Seismic interpretation for the Jurassic/Paleozoic reservoirs of QASR gas field, Shushan-Matrouh basin north Western Desert, Egypt

Abstract

The QASR gas field lies in the northern part of Shushan-Matrouh Basin (northern part of the Western Desert). Jurassic (Lower Safa)/Paleozoic are a reservoir rocks, in which the gas is trapped in clastic Sandstone, depending on structural framework affecting it. The QASR field structure is one of the most complex structures in the Western Desert of Egypt. The Jurassic (Lower Safa) and Paleozoic formations are consists of sandstone, siltstone with some shale streaks, indicating shallow marine facies, its sequence may reach a maximum thickness of over 900 ft in the northeastern part of Shushan-Matrouh basin.The combination between well logs data and 3D seismic interpretation represent that the Jurassic (Lower Safa)/Paleozoic form a complex horst block, which is bounded by NE-SW trending deep-seated faults, with throws is excess of 300 ft. The migration of hydrocarbons into the QASR structure could either be laterally from source rocks that occur in the Shushan basin to the west, and vertically from the sub-basin to the north via the QASR-OZORIS bounding fault.Time and depth-structural maps of Jurassic (Lower Safa)/Paleozoic describe various structure aspects that play a vital role in the hydrocarbon potentialities and prospect identification in the area. One incipient element of exploration and development success is to detect the faults that provide structural closure and traps.Two major faults run in the NE-SW direction and configurator a manner of horst and graben blocks. In addition, NWSW trending faults cut these blocks and form a right-lateral strike-slip component of displacement. Four-way dip structural closure represents the fruitful locations for high production and new prospect wells in the QASR gas field and other similar setting elsewhere. Keywords: Jurassic (Lower Safa)/Paleozoic, QASR gas field, Lower Safa, Seismic interpretation, Deep-seated faults, Shushan/Matrouh basins, North Western Desert