准噶尔盆地乌伦古坳陷东部南斜坡油气来源分析

Oil-source Analysis in South Slope of Eastern Wulungu Depression,Junggar Basin

乌伦古坳陷存在侏罗系、三叠系和石炭系3套烃源岩,其中侏罗系烃源岩为未熟烃源岩,三叠系和石炭系为成熟烃源岩。油源分析结果表明滴北1井油气源自石炭系烃源岩。在此基础上,对研究区构造和石炭系烃源岩演化进一步分析后认为,该区圈闭的形成期与石炭系烃源岩的生排烃期匹配关系较好,石炭系烃源岩是该区最有利的一套烃源岩。

Three series of source rocks occur in the Jurassic, the Triassic and the Carboniferous in Wulungu Depression. The Jurassic is a immature source rock, and the Triassic and the Carboniferou are mature source rocks rich in organic matters, The oil-source analysis indicates that the crude oil in Dibei 1 Well derives from the Carboniferou source rock. Based on this viewpoint, the structure analysis and the Carboniferous source rock thermal evolution in this study area indicates that the trap closure period is well matched with the generation and expulsion period of the Carboniferou source rock, and the Carboniferou source rock is most favorable in this area.