Petrophysical analysis of well logs data for identification and characterization of the main reservoir of Al Baraka Oil Field, Komombo Basin, Upper Egypt

Abstract

The current study presents the log analysis results from two vertical onshore wells in Al Baraka oil Field, Komombo basin, upper Egypt. The Geophysical logs comprising gamma ray (GR), caliper (Cali), resistivity (LLD, LLS, and MSFL), photoelectric effect (PEE), neutron (NHPH) and density (RHOB) are used to study the petrophysical characteristics of the main identified reservoirs in this field. The key purpose of well logging analysis and interpretation is to obtain petrophysical properties of reservoirs such as shale volume, porosity, hydrocarbon saturation, net pay thickness, etc., for hydrocarbon exploration. Petrophysical analysis of well logs reveals that Al Baraka wells consist of three types of lithology: sand, shale, and siltstone. The obtained results show that there are two hydrocarbon-bearing zones named (S-E) and (S-D) zone for Al Baraka-4 well and Al Baraka-14 well, respectively; both had hydrocarbon reservoir bearing oil and lie in Six Hills Fm of the Lower Cretaceous. The generated cross-plots showed that the main reservoir lithology is composed of shaley sandstone to sandstone. The computed petrophysical parameters for the identified and characterized reservoir layers reveal that they have a total porosity range of 18.2–20.1%, water saturation of 57.7–36.6%, shale volume of 20–8.5% for (S-E) and (S-D) zone, respectively. The hydrocarbon saturation reaches to 42.5% for (S-E) zone and 36.6% for (S-E) zone; both hydrocarbons in these zones are movable. The net reservoir pay thickness is high in (S-E) zone reach to 24 ft. Below and above the oil-bearing reservoirs, there is a thick shale bed which acts as potential source rock or as a seal rock. The overall results indicated that the sandy reservoir units of ‘Al Baraka’ Field have the potential to contain significant accumulations of hydrocarbon, essential oil. It is recommended to integrate more wells and seismic data to better evaluate the reservoirs.