Petrography and Probable Reservoir Potentiality of Subsurface Jurassic Rocks at Abu Gharadiq Basin and Shoushan Sub-basin, North Western Desert, Egypt.

Core samples representing the Jurassic age from wells Bettey-1, Gibb Afia-1 and Mamura-1 were petrographically and petrophysically studied. The sediments represent deposition under various environmental conditions varying from low energy intertidal to energetic shallow water and shallow protected sub-tidal. These sediments were diagenetically affected by cementation, compaction, dissolution and leaching. The study revealed the probability of the effect of a tectonic activity during the lower Jurassic. The studied samples have good storage capacities due to high porosity of different varieties. The porosities which decrease with increasing depth, have originated mainly by leaching processes.