裂缝性油藏渗透率张量计算及影响因素研究

Permeability Tensor Calculation and Its Influential Factors in Fractured Reservoirs

裂缝性油藏裂缝分布规律复杂多变,油层渗透率具有强烈的各向异性特征。以油藏精细网格模型数值模拟结果为基础,根据流量等效原理,建立了不规则粗化网格边界条件下渗透率全张量的计算方法;研究了压力边界条件数量、粗化边界大小、砂体主要渗透性方向与压力梯度方向的不同夹角条件对渗透率张量计算结果的影响,研究表明砂体主要渗透性方向与压力梯度方向的不同夹角条件对计算结果影响最大。研究结果为裂缝性油藏渗流参数的确定提供了理论依据。

The fracture distribution was complex and variable in fractured reservoirs with strong characters of anisotropy of reservoirs,in order to describe anisotropic characteristics of permeability,according to the equivalent flow principle,the calculation method of permeability tensor with irregular coarsening grid boundary conditions was established,numerical simulation results of fine mesh model was used as basis.Affection factors were studied,which mainly contained the number of different pressure edge conditions,the size of the coarsening grid boundary,and different angles between sand-body extending direction and pressure gradient direction.The results indicate that different angles between sand-body extending direction and pressure gradient direction have the biggest influence on the calculation result.And the results provide a theoretical basis for the determining seepage parameters of fractured reservoirs.