Electroosmotic flow and the validity of the classical Darcy equation in silty shales
Electroosmotic flow and the validity of the classical Darcy equation in silty shales
复制标题
DOI：
10.1029/2001gl013480
复制
发表时间：
2002-05
影响因子：
5.2
通讯作者：
A. Revil;M. Pessel
中科院分区：
文献类型：
--
作者：
A. Revil;M. Pessel
电渗流是指在电场或电流密度作用下，孔隙水在多孔介质中的流动。建立了一个描述粉质页岩电液耦合流动问题的模型。电渗流的强度在这里被模拟为孔隙度、颗粒形状、pH和孔隙水的离子强度的函数。在孔隙流体压力梯度下强迫流动的情况下，电渗透降低了过滤速度。这种效应可以通过在达西方程的经典形式中引入有效渗透率或表观渗透率来模拟。这种表观渗透率可能比固有渗透率小得多，并且对孔隙水的矿化度非常敏感。
Electroosmotic flow represents the flow of pore water through a porous medium submitted to an electrical field or an electrical current density. A model is developed to describe the coupled electric/hydraulic flow problem in silty shales. The strength of electroosmotic flow is modeled here as a function of porosity, grain shape, pH, and ionic strength of the pore water. In the case of forced flow under a pore fluid pressure gradient, electroosmosis reduces the filtration velocity. This effect can be modeled by introducing an effective or apparent permeability into the classical form of the Darcy equation. This apparent permeability can be much smaller than the intrinsic permeability and becomes very sensitive to the salinity of the pore water.