准噶尔盆地西缘车排子地区断层封闭性研究

STUDY OF FAULT SEALING IN CHEPAIZI REGION IN THE WEST OF JUNGGAR BASIN

准噶尔盆地西缘车排子地区断层横向延伸较短,断距小,大多为高角度正断层。主要发育4种类型,分别为:深浅部均发育的晚期断层、层间断层、只在浅部发育的晚期断层以及喜山早期已经开始形成的早期断层。研究区以滩坝相岩性油藏为主,断层输导是该区油气成藏的主要控制因素。运用应力分析、模糊综合评判和非线性映射等断层封闭性方法进行对比分析,选择2种泥岩涂抹方法对区内6条重要断层进行评价。对排208井南断层和排17井东断层进行封闭性预测研究,该断层在塔西河组垂向封闭,具"下开上闭"特征,既有侧向输导层,也有顶部封堵层。研究成果有效地指导了勘探生产,获得了较好的油气储量。

Faults in Chepaizi region in the west of Junggar Basin are mainly high-angle normal ones with small fault displacements. There are mainly 4 fault types： late faults generated both deep and shallow, interzonal faults, late faults generated only shallow and early faults generated since the early Hercynian. The study region is mainly of bar and bank facies lithologic traps. Fault migration is the key for hydrocarbon accumulation. According to stress analysis, synthetic fuzzy judgment and nonlinearity representation, 6 important faults in the region are evaluated with 2 shale smear factor methods. Sealing studies are done in the fault in the south of Well Pal 208 and the fault in the east of Well Pal 17. The faults work as effective sealing in the Taxihe Formation, characterized by opening down and closing up. There are both passages and top sealing for hydrocarbon. The studies have provided useful information for hydrocarbon exploration and got good industry reserves in the region.