不整合面在油气藏形成中的作用

Role of surface of unconformity in formation of oil or gas reservoirs

不整合面不仅可以使已形成的油气藏遭到破坏 ,而且在一定程度上对油气藏的形成起到重要作用 .通过理论及实例分析 ,阐述了不整合面在油气藏形成中的重要作用 .不整合面的存在可使源岩发生二次生烃作用 ,不整合面可改善其上下地层储集空间和性能 ,也可作为油气侧向运移通道 ,导致不同层系的油气聚集 .不整合面的存在可提供潜山型、地层剥蚀型和地层超覆型 3种圈闭 。

The existence of unconformity surface can not only destroy oil or gas reservoirs, but also play an important role in formation of oil or gas reservoirs to some extent. By theoretical analysis and actual examples, this paper discusses the important role of unconformity surface in formation of oil or gas reservoirs. The existence of unconformity surface can make sourcerock generate secondary hydrocarbon, improve space and performance of reservoir of strata that are located in upper and lower part of it. As a lateral migration path of oil or gas, the existence of unconformity surface can lead to oil or gas accumulation from different oil or gas layers. The existence of surface of unconformity provides three kinds overlap traps of buried hill, stratagraphic denudation and stratagraphic for oil or gas to accumulate.