Abstract: This paper presents the quantitative analysis of fault activity intensity and regularity of Guantao formation and the systematic study of its effect on controlling the hydrocarbon accumulation. The results show that the inherited major fault and the sub-fault of Guantao formation served as the main channels for vertical hydrocarbon migration; the fault activity controlled the vertical and horizontal distribution through its control to vertical hydrocarbon migration; the active stage and intensity of the major fault and the sub-fault determined the difference between the vertical and the horizontal distributions of oil-gas reservoirs in Guantao stage. It is predicted that the main areas for petroleum prospecting in Jiyang depression could be at Zhanhua sag and beach area.

Key words: Jiyang depression, Guanta formation, fault activity, hydrocarbon accumulation, control effect