变差函数在描述储集层平面非均质性中的应用

Application of Variation Function in Description of Plane Heterogeneity of Resevoir.

储集层非均质性研究是油藏描述的重要内容,其参数的空间分布不仅具有随机性,而且具有结构性。从地质统计学关于变差函数的基本理论出发,在综合分析的基础上,构造了一种定量表征储集层平面非均质性的数学模型,并利用某油田不同储集层类型单砂层的砂体厚度作为“区域化变量”进行了实例计算,计算结果所反映的各类储集层的平面非均质特征符合沉积的基本规律,说明这一表征模型用于储集层平面非均质性定量评价中是可行的。同时,通过与变异系数计算值进行对比,说明该方法优于传统的数理统计方法。

Study of reservoir heterogeneity is significant for reservoir characterization. The parameter space distribution is not only of randomness,but of structural feature. From the basic principle of the variogram in geostatistics,this paper presents a mathematical model for quantitatively characterizing horizontal heterogeneity in reservoir. The case estimated results of using individual sand thickness as regional variables from various types of reservoirs in a field showed that the horizontal heterogeneities in different types of reservoirs fit the basic patterns in sedimentation,and this characterized model can be applied in them. In addition,compared to variable coefficient estimates,this method is superior to the available traditional mathematical statistics approaches.