Abstract:

 Based on the new interpretation on seismic data, integrated with drilling and regional geology, the paper dissected the fault assemblage, fault forming phases, fault evolution and the rule of structural high development by means of fault growth index, balanced section, and trend thickness method. According to fault assemblage, Anderson fault mode and Harding^,s statements on stress and strain of strike-slip fault, stress condition since Cenozoic in Mabei area was discussed. Meanwhile, by adopting the dynamic approach, the coupling between inchoate-nowadays geological structures and hydrocarbon reservoirs is studied. Multi-stage faults in Mabei area is the strike-slip fault system dominated by Maxian fault. The fault evolution in the study area is closely linked with Maxian fault. There was significant coupling relationship between the fracture and inchoate-nowadays geological structures, and it is the fault and the inchoate-nowadays geological structures that jointly controlled the formation, reconstruction and distribution of Cenozoic hydrocarbon reservoirs.

Key words: fracture evolution, structural high migration, hydrocarbon reservoir, Mabei area, northern margin of Qaidam Basin