南堡凹陷油气成藏的有利地质条件

在含油气盆地不同级别、不同类型、不同作用形式的界面中,石油地质研究中关注最多的是与含烃流体生、排、运、聚有关的不同新生流体的作用界面。在对断陷盆地生排烃、超压、次生孔隙发育、耗水等界面定义、特征及作用方式分析的基础上,以济阳坳陷东营凹陷为例,提出了断陷盆地成藏作用面的概念,初步定义为盆地新生流体运动过程、能量形式及其相互耦合的作用面,是生排烃、超压、次生孔隙发育、耗水4种界面耦合作用的结果,既是流体作用转换面、不同类型储集空间分界面,也是流体不同类型能量转换面和油藏类型分布转换面。成藏作用面通过对断陷盆地不同类型流体势能分布及叠加的控制作用,影响了不同类型油藏分布特征,因此通过对不同类型流体作用面的识别、研究和评价,能够有效预测油藏类型、分布样式,进而有效预测盆地油藏的丰富程度,对于盆地评价具有重要意义。

Favorable geological conditions for oil and gas accumulation in Nanpu depression

For the interface of different levels, different types, and different acting modes in petroliferous basins, what the petroleum geology study concern most is the different neogenic fluid action interface related to the hydrocarbon fluid generation, expulsion, migration, and accumulation. On the basis of definitions, characteristics, and mode of action analysis of interfaces which includes hydrocarbon generation, hydrocarbon expulsion, the overpressure, secondary pore development, water consumption, this paper presents reservoir-forming acting surface of rift basins. The reservoir-forming acting surface of rift basins is the reflection of coupling of basin neogenic fluid movement process, energy formation and its action mechanism. It is the result of 4 interface coupling that is not only the turnaround surface of fluid process and interfaces of different reservoir spaces, but also the turnaround surface of different energy and reservoir type distribution. Through the control of different fluid potential distribution and superimposition, different reservoir distribution features are affected. By means of identification, research and evaluation of different fluid acting surfaces, the reservoir types and distribution patterns can be predicted effectively. Thus, the reservoir richness of basin can be predicted. It is of great significance for basin evaluation.