特高含水期油藏剩余油分布影响因素研究

根据特高含水期剩余油形成机理和类型，将剩余油分布影响因素归结为4个地质因素（微相类型、所处部位、砂体有效厚度、渗透率）和6个开发因素（注采关系、注水距离、井网密度、累积注水孔隙体积倍数、累积产油孔隙体积倍数、累积注采比）。以胜坨油田二区沙二段7^4-8^1单元为例，在精细油藏数值模拟研究的基础上，通过对模拟网格水淹状况和影响因素的分布情况进行统计分析，得到统计意义上的单因素不同条件下剩余油存在的概率大小。在此基础上，定量研究各因素对剩余油分布的影响程度及其规律，为指导特高含水开发期同类油藏寻求和挖潜剩余油提供必要的依据。

Factors Affecting the Remaining Oil Distribution at Extra High Water-cut Stage

Based on the accumulation mechanism and type of remaining oil at the high water-cut stage,factors affecting the distribution of remaining oil are classified into 4 geological factors,such as type of microfacies,location,effective sand thickness and permeability,etc.and 6 dynamic production factors,such as injection-production relationship,distance of water injection,well spacing,accumulated water injection,accumulated oil production,accumulated injection-production ratio,etc.Es_2 7~4-8~1 in Shengtuo Oilfield is taken for example,based on the fine reservoir numerical simulation,the statistical analysis of remaining oil is made under different conditions of each single factor through statistics of water-out behavior on each grid and the distribution of various factors.Based on the study mentioned above,the effect and laws of various factors on the distribution of remaining oil are studied quantitatively,by which a guidance is for remaining recovery oil in the similar reservoirs at the high watercut stage.