摘要
在相控约束条件下,利用熵权方法,考虑了砂层厚度、有效厚度、砂岩系数、有效厚度系数、分层系数、夹层频数、夹层分布密度、孔隙度、渗透率、渗透率变异系数、突进系数、级差、含油饱和度共13种反映储层非均质性的参数,定量计算储层非均质综合指数。该方法包括确定对象集合、指标因素集合、指标矩阵、归一化指标值、指标权重和计算综合指数等。熵权非均质综合指数算法可将数值有差异的属性参数对非均质指数的贡献进行弱化和强化,即去同存异;熵权非均质综合指数的大小能定量表征储层的非均质性。利用该方法在下寺湾油田柳洛峪区长8储层进行了应用,定量地刻画了储层的平面非均质性,取得了满意的效果。
Under sedimentary facies constraint conditions, using the entropy weight method, the authors considered the sand layer thickness, the effective thickness, sand layer coefficient, the effective thickness coefficient, layered coefficient, interlayer frequency, interlayer distribution density and porosity, permeability, the permeability coefficient of variation coefficient, dash, differential and oil saturation altogether 13 types of parameters reflecting the reservoir heterogeneity, and calculated the synthetic index of reservoir hetero- geneity. The algorithm had six contents including determination steps of object assemblage, index assemblage and index matrix, normahzation of index value, determination of index weight, calculation of synthetic index. The heterogeneous synthetic index algorithm with entropy weight could make the contribution of attributive parameters to heterogeneous index weakened or strengthened, namely eliminating commonness and reserving difference. The obtained value of heterogeneous index with entropy weight could quantitatively reflect the heterogeneity of reservoir. This method had been widely used to characterize quantitatively the plane heterogeneity of Chang 8 reservoir in Xiasiwan, Erdos Basin.
出处
《地质学刊》
CAS
2012年第4期373-378,共6页
Journal of Geology
关键词
熵权法
非均质综合指数
长8储层
鄂尔多斯盆地
陕西
Entropy weight method
Heterogeneous synthetic index
Chang 8 reservoir
Erdos Basin
Shaanxi
