柴达木盆地柴北缘侏罗系烃源岩特征分析

The Evaluation of Jurassic Hydrocarbon Source Rock in North Margin of Qaidam Basin

柴北缘侏罗系烃源岩主要发育在中、下侏罗统。根据有机碳及岩石热解、干酪根镜检等资料,从成烃的角度对柴北缘侏罗系烃源岩进行了评价。结果表明,柴北缘侏罗系烃源岩厚度大,分布范围广;烃源岩有机质丰度较高,大部分烃源岩为中等-好烃源岩;有机质类型主要为Ⅱ型,生烃潜力大;柴北缘侏罗系烃源岩演化处于低熟-成熟阶段,表明该区具有良好的油气勘探前景。

The source rocks of Jurassic north margin in Qaidam Basin mainly develop in the middle and early Jurassic.In this thesis,based on the geochemical data of organic carbon,rock pyrolysis and microscopic examination of the kerogen,the hydrocarbon source rocks in the longitudinal and transverse distribution are analyzed,organic matter abundance,type and maturity and Jurassic hydrocarbon source rocks in the north margin of Qaidam Basin are evaluated.The results show that the hydrocarbon source rocks in the study area have large thickness and extensive distribution range;also the most of high abundance of organic matters are the medium or good hydrocarbon source rocks;organic matter type is mainly of TypeⅡ;evolution of source rocks is at the low maturity and maturity stage,all indicate that the area has good prospects of oil and gas exploration.