南堡凹陷东一段油气成藏与分布的主控因素及模式

为了研究南堡凹陷东一段油气成藏规律,采用油藏解剖和油气分布与成藏条件之间空间匹配关系研究的方法,对其油气成藏的主控因素和模式进行了研究。结果表明:油源断裂是油气向东一段地层垂向运移的输导通道,东二段和馆三段2套盖层的合理匹配有利于油气聚集成藏,砂地比大于20%的区域有利于油气向东一段地层侧向分流聚集,油源断裂附近的正向构造是东一段地层油气聚集的有利部位。油气成藏模式为:下伏沙三段(或沙一段—东三段)源岩生成的油气沿油源断裂向东一段地层运移,在穿过东二段泥岩盖层且被馆三段火山岩盖层封闭的区域内,向砂地比大于20%的东一段地层侧向分流,最终在油源断裂附近正向构造上的断块、断层遮挡和断层-岩性圈闭中聚集成藏。

Main controlling factors and models of oil and gas accumulation and distribution of E d1 in Nanpu Depression

In order to study oil and gas accumulation lawof Ed1 in Nanpu Depression,the main controlling factors and models of Ed1 in Nanpu Depression were studied by research method of reservoir anatomy and matching relation between hydrocarbon distribution and accumulation conditions.The result shows that oil and gas accumulation and distribution are controlled by following four factors：（1） faults connected with source rocks are main transporting pathways oil and gasmigrating vertically toEd1;（2） the place where oil and gasmigrate through Ed2mudstone cap rocks,but sealed byNgⅢ volcanic cap rocks is favorable for oil and gas migrating intoEd1;（3） the places where the ratio between sandstone and stratum is more than 20% are favorable for oil and gas migrating laterally into Ed1;（4） positive structures near faults connected with source rocks are favorable place for oil and gas to accumulate.Oil and gas accumulation models of Ed1 are that oil and gas from underlying Es3 or Es1-Ed3 source rocks migrate along faults connected with source rocks into Ed1 in the places where oil and gas migrate through Ed2mudstone cap rocks but sealed by NgⅢ volcanic cap rocks,oil and gas migrate laterally into strata of Ed1 with the ratio between sandstone and stratum beingmore than 20%,accumulate in fault block,fault sealing and fault-lithology traps on positive structures near faults connected with source rocks and form oil and gas reservoirs.