断层形态及其封闭特征对油气成藏的控制作用

本文通过断层精细解释与三维模拟技术结合应用,分析油气优势运移路径,建立充注层优选模式,进一步细化、深化油藏动力学理论研究。三维模型显示断层面形态存在多样化,整个断面对储层的封堵性也存在差异,针对断面三维要素及流体运移势能特征分析,研究断层疏导油气的最优势通道,并通过断面封闭性分析论述断层对油气向储层注入的控制作用。油气运聚成藏过程受断层面形态及其横向封闭、开启状态控制,油气在势能约束下沿断层面优势路径向上运移,只有路过储层处于开启段,为油气充注入口,且势能较入口低的位置也存在开启段,为储层流体出口,在势能差的作用下,油气才会规模性的进入储层,油气在密度差异作用下向构造高部位聚集成藏,建立了断层开启段组合、油气优势运移路径沟通的"高势进,低势出"油气充注模式。本次研究创新性对断层面结构要素开展三维研究,应用流体势分析方法,识别出断层疏导油气的优势路径,同时提出"高势进,低势出"的油气充注模式,对油气勘探开发具有重要的指导意义。

Control effect of fault morphology and its sealing characteristics on hydrocarbon accumulation

Based on the application of fault fine interpretation and 3 D simulation technology,this paper analyzes the advantageous migration path of oil and gas,and establishes the optimization mode of charging layer,to further refine and deepen the theoretical research of reservoir dynamics.The fault plane is diversified in shape, and also different in plugging property of the reservoir. Applying the fluid potential method to establish equipotential map of fault plane and reservoir, and under the guidance of potential energy, oil and gas migrate along the best channel. This paper is combined with examples of reservoir, the control effect of the plugging difference along the cross section in optimization of the oil and gas filling layer is discussed.Oil and gas migration and accumulation process is affected by the fault plane form and transverse closed or open state.Oil and gas, in the energy constrained, migrate upward along the fault plane edge path.Only when passing reservoir is in the open section, as the filling entrance oil and gas, and a low potential entrance position is opened as outlet of the reservoir fluid, so that under the effect of potential energy difference, oil and gas will enter the reservoir in a large scale and gather into the high part of the structure. Oil and gas accumulate to high structural parts under the action of density difference, and established "high potential entry and low potential outflow" oil and gas filling mode,through fault opening segment combination.Oil and gas dominant migration path communication.The innovation of this research is to carry out three dimensional research on the structural elements of the fault plane, and apply the fluid potential analysis method,identifying the advantages of ease of oil and gas path fault, and putting forward the "high potential entry and low potential outflow " oil and gas filling mode, and has important guiding significance for the further exploration and development of oil and gas.