惠民凹陷临南斜坡带油气成藏模式

从构造及沉积背景出发 ,在对现今油气分布特征及成藏条件研究的基础上 ,对惠民凹陷临南斜坡带的油气成藏模式进行了研究。研究结果表明 ,临南斜坡带的油气富集主要受二级断裂、构造背景、油气运移期断层的活动强度和断层的封闭开启性所控制 ,临南斜坡带多种类型的油气藏有其特定的分布规律。在平面上 ,构造背景控制了油气富集区的形成 ;纵向上 ,馆陶组油气藏主要分布于边缘地层不整合面附近 ,沙河街组油气藏主要分布于斜坡的断阶带内。在斜坡的边缘以稠油、超覆、不整合油气藏为主 ,斜坡中部以断块油气藏为主 ,斜坡近洼陷部位则以断鼻油气藏为主。根据分析结果建立了临南斜坡带的两种油气成藏模式

Pool-forming models of Linnan slope belts in Huimin depression

The tectonic and sedimentary characteristics of Linnan slope belts were investigated. The oil gas accumulation was controlled by the factors of two level fault, tectonic features, as well as the fault activity, fault sealing and opening properties during oil and gas migration. There exist some distinct distribution laws of oil gas reservoirs in Linnan slope belts. The formation and distribution of oil and gas reservoirs were controlled with the tectonic features in plane, and oil gas reservoirs of Guantao formation were centered on the stratigraphy unconformity surface of steep slope belts. The oil and gas reservoirs of Shahejie formation were centered on the fault bench of slope belts. In general, the oil gas reservoirs include the types of heavy oil, overlap and unconformity oil gas reservoirs. There are faulted oil gas reservoirs in center, and there are faulted nose oil gas reservoirs near the slope depression. Two kinds of hydrocarbon pool forming models are established on the analysis result.