scholarly journals A Physically Based Analytical Model to Describe Effective Excess Charge for Streaming Potential Generation in Water Saturated Porous Media

2018 ◽  
Vol 123 (1) ◽  
pp. 52-65 ◽  
Author(s):  
L. Guarracino ◽  
D. Jougnot
Keyword(s):  
Porous Media ◽  
Analytical Model ◽  
Streaming Potential ◽  
Excess Charge ◽  
Saturated Porous Media ◽  
Potential Generation ◽  
Physically Based ◽  
Water Saturated

scholarly journals A physically based model for the electrical conductivity of water-saturated porous media

2019 ◽  
Vol 219 (2) ◽  
pp. 866-876 ◽  
Author(s):  
Luong Duy Thanh ◽  
Damien Jougnot ◽  
Phan Van Do ◽  
Nguyen Van Nghia A
Keyword(s):  
Electrical Conductivity ◽  
Porous Media ◽  
Published Data ◽  
Saturated Porous Media ◽  
Formation Factor ◽  
Physically Based Model ◽  
Microstructural Parameters ◽  
Physically Based ◽  
Pore Liquid ◽  
Water Saturated

SUMMARY Electrical conductivity is one of the most commonly used geophysical method for reservoir and environmental studies. Its main interest lies in its sensitivity to key properties of storage and transport in porous media. Its quantitative use therefore depends on the efficiency of the petrophysical relationship to link them. In this work, we develop a new physically based model for estimating electrical conductivity of saturated porous media. The model is derived assuming that the porous media is represented by a bundle of tortuous capillary tubes with a fractal pore-size distribution. The model is expressed in terms of the porosity, electrical conductivity of the pore liquid and the microstructural parameters of porous media. It takes into account the interface properties between minerals and pore water by introducing a surface conductivity. Expressions for the formation factor and hydraulic tortuosity are also obtained from the model derivation. The model is then successfully compared with published data and performs better than previous models. The proposed approach also permits to relate the electrical conductivity to other transport properties such as the hydraulic conductivity.

scholarly journals A Physically Based Model for the Streaming Potential Coupling Coefficient in Partially Saturated Porous Media

Water ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1588
Author(s):  
Luong Duy Duy Thanh ◽  
Damien Jougnot ◽  
Phan Van Do ◽  
Nguyen Xuan Ca ◽  
Nguyen Thi Hien
Keyword(s):  
Porous Media ◽  
Coupling Coefficient ◽  
Water Saturation ◽  
Streaming Potential ◽  
Saturated Porous Media ◽  
Physically Based Model ◽  
Partially Saturated ◽  
Proposed Model ◽  
Physically Based ◽  
Partially Saturated Porous Media

The electrokinetics methods have great potential to characterize hydrogeological processes in porous media, especially in complex partially saturated hydrosystems (e.g., the vadose zone). The dependence of the streaming coupling coefficient on water saturation remains highly debated in both theoretical and experimental works. In this work, we propose a physically based model for the streaming potential coupling coefficient in porous media during the flow of water and air under partially saturated conditions. The proposed model is linked to fluid electrical conductivity, water saturation, irreducible water saturation, and microstructural parameters of porous materials. In particular, the surface conductivity of porous media has been taken into account in the model. In addition, we also obtain an expression for the characteristic length scale at full saturation in this work. The proposed model is successfully validated using experimental data from literature. A relationship between the streaming potential coupling coefficient and the effective excess charge density is also obtained in this work and the result is the same as those proposed in literature using different approaches. The model proposes a simple and efficient way to model the streaming potential generation for partially saturated porous media and can be useful for hydrogeophysical studies in the critical zone.

Cotransport of thallium(I) with polystyrene plastic particles in water-saturated porous media

2021 ◽  
pp. 126910
Author(s):  
Jinni Yao ◽  
Hainan Wang ◽  
Chengxue Ma ◽  
Yu Cao ◽  
Wanpeng Chen ◽  
...  
Keyword(s):  
Porous Media ◽  
Saturated Porous Media ◽  
Water Saturated

Formation Behaviors of Methane Hydrate in Partially Water-Saturated Porous Media with Different Particle Sizes

2021 ◽  
Author(s):  
Yu Zhang ◽  
Lei Zhang ◽  
Chuan-Yu Zhu ◽  
Li-Xin Xu ◽  
Xiao-Sen Li ◽  
...  
Keyword(s):  
Porous Media ◽  
Methane Hydrate ◽  
Particle Sizes ◽  
Saturated Porous Media ◽  
Water Saturated

Advances and benefits of fractal models to predict streaming potentials in partially saturated porous media

2021 ◽  
Author(s):  
Damien Jougnot ◽  
Luong Duy Thanh ◽  
Mariangeles Soldi ◽  
Jan Vinogradov ◽  
Luis Guarracino
Keyword(s):  
Porous Media ◽  
Fractal Theory ◽  
Electrical Potential ◽  
Streaming Potential ◽  
Excess Charge ◽  
Distribution Law ◽  
Distribution Models ◽  
Streaming Potentials ◽  
Fractal Models ◽  
Partially Saturated Porous Media

<p>Understanding streaming potential generation in porous media is of high interest for hydrological and reservoir studies as it allows to relate water fluxes to measurable electrical potential distributions in subsurface geological settings. The evolution of streaming potential <span>stems</span> from electrokinetic coupling between water and electrical fluxes due to the presence of an electrical double layer at the interface between the mineral and the pore water. Two different approaches can be used to model and interpret the generation of the streaming potential in porous media: the classical coupling coefficient approach based on the Helmholtz-Smoluchowski equation, and the effective excess charge density. Recent studies based on both approaches use a mathematical up-scaling procedure that employs the so-called fractal theory. In these studies, the porous medium is represented by a bundle of tortuous capillaries characterized by a fractal capillary-size distribution law. The electrokinetic coupling between the fluid flow and electric current is obtained by averaging the processes that take place in a single capillary. In most cases, closed-form expressions for the electrokinetic parameters are obtained in terms of macroscopic hydraulic variables like permeability, saturation and porosity. In this presentation we propose a review of the existing fractal distribution models that predict the streaming potential in porous media and discuss their benefits compared against other published models.</p>

Effect of humic acid on the sedimentation and transport of nanoparticles silica in water-saturated porous media

2019 ◽  
Vol 20 (2) ◽  
pp. 911-920 ◽  
Author(s):  
Mo Zhang ◽  
Duo Li ◽  
Zhi Ye ◽  
Shiqi Wang ◽  
Nan Xu ◽  
...  
Keyword(s):  
Porous Media ◽  
Humic Acid ◽  
Saturated Porous Media ◽  
Water Saturated

Co-transport of U(VI), humic acid and colloidal gibbsite in water-saturated porous media

Chemosphere ◽  
2019 ◽  
Vol 231 ◽  
pp. 405-414 ◽  
Author(s):  
Junwei Yang ◽  
Mengtuan Ge ◽  
Qiang Jin ◽  
Zongyuan Chen ◽  
Zhijun Guo
Keyword(s):  
Porous Media ◽  
Humic Acid ◽  
Saturated Porous Media ◽  
Water Saturated
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