosity and influenced by facies distribution. The findings provide insights into the reservoir's quality and production potential, supporting enhanced hydrocarbon recovery strategies that identified Abu Roash-A (A/R-A) sandstone as a promising hydrocarbon reservoir and more suitable site for fluids sequestration.