We studied the relationship between fault system and hydrocarbon accumulation in Shawan Formation of Chepaizi Area, Jung-gar Basin. Firstly, faults were characterized by integrated application of the 2D and 3D seismic data. Secondly, taking the east fault of well P206 and the north fault of P2-7O as example,qualitative analysis and quantitative characterization were carried out to evaluate the fault sealing. Finally,combined with previous research achievements and exploration practice, we analyzed the relationship between faults and traps, hydrocarbon migration and accumulation. The results show that the trap formed by faults of Shawan Formation and stratigraphic pinch-out line is the beneficial area, and the long-term activity of Hongche Fault and the longitudinal connection of small faults in Himalayan Period caused the migration of hydrocarbon to Shawan Formation, and the traps communicated with faults is more beneficial to the hydrocarbon accumulation.%研究了准噶尔盆地西缘车排子地区沙湾组断裂系统与油气成藏的关系.首先,综合应用二维和三维地震资料进行了断层描述；然后,以排206井东断层和排2-70井北断层为例,从定性分析和定量描述两方面综合评价了断层的封堵性；最后,结合前人的研究成果和勘探实践,分析了断层与圈闭、油气运移、油气成藏的关系.研究认为,该区沙湾组断层与地层尖灭线匹配形成的圈闭是有利圈闭,红车断裂的长期活动和喜马拉雅期小断层的纵向沟通使得油气得以运移至沙湾组地层,有断层沟通的圈闭更有利于油气成藏.
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