储层宏观非均质性定量表征研究

Research on quantitative characterization of macroscopic heterogeneity of reservoir

针对当前储层宏观非均质性定量表征参数计算数值无界、表征角度各异、表征方法定量化程度不高等问题，提出了基于储层物性参数累积分布特征的宏观非均质定量表征新参数。通过对任意一组空间分布相对均匀的渗透率数据降序排列，计算出渗透率贡献百分数及其对应的序数百分数，并在直角坐标系中绘制出渗透率累积分布曲线。通过倒数坐标变换，将不同形态的渗透率累积分布曲线转换成斜率为0～1的直线，将直线斜率值定义为储层非均质程度系数。该值与储层非均质程度成反比。应用结果表明，非均质程度系数可应用于各种级次储层宏观非均质程度的定量评价。

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.