Integration of Core, Log, and Petrographic Data For Petrophysical Analysis of The Nubia Sandstone Reservoir, October Field, Gulf Of Suez

By

Gamal Ragab Gaafar¹, Mahmoud Youssery Zein El-Din²

(1) GUPCO, Cairo, Egypt (2) Al-Azhar University, Cairo, Egypt

A detailed geological and petrophysical study of the Nubia sandstone reservoir in October Oil Field has been made to interpret the reservoir heterogeneity and factors affecting reservoir damage. Using a computer processed log analysis program, the reservoir has been subdivided into six zones based on the shale content, porosity, and permeability variations. A continuous shale beds have been identified throughout the drilled section, which probably act as a barrier to the vertical flow of the fluids through the reservoir.

The constructed reservoir geology model shows that the water encroachment can be explained as edge water drive, and is controlled by the continuous shale beds, which prevent the vertical fluid flow.

The factors affecting reservoir damage and variation in the petrophysical characteristics of the reservoir should determine programs for efficient water flooding which may increase the maximum oil recovery.