Document Type : Original Article
Authors
1
Department of Science, Faculty of Science, Tanta University, Tanta, Egypt
2
Department of Geology, Faculty of Science, Tanta University, Tanta, Egypt
3
Assistant General Manager, Khalda Petroleum Company, Cairo, Egypt
4
Department of Geology, Faculty of Science, Tanta University, Tanta, Egypt.
Abstract
The study area is located in the Abu El-Gharadig basin, between 29° 40' and 29° 45' north latitude and 28° 25' and 28° 32' east longitude. The aim of this study is to evaluate four formations that are located in the middle region in the of Abu El-Gharadig Basin, particularly in the Main Abu El-Gharadig Oil Field, North Western Desert, Egypt by conducting petrophysical analysis to investigate the hydrocarbon-bearing reservoirs of the Upper Cretaceous formations which are the Abu Roash "D" and "E" Mbs, as well as the Bahariya Formation. In order to achieve these goals, Interactive Petrophysics software (IP) version 3.5 helped in well logging evaluation the and the program provided us with various crossplots, which are the density-neutron crossplots and the M-M crossplots, for the sake of determining the reservoirs porosity and lithology as well as indicating the effect of shale and secondary porosity that may affect the hydrocarbon potentials of these reservoirs. In addition, the software serves this study by presenting analogs which indicate the vertical distribution of petrophysical parameters for each well in the study area to show the distribution of shale volume, porosity, water saturation, and the hydrocarbon saturation. Among other things, the analogs also reveal the presence of oil-bearing zones as a function of well depth. Analysis of petrophysical data reports that the Abu Roash "D" reservoir is mostly limestone with sandstone and shale lithology, while the Abu Roash "E" reservoir is primarily sandstone with shale, limestone, and dolomite lithology. The reservoirs in the Upper and Lower Bahariya are mostly sandstones, with some shaly and calcareous cement. The shale volumes in Abu Roash (D & E) and (Upper & Lower) Bahariya are 0.9 – 3.8 %, 8.2 – 13.7, 7.2 – 15.2, and 9 – 15.5 %, respectively, and the effective porosities are 6.7 – 14.7 %, 13.9 – 18.1 %, 13.1 – 15.5 % and 11.4 – 15.5 %, expressing the good reservoir quality of the zones. Petrophysical data from the Abu Roash and Bahariya reservoirs are shown on analogs to identify the most effective thicknesses with good hydrocarbon potential.
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