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根据烃源岩生烃动力学参数,结合沉积埋藏史和古热史资料,本文应用生烃动力学方法研究了塔里木盆地库车坳陷三叠-侏罗纪烃源岩生烃史。研究表明,无论是煤,还是泥岩,库车坳陷三叠-侏罗纪烃源岩生气时间发生得晚,主生气期出现在10 Ma以来的喜山期晚期,生气高峰期出现在5 Ma之后。中上三叠世烃源岩生气时间和主生气期均早于中下侏罗世烃源岩。烃源岩这种晚期生气特征,为库车坳陷天然气的晚期聚集成藏提供了非常有利的烃源条件。
According to the hydrocarbon generation kinetic parameters of the source rocks, combined with the buried and burial history and paleothermic history data, the hydrocarbon generation history of the Triassic-Jurassic source rocks in the Kuqa Depression of the Tarim Basin was studied by hydrocarbon generation kinetics. The study shows that the gas-generating time of the Triassic-Jurassic source rocks in the Kuqa Depression occurred late in both coal and mudstone, and occurred in the late Himalayan period from 10 Ma in the main gas-producing period to 5 Ma after that. The gas generation time and main gas generation period of the Middle-Upper Triassic source rocks were earlier than those of the Middle-Lower Jurassic source rocks. The late gas-forming characteristics of source rocks provide a very favorable hydrocarbon source condition for the late accumulation of natural gas in the Kuqa Depression.