Structural evolution of JG and JD fields, Abu Gharadig basin, Western Desert, Egypt, and its impact on hydrocarbon exploration

摘要

The Abu Gharadig basin in the Western Desert (NW Egypt) is a mature hydrocarbon province with over 95% of the oiland gas felds in the Upper Cretaceous reservoirs. JG and JD felds are producing felds; JG is producing from the Jurassicreservoirs, while the JD feld is producing from the shallower Tertiary reservoir. Both felds lie on the footwall of the mainbounding fault of Abu Gharadig basin trending E–W and NW–SE. Four dry wells have been drilled into the deeper Jurassicreservoir, and this paper will try to fgure out the possible reasons for the failure of Jurassic reservoir in JD compared to JGfeld 2002. Two main geological cross sections have been created. The frst cross section ties the JD feld to the Abu Gharadigbasin and the second one ties the JG feld 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 commontime for the hydrocarbon expulsion in Abu Gharadig basin, both JG and JD traps were formed at that time. The restorationclearly showed the juxtaposition of the Jurassic reservoirs against Abu Roash and Khoman (shale, limestone and chalk) inJG. In contrary, the Jurassic reservoir is juxtaposed with Kharita and Alam El Bueb (Sandstone) in JD. Fault juxtapositionhas been carried out also and concluded the juxtaposition of Abu Roash F member and Masajid fip East of JD well so nochance of Abu Roash F member charging JD.