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Development of Secondary Porosity in Jurassic Deep Reservoir in Western Desert

By

Al Moataz Hassouba1, Mohamed Mahmoud El Sarawy1

(1) Gulf of Suez Petroleum Company (GUPCO), P.O.Box.2400, Cairo, Egypt

For long Jurassic reservoir in the Western Desert of Egypt represents a challenge for explorationists as it usually occurred deeply buried, hence many think that the primary porosity of this reservoir will be damaged due to subjection to enormous overburden pressure.

Detailed petrographic examination of rock samples shows that the dissolution, corrosion and leaching of some rock samples play great role in developing secondary porosity in clastic Jurassic reservoir.

The average recorded porosity obtained from the study was ranging from 8 to 14% at depth 14000 ft. All porosity data were plotted using Nagtegall’s curve and extrapolated the porosity values to different depths.

The result of this study encourages exploring the Jurassic reservoirs in the deep horizons of the Western Desert and opens new era of extensive exploration.