丽水凹陷油气成藏分析

HYDROCARBON ACCUMULATION PROCESS OF LISHUI SAG

油气成藏分析是确定沉积盆地油气资源和勘探部署的重要研究内容之一。我们从有机包裹体研究入手,结合成藏作用模拟,分析丽水凹陷油气运聚成藏过程。包裹体分析结果表明该区油气主要运聚成藏期为E2末期,新近纪至现今也有一定的油气运聚。通过成藏作用模拟,认为该区油气主要运聚成藏期可分为3期:E1、E2和 N—Q。根据成藏特点,将该区划分出 4 种主要成藏模式,即凹中《嗥诔渥⒃推爻刹啬Ｊ健⒍伟嘉餍逼略推爻刹啬Ｊ健⑽鞔伟嘉餍逼略推爻刹啬Ｊ胶颓巢愦紊推爻刹啬Ｊ健Ｍ?从油气生成、运聚、成藏特点出发,将该区划分出下部异常压力和上部正常压力成藏系统。不同成藏系统有较大的差异。

Hydrocarbon accumulation analysis is very important for us to calculate the resource of a sedimentary basin. For Lishui sag, the authors begin such work from organic inclusions and hydrocarbon accumulation modeling. According to the results of the organic inclusions analysis, we know that the hydrocarbon mainly migrated and accumulated in the end of Paleogene. The simulation of the hydrocarbon pooling tells us that there are three hydrocarbon accumulation periods, that is, E 1 , E 2 and N Q. According to the accumulation characteristics, the study area mainly has four pooling models and two pooling systems (abnormal pressure in the deep position and normal pressure in the upper). There are great differences in the different pooling system.