Abstract：Using a vast amount of seismic,gravitational and magnetic data as well as related drilling and geologic data acquired in the west of Zengmu basin,the paper elaborated seismic reflection feature,depositional feature,regional geology and structural history of the region and synthetically analyzed the geologic structural feature in detail.The article considered that the Zengmu basin is a peripheral foreland basin developed in block of convergent belt;its structural evolution experienced three steps:foreland depression,strike-slip reformation and regional subsideuce;there are five unconformable interfaces:T2,T3,T31,T4,T5(Tg)that can be seen on the seismic data section; faults and local structures are developed in the basin,which include five categories;mud diapire,fault block,flowered structure,inverted structure and buried hill.
