高邮凹陷油气输导体系评价研究

Evaluation of petroleum migration system in Gaoyou Sag

研究认为,高邮凹陷不同构造带表现出不同的油气输导样式:斜坡带油气输导体系以骨架砂体为主,断层、辉绿岩变质带为辅,主要为骨架砂体—断裂阶梯状输导,油气运聚模式以侧向运移聚集为主;深凹带油气输导体系以断层为主,骨架砂体与不整合面为辅,构成断裂—砂体垂向输导和断裂—不整合侧向输导,油气运聚模式以垂向运移聚集为主。不同储层特征下的油气运移特征不同,戴一段、阜三段(E2d1、E1f3)储层非均质性强,油气优先沿砂岩较发育带运移。E1f1储层均质性强,其油气主要沿构造脊运移。断层在油气运聚中起决定性的作用。

It is considered that the migration system of Gaoyou Sag in different structural belts shows different pattern.For slope region migration system,sand body is primary,fault and metamorphic zone near diabase are secondary.In this kind migration system,oil and migration accumulation mode gives priority to lateral mode.For passage system in deep sag region,faults is primary,reservoir sand and unconformity surface are secondary.In this kind migration system,oil and migration accumulation mode is subject to vertical mode.Petroleum migrating characteristics differ with reservoir charateristics.Petroleum prefers to migrate along sandrock developing zone due to greater heterogeneity of sand bodies in E2d1 and E1f3.However,E1f1 bears strong homogeneous reservoir to result in most petroleum migrating along structure ridge.The faults play a decisive role in petroleum migration and accumulation.