Abstract: Taking Wellblock Lu?15 in Sangequan swell of western Luliang uplift in hinterland of Junggar basin, the fault sealing and the process of different faults in property and scale are analyzed in hydrocarbon accumulation. The results show that that the fault in northern Well Lu?2 is good in sealing property for its early transport and present sealing as critical controlling factors, while the fault in southern Well Lu?15 is poor. The distribution of oil and gas in space is mainly controlled by the growth faults with large throw, while episodic faults with small throw in a reservoir is of few influnce on the oil?gas preservation in this area