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塔里木盆地库车坳陷东部地区存在三叠系和侏罗系2套烃源岩,二者沉积环境和母质类型相似,如何对这2套烃源岩进行判识一直是地球化学研究所面临的一个难题。通过利用烃源岩热模拟轻烃在线分析技术,对库车坳陷东部三叠系和侏罗系烃源岩进行了轻烃热模拟分析。研究发现,库车坳陷东部三叠系和侏罗系烃源岩成因类型相似,均为典型的陆相煤系烃源岩,并且可以依据支链烷烃和芳香烃相对百分含量对这2套烃源岩进行判识,三叠系支链烷烃相对百分含量主要介于28%~38%之间,而侏罗系支链烷烃相对百分含量主要介于10%~27%之间,三叠系芳香烃相对百分含量主要分布在5%~25%范围内,而侏罗系芳香烃相对百分含量主要分布在20%~65%范围内。研究成果对于库车坳陷东部地区油气成藏理论研究和勘探生产部署具有重要的指导意义。
There are two sets of Triassic and Jurassic source rocks in the eastern Kuqa Depression of the Tarim Basin. Both sedimentary environments and parental types are similar. How to identify these two sets of source rocks has always been the subject of geochemistry A problem. Hydrocarbon heat simulation of Triassic and Jurassic source rocks in eastern Kuqa Depression has been carried out by using on-line thermal analysis of hydrocarbon light source rocks. It is found that the genetic types of Triassic and Jurassic source rocks in eastern Kuqa Depression are similar and are typical continental coal-based source rocks. According to the relative percentages of branched-chain alkanes and aromatic hydrocarbons, The relative percentage of branched-chain paraffins in Triassic is mainly between 28% -38%, while the relative percentage of branched-chain paraffins in Jurassic is mainly between 10% -27%. Third, The relative percentage of aromatics is mainly distributed in the range of 5% ~ 25%, while the relative percentage of aromatic hydrocarbons in the Jurassic is mainly distributed in the range of 20% ~ 65%. The research results have important guiding significance for the theoretical study of oil and gas accumulation in eastern Kuche Depression and exploration and production deployment.