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库车坳陷存在上三叠统黄山街组(T3h)和中侏罗统恰克马克组(J2q)两套湖相油源岩,从三个方面研究了这两套油源岩现今成熟度分布及其在地质历史中的演化:一是对钻孔和露头剖面两套油源岩样品镜质组反射率实测分析;二是从中下侏罗统煤系源岩,特别是煤中镜质组反射率实测数据限定分别位于中下侏罗统(J1y和J2k)煤系地层上下的两套油源岩的有机成熟度;三是从地层分层数据和地温史对人工井(中)两套油源岩成熟度的模拟分析。库车坳陷黄山街组和恰克马克组露头剖面油源岩镜质组反射率自东向西总体上呈现明显的增高趋势,在东部基本上处于临界成熟—成熟阶段,而西部则处于凝析油—湿气阶段或干气阶段。库车坳陷黄山街组油源岩主要生油阶段位于65～5Ma,生油高峰约在23～12Ma,油源灶最早(约65Ma)出现在坳陷西部,不断向东部扩展;恰克马克组湖相油源岩主要生油阶段位于12Ma至现今,生油高峰约在5～2Ma,油源灶最早(约12Ma)出现在拜城凹陷腹部,后向四周扩展。
There are three sets of lacustrine source rocks in the Upper Triassic Huangshanjie Formation (T3h) and the Middle Jurassic Chukak Formation (J2q) in the Kuqa Depression. The maturity of these two sets of source rocks is studied from three aspects Distribution and its evolution in geological history: one is to measure the vitrinite reflectance of two sets of oil source rocks in borehole and outcrop profile; the other is from the source rocks of Middle-Lower Jurassic coal series, especially the coal The measured reflectance data of the group define the organic maturity of two sets of source rocks above and below the Lower Jurassic coal measures (J1y and J2k) respectively. Third, Simulation Analysis of Set Maturity of Oil Source Rocks. The reflectivity of the source rocks in the Huangshanjie Formation and the Chakemark Formation outcrop section of the Kuqa Depression shows a clear trend of increase from east to west, basically in the critical mature-maturity stage in the east and in the west Oil - wet or dry gas phase. The source rock of the Huangshanjie Formation in the Kuqa Depression is located at 65 ~ 5Ma and the peak of oil generation is about 23 ~ 12Ma. The earliest source oil pool (about 65Ma) appears in the western part of the depression and continues to expand eastwards. The main oil-producing stage of the lacustrine source rocks is located in the 12Ma up to now, the peak of oil generation is about 5 ~ 2Ma, and the earliest source of oil (about 12Ma) appears in the belly of the Baicheng Depression, and then expands to the periphery.