内蒙古东北拉布达林盆地上库力组烃源岩生烃潜力分析

Hydrocarbon-generating Potentials of Source Rocks of Shangkuli Formation in Labudalin Basin, Northeastern Inner Mongolia

应用有机岩石学、热解分析等地球化学分析技术,对拉布达林盆地下白垩统上库力组一段烃源岩进行干酪根元素分析、岩石热解分析和高温高压热模拟实验。探讨了拉布达林盆地下白垩统上库力组一段烃源岩的显微组分、有机质丰度、类型和成熟度等特征,分析了其生烃潜力和生烃属性。将上库力组一段烃源岩显微组分划分为壳质组、镜质组和惰质组3种类型,其中,壳质组中来源于水生生物的腐殖无定形体含量很高（94%～97%）,有利于生油;有机质丰度较高,达到中到好的级别;烃源岩有机质类型较好,主要为II1型和II2型;有机质热演化程度较低,主要处于生油的低成熟阶段。结果表明,拉布达林盆地上库力组一段烃源岩具备较好的生油潜力,具有很好的油气勘探前景。

The organic macerals of kerogen, with an abundance of organic matter, the maturity and the type of source rocks during the one group of Shangkuli Formation, lower Cretaceous in Labudalin Basin are discussed, based on the analytic technique of organic lithology and Rock-Eval analyses. Also discussed is the hydrocarbon generating potentials and features by element analyses on kerogen, Rock-Eval analyses and high temperature and pressure simulation on source rocks. The results show that the organic macerals of one group of Shangkuli formation source rock in Labudalin Basin are classified into 3 groups as follows： exinite, vitrinite and inertinite. The sapropel as an important oil generating component is the result of bacteria degrading algal. The content of the sapropel reaches 94%～97%. The organic materials of source rock are rather highly abundant, and the organic materials take type II1 or II2 kerogen as the dominant factor. The thermal evolutions of the most organic matter have reached a low maturation stage, and the organic matter mainly generates oil. The source rocks of Labudalin Basin with good oil generating potentials have very good prospect for petroleum exploration.