Cenozoic tectonic evolution and hydrocarbon accumulation in Bonan Region

Based on the balanced section and the decompaction correction principle,the tectonic evolution of Cenozoic in the Bonan Region is analyzed from tectonic geometry and movement.The marginal slip normal faults are the main feature of the structure.Influenced by basement rocks and border faults,the structures in the west and in the east are obviously different.The Cenozoic tectonic evolution is divided into Paleogene faulting episode,Neogene depressing episode and Quaternary Depressing episode.The period between E_(k) and Es_(3) is the primary faulting phase.The tectonic movement controls the distribution and type of traps.The Tertiary traps mainly occur in the northward bulge in the northern slope of the Chenjiazhuang uplift,with the stratigraphic trap in the south and the structural and structural-lithologic traps in the north.The stratigraphic trap is the main type in the upper position of the slope south of the slope break,while the structural trap and the structural-lithologic trap dominate in the deep water area and the in the vicinity of the slope break.