论文部分内容阅读
孤南洼陷是渤海湾盆地济阳坳陷内的一个洼陷，根据其烃源岩特征，油气成藏演化与分布特征，可以划分出两个油气成藏系统，即成藏系统Ⅰ和成藏系统Ⅱ。成藏系统Ⅰ以沙河街组三段为烃源岩，从东营组末期开始进入生烃门限，目前处在成熟阶段，储集岩从基底中生界直至馆陶组都有分布；成藏系统Ⅱ以沙河街组一段为烃源岩，自馆陶组末期进入生烃门限，目前处于低成熟阶段，储集岩主要分布在沙河街组二段、沙河街组一段及东营组。尽管两个系统的油源区基本重叠，但油气的性质和空间分布有很大差别。成藏系统Ⅰ的范围可以从洼陷内部延伸到周围的突起，成藏系统Ⅱ的原油主要聚集在洼陷内部。另外，两个成藏系统的油气运移、聚集方式也不同。成藏系统Ⅱ主要以侧向运移、侧向充注为主，形成单源油藏。成藏系统Ⅰ在i洼陷外围通过断裂带的垂向运移及垂向充注，可以形成混源油藏。这两个系统一方面是独立的，另一方面又被断层所关联，空间相互叠置，时间相互衔接。
The Lunnan Sag is a depression in the Jiyang Depression in the Bohai Bay Basin. According to the characteristics of source rocks and the evolution and distribution of hydrocarbon accumulation, two hydrocarbon accumulation systems can be distinguished: System Ⅱ. The reservoir system Ⅰ takes the third member of Shahejie Formation as source rock and enters the hydrocarbon generation threshold from the end of Dongying Formation. At present, it is in the mature stage. The reservoir rocks are distributed from the basement, Mesozoic to Guantao Formation. Ⅱ. Taking the first section of Shahejie Formation as source rock, it entered the threshold of hydrocarbon generation since the end of Guantao formation and is currently in low maturity stage. The reservoir rocks are mainly distributed in the second section of Shahejie Formation, the first section of Shahejie Formation and the Dongying Formation. Although the oil source areas of the two systems basically overlap, the nature and spatial distribution of oil and gas are greatly different. The reservoir system Ⅰ can extend from the interior of the depression to the surrounding protuberances. The crude oil of reservoir system Ⅱ mainly accumulates inside the depression. In addition, the migration and accumulation of oil and gas in the two hydrocarbon accumulation systems are also different. Reservoir system Ⅱ mainly lateral migration, lateral charge-based, the formation of a single source reservoir. Reservoir system I can form mixed source reservoirs by the vertical migration and vertical filling of the fault zone in the periphery of i depression. On the one hand, these two systems are independent, on the other hand, they are connected by faults, and the space is overlapped with each other and the time is connected with each other.