塔里木盆地库车坳陷依南2气藏成藏期次研究

依南2构造位于新疆维吾尔族自治区塔里木盆地库车坳陷克-依构造带东段的依奇克里克背斜南部。通过天然气甲烷碳同位素、储集层有机包裹体均一温度、K-Ar同位素等方面的研究及其与天然气藏成藏过程关系的研究，确定了依南2侏罗系气藏的形成期次和过程，建立了气藏的成藏模式。依南2气藏的形成是一个连续过程，天然气藏的形成经历了早期有机包裹体形成和后期气藏形成两个阶段。天然气注入开始于吉迪克末期-康村期，该阶段是包裹体形成的主要时期。康村中期以后可能是气藏形成的主要时期。气源岩天然气进入储集层的排烃方式是直接排气，进入储集层形成气藏。天然气运移距离短，散失少；并有良好的煤系泥岩作为盖层，保存条件好；因而形成了依南2侏罗系气藏，原生气藏的主要控制因素是储集层的物性。

POOL-FORMING TIME OF GAS RESERVOIR IN YINAN 2 TRAP OF KUQA DEPRESSION IN TARIM BASIN

The methane carbon isotope of natural gas, fliud inclusion homogeneous temperature and Kalium Argon isotope of autogenetic illite of sandstone reservoirs are studied. The time and process of Jurassic gas pool formation of Yinan 2 trap are determined. It is put forward that the gas pool formation of Yinan 2 was a continuos process and underwent two main stages: the inclusion formation in earlier period and gas pool formation in late period. The natural gas began to charge from Jidike to Kangcun stage that was the main time of inclusion formation. The gas reservoir was mainly formed after the middle Kangcun period. The natural gas migrates from the source rock into the sandstone by direct expulsion. Research shows that the gas pool of Yinan 2 is formed due to many factors of short migrating distance, little dessipating, excellent caps and good preserving condition. In conclusion, the time and the process of pool formation in Yinan 2 trap are advantageous to the primary gas reservoir in the Kuqa Depression. The crucial factor of the gas reservoir is the properties of reservoirs.