Bulletin of Canadian Petroleum Geology, Vol.43, No.2, 156-176, 1995
GEOLOGY AND HYDROCARBON HABITAT IN RIFT SETTING - NORTHERN AND CENTRAL GULF OF SUEZ, EGYPT
The area of concern is part of the prolific Gulf of Suez oil basin which contains an excess of 40 oil fields with reserves ranging from 1350 MMbl to less than 1 MMbl in reservoirs from Early Paleozoic to post-Miocene in age. The lithostratigraphic units in the northern and central Gulf of Suez can be subdivided into three megasequences, a prerift succession (pre-Miocene), a synrift succession (Miocene) and a postrift succession (post-Miocene). These units vary in lithology, thickness, areal distribution and depositional environment. The interpretation of both geological and geophysical data shows that the northern and central Gulf of Suez consists of northwest-trending elongated troughs. These contain several high trends which are dislocated by northeast- and east-northeast-trending cross faults. Major prerift and synrift rich source rocks could yield oil and/or gas and are mature enough in the deep kitchens to generate hydrocarbons. Geochemical parameters, sterane distribution and biomarker correlations show a single major group of oils, generated from marine source rocks. It is believed that oils in the north and central Gulf of Suez were sourced from the prerift beds. The pre-Cenomanian sediments, Late Cretaceous Nezzazat sandstones and the fractured Eocene Thebes limestone form prerift reservoirs, while the Miocene sandstones and carbonates of the Nukhul, Rudeis, Kareem and Belayim formations and the sandstones of South Gharib, Zeit and post-Zeit are synrift reservoirs, which are more important in the northern Gulf of Suez. The Upper Miocene Evaporites (South Gharib and Zeit formations) are the ultimate seal in the central Gulf of Suez, whereas the shale and dense Limestones of the prerift and the synrift stratigraphic units are the primary seal in the northern Gulf of Suez. Structural, stratigraphic and combination traps are encountered in the study area. The northern Gulf of Suez has an excellent oil exploration potential as few plays have been tested and the central Gulf of Suez still has untested plays.