Abstract: Based on the study of structural evolution and sedimentary filling of Santanghu Basin, in terms of hydrocarbon accumulation, this article analyses the hydrocarbon passage system and their controlling on hydrocarbon migration by use of the study method of passage system comprehensively. The results show that unconformity, fault and sand body are identified as three important pathway types in this area. Faults control the longitudinal distribution of Jurassic reservoir, the migrating capability of unconformity and sand body controls the planar distribution of Jurassic reservoir. The compound passage system, including fault-unconformity-sand body type and fault-sand body type that control two models of hydrocarbon accumulation, is formed by the combination of different elements. And the rule of oil and gas accumulation is further studied, which provides theoretical basis for oil and gas exploration.

Key words: pathway system, Jurassic, accumulation model, controlling, Santanghu Basin