Prospect evaluation of BED 3 and Sitra oilfields, Abu Gharadig Basin, North Western Desert, Egypt | ||
| NRIAG Journal of Astronomy and Geophysics | ||
| Volume 4, Issue 2, December 2015, Pages 222-235 PDF (10.32 M) | ||
| DOI: 10.1016/j.nrjag.2015.09.002 | ||
| Authors | ||
| Ibrahim Salem; Hosni Ghazala; Waleed El Diasty | ||
| Abstract | ||
| The occurrence of hydrocarbons is closely linked to the elements of petroleum system history of the BED 3 and Sitra 8 oilfields, which has created multiple reservoir and seal combinations. BED 3 Field and Sitra concessions occupy the northwestern part of the Abu Gharadig Basin and extends between latitudes 29°45′ and 30°05′N and longitudes 27°30′ and 28°10′E. The comprehensive integration of the geo-related data and the interpretation of the well logging, geochemical, seismic data in time domain and depth and sealing mechanisms explain the occurrence of hydrocarbons in some certain reservoirs during cretaceous age and other reservoirs in the same fields don’t have any hydrocarbon accumulation. Detailed seismic data interpretation was performed for the target units of BED 3 and Sitra 8 oilfields in time domain and converted to depth domain. Sitra 8 Field is a three-way dip closure bounded by NW–SE faults while BED 3 field is represented by a WNW–ESE trending horst dipping to the east. The Albian–Cenomanian Kharita Formation has a high energy shallow marine shelf environment and considered as the main pay zone in the BED 3 oilfield. On the other hand, Kharita sands are dry in the Sitra 8 Field. Also, the shallow marine shale, sandstone, limestone and dolomite interbeds of the Abu Roash G Member are another hydrocarbon bearing reservoir in the Sitra 8 Field. Sealing mechanisms were applied to explain why certain reservoirs have hydrocarbon and others don’t. Allan’s juxtaposition diagram for the main faults in the study area shows that Kharita sands in BED 3 area have excellent juxtaposition as Kharita juxtapose to upper Bahariya and intra Bahariya, which consist of shale and limestone. Abu Roash G sands in BED 3 area have bad juxtaposition as the Abu Roash G juxtapose to Abu Roash C sand (sand juxtaposed sand). Allan’s diagram shows that the Abu Roash G reservoir (main target) in Sitra 8 is juxtaposing Abu Roash D which is composed of limestone and shale, which acts as very good seal rock, while the Kharita reservoir is juxtaposing Abu Roash G sand (sand juxtaposed sand) from the crest position which can explain the bad juxtaposition. | ||
| Keywords | ||
| BED 3 and Sitra oilfields; Abu Gharadig Basin; Prospect evaluation; Egypt | ||
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