Abstract:

Kongnan area of Huanghua depression has experienced rift stage, faultedsag stage and sag stage with complex fault systems. Based on the activity, the fault systems can be divided into two types: The Cangdong extension fault system and Xuxi rightlateral strike-slip fault system. Cangdong fault is a listric normal fault slipping into the deep crust and controlling the global deformation of Kongnan area. The Xuxi fault can be considered as a secondary fault in the hanging wall of Cangdong fault. In the stage of Kongdian Formation depositing, the two faults performed as normal faults, cocontrolling the distribution of Kongdian Formation. When the 3rd Member of Shahejie Formation was depositing,  Xuxi fault system performed as a right-lateral strike-slip fault which was influenced by the pre-existed basement fault. With the control of the process of extension and strike-slip，abundant hydrocarbon had accumulated in the centralnorth part  of Kongnan area.

Key words:  Huanghua depression, Kongnan area, Cenozoic, fault system, extension and strike-slip