Assessment of Petroleum System Elements of the Jurassic Sediments in Matruh Basin, North Western Desert, Egypt
International Journal of Scientific Engineering and Applied Science (IJSEAS)
The Middle Jurassic sandstones of Upper and Lower Safa members acts as a hydrocarbon reservoirs in the subsurface in Matruh basin, Western Desert, Egypt. The present study aimed to achieve and analyze the Jurassic petroleum systems elements through the evaluation of the source rocks, reservoir rocks, determination of seal rocks and traps, in addition to the main processes that control any petroleum system, such as, maturation, generation, migration and trapping. Therefore, we can provide a
... for future hydrocarbon exploration and development. Several softwares have been used, Interactive Petrophysics IP used for different petrophysical models construction and PetroMod 2012.2 (1D) for geological & geochemical models construction and prediction. Source rock evaluation showed that there are two main source rocks in the Jurassic sediments, Upper and Lower Safa Shales and showed that both of them are considered as a very good in their total organic carbon content (TOC), and characterized by kerogen type III with minor of type II which reflect its capability to generate mainly gas with some oil. The Tmax and Ro of these source rocks are indicate that the Upper Safa source rocks are located in the late to over mature stages and lied in the gas generation stage, while the Lower Safa source rocks are located in the early to over mature stages and lied in gas and oil generation stage. The petrophysical evaluation indicate that there are two main reservoir units, Upper and Lower Safa sands, and it showed that the net effective pay thickness in the Upper Safa reservoir is ranging between 29 and 67.5 ft. the average effective porosity is 8.55 % and average hydrocarbon saturation is 78 %, while in the Lower Safa reservoir, the net effective pay thickness ranging between 29 and 53 ft, the average effective porosity is 8.9 % and average hydrocarbon saturation is 75 %, this indicates that both Upper and Lower Safa reservoirs can be considered as two of the most promising reservoirs in the northern part of the Western Desert of Egypt. Top seal for the Jurassic Safa Sands is provided by local intra-formational shale intervals within Upper and Lower Safa themselves, the overburden shales of Zahra member and effective compact carbonates of Masajid Formation. The traps are typically of structure type.