Fault System Study in South Beir Sag

Abstract

The Tamt basin is a Mesozoic-Cenozoic rift basin. Strongly influenced by the late tectonism, the basin structure and evolution has a very complex process. Based on Interpretation of 3D seismic data, the faults are divided into four categories in the system, that is, extensional normal faults, shear or torsional tensional normal faults, shear compression thrust faults and reversible faults. Major faults in the evolutionary sequence are divided into early development, late development, and long-term development, with good correlation between the formation and evolution of the basin. On the surface, the fault strike shift from NNE and NE to SN-trending and NNW. For the sector, fault system can be divided into the lower stretch fault system and the upper strike-slip fault system by the T22 seismic reflection layer. The structure style in South Beir Sag can be summed up as rift style, transtension style, transpression reverse style into three categories, and the different structural styles play an important role in the distribution of oil and gas. The results have positive guidance to oil and gas exploration in South Beir sag.