准噶尔盆地东部吉木萨尔凹陷复合含油气系统特征及其演化

准噶尔盆地东部吉木萨尔凹陷及博格达山前凹陷发育3个含油气系统，3个含油气系统在形成过程中共享某些成藏地质条件，构成一藏多源、一源多藏的复合含油气系统。各含油气系统多期生烃、成藏和改造时刻构成复合含油气系统的多个关键时刻。复合含油气系统油源充足，成藏条件匹配良好，形成几个有利的油气聚集带。区域构造演化对烃源岩演化、复合含油气系统的形成有一定的控制作用。

Characteristics and Evolution of the Composite Petroleum System in Jimsar Depression, Eastern Junggar Basin

There exist three petroleum systems in Jimsar depression of eastern Junggar Basin and its adjacent Bogda piedmont depression. They together shared hydrocarbon pool-forming conditions and formed a composite petroleum system. An analysis of characteristics and evolution of source rocks and petroleum systems suggests that, with fairly good matching of pool-forming conditions, the composite petroleum system is petroliferous. Multi-source and multi-phase hydrocarbon generation and multi-phase pool formation of every petroleum system restrict the critical moments of the composite petroleum system. Having pointed out advantageous hydrocarbon-bearing units, this paper deals with the relationship between the regional tectonic evolution and the formation of the composite petroleum system.