论油气成藏系统及其划分原则与地质意义

THE CONCEPT,DIVIDING PRINCIPLE AND GEOLOGICAL SIGNIFICANCE OF RESERVOIR-FORMING SYSTEM

油气成藏系统与含油气系统是两个不同的概念,两者既有区别又有联系。研究认为,油气成藏系统是一个相对独立的油气运移、聚集地质单元,包括同一运聚系统内相关的有效烃源岩、输导体系和油气藏以及油气藏形成所需要的一切地质要素和作用。油气成藏系统划分的依据是控制油气运移聚集的主要运载层成藏期古流体势的高势面和有效输导体系的展布特征等。成藏系统分析对高勘探区油气资源评价和成藏组合评价具有重要实用价值。油气成藏系统的研究应首先进行成藏系统的划分,再在纵向上分系统进行成藏组合的划分与评价。以东营凹陷博兴洼陷为例,将其划分为5个油气成藏系统,各油气成藏系统又分别划分出下、中、上三套不同的成藏组合;对各成藏系统、不同成藏组合的成藏特征进行了分析和总结,对各成藏系统的勘探潜力和勘探方向进行了评价和预测。

Reservoir-forming system(RFS) is different from Petroleum system in concept,but there is a little connection between them.Researches proved that RFS is a relatively independent geological unit of petroleum migration-accumulation,including the effective hydrocarbon source rock,transportation system,pool of the same migration-accumulation system and all the geological factors and actions what reservoir forming needs.The division foundation of RFS is the high potential energy level of the ancient fluid potential in reservoir-forming period of the main carrier bed which controls the migration and accumulation of oil and the distribution characteristics of the effective transportation system,etc.For the petroleum resource and reservoir-forming combination evaluation of high exploration area,the RFS analysis is of great practical value.The research on RFS should divide the system firstly,then divide and evaluate the reservoir-forming combinations for each system in vertical.The thesis divides Boxing subsag into five reservoir-forming systems and each system includes three different combinations.Finally it analyzes and summarizes the reservoir-forming characteristics for different systems and combinations,and evaluates and forecasts the exploration potential and direction for all the systems.