ABSTRACT Geophysical length scales defined from induced‐polarization measurements can be used in models of permeability (k) prediction. We explore the relative merit of different induced‐polarization parameters as proxies of an effective hydraulic radius (reff) that can be used to predict permeability from a modified Hagen–Poiseuille equation. Whereas geometrical measures of the hydraulic radius are good proxies of reff, the induced‐polarization measures are not well correlated with reff. However, a new proxy of reff that considers both imaginary conductivity and formation factor shows an improved correlation with reff. The resulting model enables a better quality of permeability prediction compared with the other geophysical length scales, but does not reach the predictive quality of the models based on geometrical length scales. The specific polarizability defined when incorporating the effect of the formation factor on imaginary conductivity appears to be independent of pore geometry, indicating that it is the correct parameter representing the role of the surface electrochemistry on the induced‐polarization effect. However, the joint dependence of induced‐polarization measurements on both the pore radius and the tortuosity and porosity of the interconnected pore network is a limitation to the widely explored use of induced‐polarization measurements to isolate surface properties from volumetric properties of the interconnected pore network.

中文翻译：

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从激发极化估计渗透率：使用有效水力半径概念评估地球物理长度尺度

摘要 由诱导极化测量定义的地球物理长度尺度可用于渗透率 (k) 预测模型。我们探索了不同诱导极化参数作为有效水力半径 (reff) 的代理的相对优点，可用于从修改后的 Hagen-Poiseuille 方程预测渗透率。虽然水力半径的几何测量是 reff 的良好代表，但诱导极化测量与 reff 没有很好的相关性。然而，考虑了虚电导率和地层因子的 reff 的新代理显示了与 reff 的改进相关性。与其他地球物理长度尺度相比，生成的模型能够实现更好的渗透率预测质量，但没有达到基于几何长度尺度的模型的预测质量。结合地层因素对假想电导率的影响定义的特定极化率似乎与孔隙几何形状无关，表明它是代表表面电化学对诱导极化效应作用的正确参数。然而，诱导极化测量对孔隙半径和互连孔隙网络的弯曲度和孔隙率的联合依赖性限制了广泛探索使用诱导极化测量将表面特性与互连孔隙网络的体积特性分离. 表明它是代表表面电化学对诱导极化效应作用的正确参数。然而，诱导极化测量对孔隙半径和互连孔隙网络的弯曲度和孔隙率的联合依赖性限制了广泛探索使用诱导极化测量将表面特性与互连孔隙网络的体积特性分离. 表明它是代表表面电化学对诱导极化效应作用的正确参数。然而，诱导极化测量对孔隙半径和互连孔隙网络的弯曲度和孔隙率的联合依赖性限制了广泛探索使用诱导极化测量将表面特性与互连孔隙网络的体积特性分离.