以库车坳陷克拉2气田为例,研究挤压背景异常压力与油气成藏的关系。大规模抬升早期阶段是天然气注入的主要时期,同时也是气藏压力急剧增加的时期。克拉2气藏的成藏模式总体为深大断裂沟通储集层和烃源岩层,在深部超压的驱动下油气运移至储集层成藏。储集层在成藏早期不是强超压,并且不完全封闭,可以存在流体排出过程。随着天然气替换构造圈闭中的地层水和成岩作用逐渐进行,储集层封闭性加强,气藏压力不断升高,最后形成超压气藏,气藏强超压形成于距今2Ma以来。异常高压与气藏的形成均是构造作用和保存条件演化的结果,二者本身不具备因果关系。气源断层与盖层完整的匹配是控制天然气成藏的关键因素。图4参16
The paper analyzes the relationship between abnormal overpressure and gas pool formation in the tectonic compression environment, taking the Kela 2 gas field of Kuqa Depression as an example.In the earlier cosmic elevating,most gas is injected into pool and the pressure of gas accumulation rises rapidly.The hydrocarbon accumulation model of Kela 2 is that the reservoir and source rocks are communicated by faults,and oil and gas driven by superpressure migrate into reservoir and accumulate.In the earlier acc... |