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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 59 (1975)

Issue: 3. (March)

First Page: 510

Last Page: 523

Title: Petrographic Characteristics of Oil-Bearing Rocks in Alamein Oil Field; Significance in Source-Reservoir Relations in Northern Western Desert, Egypt

Author(s): M. Hamed Metwalli (2), Y. E. Abd El-Hady (2)


In petroleum potential the northern part of the Western Desert of Egypt has become one of the most promising localities of Egypt since the discovery of the Alamein oil field by the Western Desert Operating Petroleum Company (WEPCO).

The oil production from the Alamein field comes from Aptian rocks. The Aptian series can be subdivided into two lithostratigraphic units. The lower unit is essentially clastic, whereas the upper one is mainly carbonate rock and commonly is known as the Alamein Dolomite.

A petrographic study of the oil-bearing carbonate rocks of the Aptian series in Alamein oil field, the overlying sealing rocks, and the underlying carbonate beds and sandstones of Middle Jurassic age indicated that the dolomites of the Alamein are of syngenetic origin and were subjected to a diagenetic dedolomitization process by volume replacement rather than by molecular replacement.

This study revealed that the petrographic characteristics of the Alamein Dolomite are important in the migration and accumulation of petroleum, as well as the source-reservoir relation in the Western Desert of Egypt petroleum province.

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