Petrophysical evaluation of Lower Bahariya Reservoir using integrated ‎well-logs and core data analysis in Yasser field, North Western Desert, ‎Egypt.‎

Document Type : Original Article

Authors

1 Associate Prof. Dr. of petrophysics and well logging Zagazig University, Faculty of Science, Geology Department, 44519, Zagazig, Egypt emad_eysa@zu.ed.eg

2 Ass. Prof. Dr. of stratigraphy Zagazig University, Faculty of Science, Geology Department, 44519, Zagazig, Egypt

3 Prof. Dr. of sedimentary rocks Zagazig University, Faculty of Science, Geology Department, 44519, Zagazig, Egypt

4 Geology Department, Faculty of science, Zagazig University, Egypt

Abstract

The northern part of the Western Desert represents one of Egypt's most prolific and ‎prospective oil and gas provinces. Yasser oil field is considered as one of the main oil ‎fields in the north Western Desert region due to its high production from many reservoirs. The ‎aim of this study is directed to evaluate the reservoir characteristics of Lower Bahariya using ‎logging data for five wells and core data for three wells.‎
Core data analysis in this work involves ‎the construction of histograms, relations, and statistical analysis for the porosity and the permeability ‎of Lower Bahariya reservoir. Petrophysical data are illustrated in iso-parametric maps for total gross ‎thickness, net pay thickness, effective porosity (e %), shale volume (Vsh %), water saturation ‎‎(Sw %), hydrocarbon saturation (Sh %), bulk pore volume (BPV) and oil in place indicator ‎‎(OIPI).
The obtained high porosity and permeability values indicate that the Lower ‎Bahariya is described as good to very good reservoir. The average of porosity values ‎‎(helium and fluid) in the three wells range from 16.75% to 22.63%. The porosity values give ‎homogeneity whereas the permeability values were heterogeneous. The positive trends with ‎strong correlation coefficients in the relation between porosity types (fluid and helium) and ‎porosity-permeability indicate homogeneity of pore spaces types and high percentages of ‎effective porosity. The distribution maps reflect that the north and northeastern directions of ‎the studied area is the most favorable part for accumulation and production. These ‎directions are recommended for future exploration and drilling new wells.‎

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