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塔里木盆地孔雀河地区寒武—奥陶系烃源岩分布广泛,厚度由东北向西南逐渐增大,累计最大厚度达4 000余米,寒武系—下奥陶统烃源岩有机质处于高成熟-过成熟阶段,中上奥陶统烃源岩有机质处于成熟-高成熟阶段.在剥蚀量和古地温研究基础上,通过单井埋藏史与古地温曲线的叠合,总结出孔雀河地区寒武—奥陶系烃源岩的生烃史,共3类7型:第一为二次生烃类,按进入二次生烃时间可进一步分为三型;第二为持续生烃类,按埋藏史可再分为两型;第三为下部过成熟类,按达到过成熟温度(240℃)的时间可进一步分为两型.在所划分的3类7型中只有底部过成熟二型属于不具备生排烃能力的无效烃源岩,这一结果扩大了本区的油气资源前景.
The Cambrian-Ordovician hydrocarbon source rocks in the Kongquehe area of Tarim Basin are widely distributed, and their thickness increases from northeast to southwest. The accumulated maximum thickness reaches more than 4000 meters. The organic matter of the Cambrian-Lower Ordovician source rocks is highly mature - During the maturity stage, the organic matter of the middle-upper Ordovician hydrocarbon source rocks are in mature-high maturity stage.Based on the study of denudation and paleotemperature, through the superposition of the single-well burial history and paleotemperature curve, Wu - Ordovician hydrocarbon source rock history, a total of three types of 7: the first secondary hydrocarbon generation, according to the secondary hydrocarbon generation time can be further divided into three types; the second for the continuous generation of hydrocarbons, According to burial history can be divided into two types; the third is the lower over-mature class, according to the time reached the ripening temperature (240 ℃) can be further divided into two types. Type belongs to an invalid hydrocarbon source rock that does not have the capacity of hydrocarbon generation and expulsion, and this result has widened the prospect of oil and gas resources in this area.