The Kinetic Studies Of Strike-slip Rift Basins

Central African Shear Zone is located in central Africa. It is a giant lithospheric fault named the pan-African mobile belt between the Africa and Congo craton and Nubia craton.It is an important internal boundary of land mass in the African continent. The Central African Shear Zone and Pernambuco dextral shear fracture system in Brazil are inherited the dextral shear zone formed in Pan-African orogeny and belonged to the same fault zone.Central African rift system refers to a series of Cenozoic rift basin that developed along the Central African shear zone in the Sudan, Chad and Niger territory.The world's most abundant oil and gas reserves per unit area of the basin tend to have a close relationship with the shear fracture translational motion. Forming a slip basin often related with large-scale regional or global giant slip fault zone activities. Therefore, the study of the mechanical mechanism of this kind of basin is important to the oil and gas exploration.This paper mainly studies the related strike-slip rift basin dynamics genetic mechanism, including the tectonic genesis background research and geodynamics. This paper carried out numerical simulation of dynamics of basin genesis and found out the reasons of various types of passive rift basin from the mechanical mechanism. For example,the Muglad and Termit basin in rift system of the West, using the finite element numerical simulation analysis of whether the slip-induced kinetic mechanisms in the West African rift system such passive rift basin and other groups can be formed.Apply the ansys software for the mechanical simulation of the two basins. Based on the geological model of Muglad basin, we apply the mechanics finite element numerical simulation method for flat mechanics in Paleogene period and for sectional mechanics in Early Cretaceous, Late Cretaceous and Paleogene. Based on the geological model of Termit basin, we apply the mechanics finite element numerical simulation method for flat mechanics in Paleogene, Early Cretaceous periods and for sectional mechanics in Early Cretaceous, Late Cretaceous and Paleogene.Through the study of the typical passive rift basin located in the African plate, we canconclude that the muglad basin is a passive rift basin-slip basin undered the combined effect of the slip effect and extensional on both sides of the shear zones in northwestern Central African. In the Termite basin, under conditions with both large and small fault exists, under the tensile force, large fault will preferentially occur deformed. As a result, the West African Mesozoic rift system is at Pangaea cracking tectonic background, non-fixed Northwest, East and North Africa north east drift, central and southern Africa rotate counterclockwise role in the formation. The differences motion between these three sub-continental blocks in the African continent, leading to the formation and development of the West African rift system. Strike-slip faults in Central Africa and the West African rift system formed simultaneously in this unified tectonic stress field.