Petrophysical evaluation of sandstone gas reservoir using integrated well logs and core data for the Lower Cretaceous Kharita formation, Western Desert, Egypt

Abstract This study aims to evaluate Kharita gas reservoir enhance the production. The increase in water-cut ratio reduces left hydrocarbons’ amount behind pipe. Accurate determination of pore throats, pores connectivity and fluid distribution are central elements improved description. integration core logging data responses is often used draw inferences about lithology, depositional sequences, facies, content. These based on petrophysical models utilizing correlations among tools’ as well rocks fluids properties. Upper Formation produces condensate from clastic sandstone Badr-3 field, western desert Egypt. It consists mainly with shale intercalations. subdivided into three sub-units A, B C that pressure communication. Hence, a new further investigation review for previously calculated GIIP (gas initially place) was initiated. results this yielded main uncertainty volumetric calculations evaluation; subsequently, unconventional evaluation approach performed. sands thickness varies between more than 9 up 61 m average porosity values range 0.08 0.17 PU while permeability 1.89 696.66 mD. hydrocarbon saturation 46 97%. Reservoir cutoff 55% by using cross-plot volume (Toby Darling concept) utilized discriminate non-reservoir sections. model calculate porosity, density log. Archie saturation/height function were water calibrate transition zone. porosity–permeability (POR-PERM) transform equation estimate (absolute permeability) four facies (High Quality Reservoir, Moderate Low Highly Shale Reservoir). Core have shown variations quality parameters (porosity one other. Integration all pressures indicated there different types (oil, water) level. geological geophysical log helped conduct comprehensive assessment better estimation achieve understanding encroachment reservoir. big challenge most correct calculating sand. resulted doubling volumes so perforation campaign performed confirm calculations, which showed good match results. drilled targeting low sand found them high almost near virgin pressure.