Petrophysical characterization of the heterogeneous shale-rich oil reservoirs: a case study of the Cenomanian Clastics, Abu Sennan Concession, North Western Desert of Egypt

Abstract Shale-rich reservoirs present a long-standing challenge for reservoir geologists because the clay minerals often induce large-scale heterogeneity in pore system. This work aims to understand impact of distribution and mineralogy which would enhance predictability best facies. We integrate seismic, well-log datasets investigate petrophysical characteristics clay-rich Cenomanian Clastics GPY oil field, north Western Desert Egypt. These comprise sandstone intervals are most prolific hydrocarbon reservoirs. Seismic data were used interpret main structural patterns as well different seismic The log utilized lithologic variations type clays parameters. Based on their lithological characteristics, Bahariya sandstones sub-divided into three rock units: Bahariya-3 (B-3), Bahariya-2 (B-2), Bahariya-1 (B-1), separated by thick laminated intervals. AR/G Member is dominated with relatively lower quality. Spectral gamma ray values reveal that smectite dominant mineral all studied Laminated B-1 B-2 units, whereas, B-3 unit Abu Roash G enriched clays. quartzose sand content decreases from increases AR/G. Therefore, facies fluid flow conduits system hosted streaks act good seal hydrocarbons pay zone.