3种计算渗透率变异系数方法的对比

Comparison and Analysis of Three Calculation Methods of Reservoir Permeability Variation Coefficient

渗透率变异系数是描述油藏宏观非均质性的一个重要参数,目前有计算渗透率变异系数的方法有统计学理论公式法、Dykstra-Parsons定义法和lorenz系数法3种,通过详细介绍并对比不同方法的计算步骤与原理,给出了每种方法的优缺点和适用范围,并以东部层状砂岩油田7个处于特高含水开发阶段的区块为例进行验证和比较。结果表明,统计学理论公式法与Dykstra-Parsons定义法得到的结果与实际地质认识稍有不同,lorenz系数法与地质认识相一致。通过理论与实际对比分析推荐采用lorenz系数法来计算渗透率变异系数。

Reservoir permeability variation coefficient is one of the important parameters for describing reservoir heterogeneity.The three methods of calculating it are studied in detail,which include the formula of statistics and the definition of DykstraParsons and the coefficient of Lorenz.The advantages and shortcomings and applied scope of every method are discussed by comparison of their calculating steps and principle.The results indicate that the values of using the formula of statistics and the definition of Dykstra-Parsons differ a little from practical geological understanding,but they are consistent with the value of Lorenz coefficient.The method of Lorenz coefficient is recommended as the calculation method of permeability variation coefficient through the comparison and analysis of theory and practice.