Abstract: By analysis of the hydrocarbon accumulation conditions in Wancheng fault zone,and combining with the oil and gas distribution and accumulation study of the discovered reservoirs, it is revealed that the main controlling factors for oil and gas accumulation at Cretaceous Period include the effective source rocks,the faults,and the favorable reservoir bed;and the existence of an effective trap is one of the key factors.Meanwhile,study on hydrocarbon accumulation of buried hill type reservoir shows that the source rocks are characterized by marine origin that probably locate in the lower Xingouzui Member.Therefore,it is necessary to carry out more detailed study on oil and gas accumulation at Cretaceous Period,and the buried hill type reservoir shouldl be considered as a target for the exploration prospect in the near future.