Abstract: Yanqi basin is one of Jurassic petroliferous basins in Xinjiang region, western China. To find out traps related to faults is an important target for petroleum exploration in next few years. Applying fault daubing technique integrated with the history of faulting move-ment, this paper analyzed the sealing effects of a few major faults in Bohu depression of Yanqi basin, as well as their effects on petroleum mi-gration and accumulation. This provides valuable basis for study of hydrocarbon reservoir mechanism and evaluation of fault closure in Yanqi basin.

Key words: fault, petroleum migration, oil and gas pool, Yanqi basin, Jurassic