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The Shoushan Basin is an important hydrocarbon province in the northern Western Desert, Egypt. The present study deals with petrophysical evaluation, the identification of the potential and generating capability of hydrocarbon generation of Jurassic and Cretaceous formations in Shoushan Basin were investigated by studying the composite logs for five wells. Jurassic units include; Ras Qattara, Khatatba and Masajid formations. Jurassic formations are not recorded in the investigated wells except at TUT-21 well. Cretaceous units are represented by Alam El Bueib, Kharita and Abu Roash formations. The Alam El-Bueib Formation can be considered as an important reservoir rock in the Shoushan Basin, which is composed mainly of thick massive, argillaceous and calcareous sandstone with some shale and carbonate interbeds. The studied Alam El-Bueib Formation reservoirs include three main units; AEB-1, AEB-3A, 3D and 3E) subunits. Total organic carbon and Rock-Eval pyrolysis for 90 rock samples and geochemical model were used to determine the source rock characteristics and petroleum generative potentials of prospective source rocks, including quantity, type of organic matter, and their thermal maturity level. The results were then incorporated into basin modeling in order to improve our understanding of burial/ thermal histories and hydrocarbon generation and extraction from Jurassic-Cretaceous source rocks. Ras Qattara and Masajid formations have poor to fair generation potential while, Yakout and Khatatba formations have poor to excellent generation potential. Vitrinite reflectance values indicate that Ras Qatara, Yakout and Khatatba formations source rocks are mature and lie within oil generation stage. The organic richness of the Cretaceous formations varies from poor to excellent. The Cretaceous source rocks contain type IV kerogen and it indicates that the Cretaceous formations have very little gas potential and will not yield oil in any maturation stage. Vitrinite reflectance values indicate that Alam El Bueib and Kharita source rocks are becoming mature and lie within the onset of the oil generation stage. The burial history modeling shows that Ras Qattara and Yakout formations lie within the main mature oil window. Khataba and Masajid formations lie within oil windows and Alam El-Bueib and Khrita Formations are still within the early stage of hydrocarbon generation. While the Abu Roash Formation lie within immature stage.

iosr journal of applied geology and geophysics

Petrophysical Evaluation and Potential Capability of Hydrocarbon Generation of Jurassic and Cretaceous Source Rocks in Shoushan Basin, North Western Desert, Egypt