济阳坳陷孤南洼陷油气生成与聚集规律

孤南洼陷是渤海湾盆地济阳坳陷内的一个洼陷，该洼陷具有很好的油气成藏条件。洼陷内发育沙三段和沙一段两套良好的生油岩，同时它们又是区域盖层。储集居主要包括第三系碎屑岩和中生界火山碎屑岩。本区圈闭多与断层有关，圈闭的形成与油气的运移聚集有良好的配置关系。两套生油岩分别对应着两个成藏期。根据两套生油岩，两个成藏期可以识别出两个油气成藏系统，两个成藏系统的油气形成与分布规律不同，它们既相互独立，又通过断层和不整合联结。断层对本区油气藏的分布起控制作用，靠近洼陷中心的边界断层是油气富集的主要地区，同时也是勘探远景区。

Petroleum Generation and Accumulation in the Gunan Sag,Jiyang Depression

Being located in Jiyang Depression, Bohai Bay Basin, the Gunan sag has favorable conditions for petroleum generation and accumulation. The third and first members of Shahejie Formation provide excellent source rocks, as well as regional seal rocks. The Tertiary clastic rocks and Mesozoic volcaniclastic rocks are reservoir rocks. Traps are mostly related to faults. Petroleum migrated and accumulated at the same time of (or) after most traps' formation stage. The two source rock beds have different hydrocarbon generation history and different accumulation periods. Based on the two source rock layers and two generation-migration periods, two accumulation systems have been identified. Characteristics of petroleum generation and distribution in the two systems are different. The two systems are relatively independent, yet they could be connected by faults and unconformities. Faults play a key role in hydrocarbon accumulation since most pools discovered are located near the marinal faults. So the marginal fault belts are prospective areas for further exploration.