恩平凹陷南部隆起带油气成藏模式

南部隆起带是恩平凹陷的主要成藏带。利用基础资料, 系统分析了南部隆起带油气成藏的条件与特征, 总结了南部隆起带油气成藏的模式。恩平凹陷南部隆起带油气主要来自北侧EP17洼始新统文昌组中深湖相烃源岩, 南部隆起带之下缺失文昌组沉积, 存在油气的有利仓储区, 油气通过沟通有利仓储区的断裂运移, 主要有仓上-上盘诱导裂缝带垂向输导-连通砂体侧向输导-滑动破碎带侧向封堵-断块油气藏、仓上-上盘诱导裂缝带垂向输导-连通砂体侧向输导-它源自圈背斜油气藏以及仓上-下盘诱导裂缝带垂向输导-连通砂体侧向输导-滑动破碎带侧向封堵-断鼻油气藏3种成藏模式。 

RESERVOIR-FORMING PATTERN OF THE SOUTH UPLIFT IN ENPING SAG

The south uplift is the main hydrocarbon accumulation-forming zone of Enping sag. Using the basic data, we analyzed the conditions and characteristics of hydrocarbon accumulation in the south uplift and summarized the pattern of hydrocarbon accumulation. Hydrocarbon in the south uplift of Enping sag is mainly generated from the deep lacustrine source rock in Eocene Wenchang formation in the north EP17 sag. Although the south uplift lacks Wenchang formation deposits, there exists hydrocarbon favorable storage area. Hydrocarbon migrates mainly along the fractures which connect the favorable storage area. There are three patterns of hydrocarbon accumulation model:vertical migration along induced fracture zone of upper storage area and hanging wall, lateral migration along connected sand bodies, lateral sealing by gliding fracture zone, fault block reservoir; vertical migration along induced fracture zone of upper storage area and hanging wall, lateral migration along connected sand bodies, anticline reservoir trapped from other sources; vertical migration along induced fracture zone of upper storage area and footwall, lateral migration along connected sand bodies, lateral sealing by gliding fracture zone, fault nose reservoir.