储层非均质性描述的地质统计学方法

储层非均质性对油气的聚集、产出、分布和油气藏的形成等起着至关重要的作用。因此,储层非均质性描述在石油勘探和开发中具有重要的意义。储层非均质性既具有结构性,又具有随机性,是区域化变量。根据地质统计学的理论,通过半变异函数,在前人工作的基础上,利用k阶球状模型拟合实验半变异曲线,利用线性规划法实现了阶球状模型的最优拟合。提出了评价储层非均质性的综合评价指标,对储层非均质性的变化幅度、变化速度以及变化的随机性进行定量描述。具体实例表明,该方法具有一定的优越性和实用性。

GEOLOGICAL STATISTICS OF RESERVOIR HETERO-GENEITY DESCRIPTION

The heterogeneity of reservoir is one of the most important factors to control the accumulation, production and distribution of oil and gas. Therefore, it is important for the heterogeneity of reservoir to be studied. Heterogeneity of reservoir is treated as regional variation, and it is not only in structural nature, but also in stochastic nature. Based on the work of Jiao Xiguo et.al,the theory of geological statistics, linear programming and through variation function, the experimental variation function curve is matched byk-th spherical model. The aggregate index that appears the variation magnitude and variation speedand the variation nature is proposed to describe quantitatively the variation nature and complexity of heterogeneity. With practical examples, the advantage and practical application of this method can be seen.