Resistivity of partially saturated carbonate rocks with microporosity
Resistivity of partially saturated carbonate rocks with microporosity
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DOI：
10.1190/1.1444152
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发表时间：
1997-03
期刊：
影响因子：
3.3
通讯作者：
P. Sen
中科院分区：
文献类型：
--
作者：
P. Sen
简单的阿尔奇关系式将平均电导率与平均孔隙度和平均饱和度联系起来，并且在局部孔隙度和局部饱和度的波动较小时似乎起作用。一般来说，碳酸盐岩是极不均匀的，阿尔奇关系式不成立-饱和度指数n可以取决于饱和度本身，n可以非常大或非常小。利用有效介质理论计算了具有微孔、大孔和溶洞的岩石的电阻率。定量的数学建模被用来研究纹理细节的影响。将导致饱和度指数过高值的几何形状与具有饱和度指数过低值的几何形状进行对比。当导电的水相被困在孤立的区域时，电阻率变得非常大。如果主要载流路径的配置随饱和度变化很小，则电阻率对水的体积分数不敏感。简单的例子与不同的…
Simple Archie's relations relate average conductivity to average porosity and average saturation, and seem to work when the fluctuations of local porosity and local saturation are small. In general, carbonates are extremely inhomogeneous and Archie's relations fail—the saturation exponent n can depend on saturation itself, and n can be anomalously large or small. The resistivity of rocks with a mixture of micropores, macropores, and vugs is computed using effective medium theories. Quantitative mathematical modeling is used to study the influence of textural details. Geometries that lead to an anomalously high value of saturation exponent are contrasted with those with an anomalously low value of saturation exponent. The resistivity becomes anomalously large when the conducting water phase is trapped in isolated regions. The resistivity becomes insensitive to the volume fraction of water if the configuration of the major current‐carrying paths changes little with saturation. Simple examples with differenc...