车拐地区侏罗系岩性油气藏形成条件及主控因素

The formation conditions and main controlling factors of Jurassic lithologic reservoirs in Cheguai area,Junggar Basin

近年来,按照断块油气藏的思路,车拐地区侏罗系油气勘探进展缓慢。通过断裂体系和沉积体系的分析,该区侏罗系具备地层岩性油气藏形成条件。为了更好地指导该区油气勘探,深刻剖析岩性油气藏的主控因素,认为:古凸起高部位有利于形成地层圈闭,近东西向的断裂与南北向的沉积体系和东南倾的鼻状构造相配置,有利于形成断层-地层、断层-岩性圈闭;低位域的八道湾组和高位域的三工河组是最有利的勘探层位;坡折带之下的三角洲前缘是最有利的岩性油气藏发育区;疏导体系是控制古生新储型岩性油气藏形成的关键因素。

The progress of oil reservoir exploration in Cheguai area is slow according to the exploration strategy of fault block reservoirs in recent years. Based on the analysis of sedimentary system and fracture system, the Jurassic in the area is favorable for forming lithologic reservoirs. The result indicated that the high point of palaeohigh is favorable for stratigraphic trap formation, and the combination of sub latitudinal fault, longitudinal sedimentary system and nose-shaped structure turning northwest are good for forming fault-stratlgraphic trap and fauh-lithologic trap; Badaowan Formation of LST and San＇ gonghe Formation of HST are the most prospecting formations; delta front below slope break belt is the most favorable area; translocation system is the dominant factor for the forming of Jurassic lithologic reservoirs.