Tectonic chaiacteristics and tectonic style of Duoaosai basin in central Africa shear zone

Through the structural evolution study of central Africa shear zone,in combination with the structure characteristics of the basin,it was made clear the formation of Duoaosai basin was controlled by the strong right-lateral strike-slipping.In late cretaceous,the African plate collided with the Eurasian plate and the regional stress field changed,which resulted in the formation of the northsouth extrusion stress field.Elaborate analysis of the central Africa shear zone indicated there were at least three events of tectonic compression and the apparent reversal occurred in the structure of the basin,which formed a variety of tectonic styles such as reversal anticline and flower-like structure,which laid a good foundation for trap formation.Meantime,the hydrocarbon source rocks in this period also began to enter hydrocarbon expulsion stage in large scale,the fracture formed by the tectonic movement created advantageous conditions for hydrocarbon migration.