储层动态流动单元及剩余油分布规律

从应用Kozeny-Carman公式推导FZI的过程出发,根据对大量岩心样品的统计分析,研究了FZI的基础定义和物理意义.结果表明:具有相近FZI值的岩心样品具有较大的孔隙度、渗透率变化范围,不一定属于同一类流动单元.FZI值不能准确地表征影响流体流动的岩石物理性质,单纯采用FZI值作为划分储层流动单元的标准是值得商榷的.分析流动单元的定义及研究目的,针对高含水期油田开发,提出动态流动单元的概念和定量划分方法.以胜坨油田沙二段3砂组为例进行的研究结果表明:不同开发阶段的剩余油分布与储层动态流动单元关系密切,通过建立不同含水期的流动单元动态模型,应用动态流动单元方法研究高含水期油田剩余油分布规律更具有实际意义.

Reservoir Dynamic Flow Unit and Remaining Oil Distribution

In accordance with the FZI deduction process from Kozeny-Carman formulation, the fundamental concept and physical significance of FZI were studied based on the statistical analysis of core data. The result indicates that the core samples with similar FZI value may have a wide range of porosity and permeability and are not necessarily belong to a same flow unit. It is questioned if the FZI value could be used as criteria to classify flow units, because it cannot accurately describe the core physical characteristics that influence fluid flow. With the definition of flow unit and its purpose analyzed, a new concept of dynamic flow unit and its quantitative classifying methods, especially for the high water cut oil field, were put forward. Take the reservoir of the third layers in the second member of the Shahejie Formation in the second district of the Shengtuo oilfield as a example, the present study shows that the distribution of remaining oil in different water cut stages have closely relationship with the reservoir dynamic flow unit and has built a dynamic flow unit model for different water cut stages. It would be more significant to study remaining oil distribution at high water cut stage oil field using the dynamic flow unit method.