网毯式油气成藏体系的动态平衡研究

Dynamic balance analysis of meshwork-carpet type oil and gas pool-forming system

根据动态平衡的概念,对东营凹陷网毯式体系中的结构、油气的输导、仓储和成藏的过程进行了研究。研究结果表明,仓储层作为连接油源通道网层和油气聚集网层的枢纽,对来自油源通道网层的油气起到临时的仓储作用。一部分油气通过仓储层的输导,在上部网层聚集成藏,另一部分油气可在仓储层中聚集成藏。仓储层输导和聚集油气是一个动态的过程,在某一个历史时期,它维持着油气运聚的动态平衡。在东营凹陷中、东部,仓储层发育,构造运动形成了多种空隙,并组成了多种类型的油气运移通道,故油气二次成藏的机会较多,是寻找他源隐蔽油气藏的重要区域,在今后的油气勘探中应引起足够的重视。

The mechanism and process of oil and gas migration and storage as well as generation of hydrocarbon reservoir in the meshwork-carpet type system in Dongying Depression were discussed using the dynamic balance theory. The results show that the storage layer is a channel for connecting the meshwork layer of oil source passage to the meshwork layer of hydrocarbon accumulation and also a temporary warehouse for oil and gas coming from the meshwork layer of oil source passage. A part of oil and gas pass through the storage layer and may be accumulated in the upper meshwork layer, and the remaining oil and gas may be accumulated and form hydrocarbon reservoirs in the storage layer. The oil and gas transmission and accumulation process in the storage layer has dynamic performances. In a certain period, this process abides by the dynamic balance theory in the course of hydrocarbon migration and accumulation. There developed storage layer in the east-central area of Dongying Depression, and the structural movements caused various channels for oil and gas migration. So there is an extremely high possibility for generating secondary hydrocarbon reservoir. This area is the important field for finding secondary hydrocarbon reservoir and should be paid more attention in the future petroleum exploration.