Abstract
The Abu Gharadig basin in the Western Desert (NW Egypt) is a mature hydrocarbon province with over 95% of the oil and gas fields in the Upper Cretaceous reservoirs. JG and JD fields are producing fields; JG is producing from the Jurassic reservoirs, while the JD field is producing from the shallower Tertiary reservoir. Both fields lie on the footwall of the main bounding fault of Abu Gharadig basin trending E–W and NW–SE. Four dry wells have been drilled into the deeper Jurassic reservoir, and this paper will try to figure out the possible reasons for the failure of Jurassic reservoir in JD compared to JG field 2002. Two main geological cross sections have been created. The first cross section ties the JD field to the Abu Gharadig basin and the second one ties the JG field to same depocenter. The restoration has been carried out using 2D Move (Midland Valley software) to restore the two sections to their original tectonic status. Since the Eocene–Miocene is the common time for the hydrocarbon expulsion in Abu Gharadig basin, both JG and JD traps were formed at that time. The restoration clearly showed the juxtaposition of the Jurassic reservoirs against Abu Roash and Khoman (shale, limestone and chalk) in JG. In contrary, the Jurassic reservoir is juxtaposed with Kharita and Alam El Bueb (Sandstone) in JD. Fault juxtaposition has been carried out also and concluded the juxtaposition of Abu Roash F member and Masajid flip East of JD well so no chance of Abu Roash F member charging JD.
Highlights
The Abu Gharadig basin in the Western Desert (NW Egypt) is a mature hydrocarbon province with over 95% of the oil and gas fields in the Upper Cretaceous Abu Roash, Bahariya and Kharita sandstone reservoirs
The main purpose of this paper is to evaluate and compare the reservoir intervals of JG and JD fields to investigate the structural evolution and its impact
The main oil expulsion in Abu Gharadig basin was happened at the time of Apollonia age (Paleocene and Lower Eocene) the main reservoirs in JG and JD field Lower Safa and upper Safa (Jurassic), and there are an oil-bearing reservoir in JG field and a water-bearing reservoir in JD
Summary
The Abu Gharadig basin in the Western Desert (NW Egypt) is a mature hydrocarbon province with over 95% of the oil and gas fields in the Upper Cretaceous Abu Roash, Bahariya and Kharita sandstone reservoirs. Many wells had penetrated the thick Lower Cretaceous Alam El Bueib sandstone reservoir, but no significant discoveries were made. This led most operators to believe that there was very little prospectivity at deeper levels, in particular in the Jurassic Safa sandstones overlying the Paleozoic basement. JG filed is one of the main oil-producing fields from the Jurassic section in Abu Gharadig basin and JD is the closest one for it; both of them are on the main bounding fault for Abu Gharadig basin, but JD. The seismic interpretation and the 2D restoration are the main workflow items to figure out why JD is dry at the Jurassic level and JG is producing from the same level while they are very close to each other and lies on the same main bounding fault.
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