库车坳陷北部山前带中生界烃源岩有机岩石学

应用全岩有机岩石学分析方法，对库车坳陷北部山前带中生界三叠系和侏罗系烃源岩的显微组分、主要富氢组分、有机质类型及热演化程度进行了研究。结果表明：库车坳陷北部山前带侏罗系克孜勒努尔组烃源岩显微组分总含量最高，恰克马克组烃源岩最低。中生界烃源岩显微组分组成具有镜质组含量高、壳质组和惰性组相对发育、腐泥组贫乏的特征。不同层位具有一定差异性，克孜勒努尔组和塔里奇克组中镜质组含量较高，恰克马克组壳质组相对发育。孢子体、壳屑体、角质体和藻类体是其主要的富氢组分，恰克马克组富氢组分相对含量最高。烃源岩有机质类型以Ⅲ型和Ⅱ2型为主，有利于生气，镜质组反射率Ro为056%~187%，热演化程度处于成熟-高成熟阶段。克拉苏—依奇克里克构造带冲断前缘烃源岩显微组分总含量与热演化程度均相对较高，为烃源岩的最大成熟生烃中心。烃源岩高生烃潜力与高的壳质组含量和低的陆源有机质含量有关。

Organic Petrology of Mesozoic Source Rocks in the NorthernPiedmont Zone of the Kuqa Depression

Using whole rock organic petrological analysis, the macerals, major hydrogen rich components, organic matter types and thermal evolution of organic matter in the Triassic Jurassic source rocks from the northern piedmont zone of the Kuqa depression are revealed. The results show that the total maceral content of the Jurassic Kezilenuer Formation source rocks is the highest in the northern piedmont zone, and that in the Qiakemake Formation source rocks is the lowest. The Mesozoic source rocks lack sapropelite, but are rich in vitrinite and relatively rich in exinite and inertinite. The maceral contents of these source rocks vary according to their respective formations.The vitrinite contents of the Kezilenuer and Qiakemake formations are relatively high, and exinite in the Qiakemake Formation is relatively well developed.It is suggested that sporinite, liptodetrinite, cutinite and alginate are the main hydrocarbon forming macerals, and the hydrocarbon forming maceral content in the Qiakemake Formation is the highest.Organic matter in the source rocks are mainly of Type Ⅲ and Ⅱ2, which are beneficial for gas formation. Thermal evolution level in these source rocks are in the mature and high mature stage,with the vitrinite reflectance (Ro) of 056% to 187%. The results show that the hydrocarbon forming center locates in the thrusting front of the Kelasu thrust belt, with the highest total maceral content and thermal evolution. High oil forming potential of hydrocarbon source rock is related to high proportion of liptinite macerals and low content of terrigenous organic matter.