关键词: 宏观非均质性, 定量评价, 渗透率, 累积分布曲线, 非均质程度系数, 非均质级次

Abstract: There are some defects in the existing evaluation systems of macroscopic heterogeneity such as its unbounded parameters, fussy characterization and low degree of quantification. Based on the cumulative distribution of reservoir property, a new parameter named as coefficient of heterogeneity degree was proposed to quantitatively characterize the macroscopic heterogeneity degree. The homogeneous spatial distribution of a group of permeability data was arranged in descending order. The percentage of permeability contribution and the corresponding ordinal number were obtained and used to draw the cumulative distribution curve of permeability in Cartesian coordinate system. By means of coordinate conversion and regression, the different forms of cumulative distribution curves were converted into straight lines with bounded slope value from 0 to 1. The slope value was defined as coefficient of heterogeneity degree. The slope value is inverse proportion to the heterogeneity degree of reservoir. The coefficient of heterogeneity degree is favorable for the quantitative evaluation of macroscopic heterogeneity degree in different heterogeneity hierarchy.

Key words: macroscopic heterogeneity, quantitative evaluation, permeability, cumulative distribution curve, coefficient of heterogeneity degree, heterogeneity hierarchy