Inverted basin analysis and geological modeling, Razzak Oil Field, Western Desert, Egypt
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ORIGINAL PAPER
Inverted basin analysis and geological modeling, Razzak Oil Field, Western Desert, Egypt Mohamed Salah Sedek & Omar Mohamed Mohamed Al Mahdy
Received: 2 October 2011 / Accepted: 13 December 2011 # Saudi Society for Geosciences 2012
Abstract This paper deals with a geological modeling based on seismic and well data of the Razzak Oil Field, located in northwestern desert of Egypt aimed mainly at improving the knowledge on inversion tectonics in the sedimentary basin corresponding to the oil field. Contour maps of significant seismic horizons corresponding to the top of Meso-Cenozoic formations which represent the stratigraphic traps of the oil field (top Apollonia, top Abu Roash “G,” top Bahariya, and top Alamein) are presented. The final model consists of geological cross-sections showing the inversion basin in the Razzak Oil Field. From the seismic data interpretation and modeling, we have different results matching with regional tectonic and transcurrent motion model. There are two main fault trends: the first one was northeast–southwest matching the Jurassic rift where the Jurassic is characterized by normal faults that formed in conjunction with the opening of the Neo-Tethys, and the other fault trend is northwest–southeast matching with Cretaceous faults. This is followed by a period of compressive tectonism (Syrian Arc deformation) in which two of the Jurassic normal faulted blocks (one at the northern part and the other at the southern part of the Qattara–Alamein ridge in the Razzak field) are reactivated as reverse faulted by Eocene–Early Oligocene time. Keywords Razzak Oil Field . Geological modeling . Inverted basin analysis
M. S. Sedek (*) : O. M. M. Al Mahdy Cairo University, Giza, Egypt e-mail: [email protected] O. M. M. Al Mahdy e-mail: [email protected]
Introduction The Western Desert of Egypt has a significant hydrocarbon potential. New discoveries in the Western Desert, using advanced technologies including 3D seismic data and other accurate computerized geologic interpretation methods, ensure that the Western Desert has a promising future in oil and gas production. Almost 16% of Egypt’s hydrocarbon production is generated from the Western Desert (Sestini 1995). El Razzak Oil Field, one of the most important oil fields in Egypt, produces mainly from the Upper Jurassic and the Aptian (Cretaceous) formations and located in the north central part of the Western Desert of Egypt, between latitude (30°23′59.9923″ N and 30°36′0.0062″ N) and longitude (28°23′59.9906″ E and 28°36′0.0116″ E), north of the Qattara depression, about 55 km south of the Mediterranean coast and about 160 km southwest of Alexandria city (Fig. 1, Zein El Din et al. 1982). The oilfield lies on a northeast plunging anticline in a large faulted structural nose included in a belt of structural highs forming the Alamein– Quattara Ridge, part of the Egyptian continental shelf (Fig. 2). The following formations are the main Razzak Oil Field’s reservoirs respectively: 1. Abu Roash “G” dolomite 2. Bahariya f
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