吉拉克三叠系凝析气藏成藏地球化学研究

根据油气藏地球化学方法，对吉拉克三叠系凝析气藏的成藏进行了研究。天然气组成和凝析油轻烃研究表明吉拉克三叠系凝析气藏的天然气和凝析油都为腐泥型来源，凝析气藏为气侵形成的凝析气藏；储层沥青研究表明烃源岩不仅仅只有中上奥陶系烃源岩，还有寒武系烃源岩。结合工区构造发展史等基础资料，认为吉拉克三叠系油气藏经历了三期油气聚集和一次破坏，凝析气藏最终由于喜山期地层反转，天然气发生再分配而形成。

The Geochemical Study of Forming Condensate Pool in Triassic in Jilake

Based on the method of reservoir geochemistry, the formation of the condensate pool in Triassic in Jilake has been studied. By the study of gas compostion and the light carbon in condensate oil, it is suggested that the source of gas and condensate oil are sapropelic, and the condensate gas was formed by dry gas entering the oil. The study of reservoir bitumen showed that the source is not only the carbonate in middle and late ordovician, but also the carbonate in cambrian. The process of condensate pool formation is analyzed in detail. It is concluded that there are three periods in acculumation and one period in destroy in the process of condensate pool formation. The strata was reversed in Himalayan, and then the gas redistribution was formed the condensate pool.