气候变化领域集成服务门户(CCPortal): A Framework for Pore-Scale Simulation of Effective Electrical Conductivity and Permittivity of Porous Media in the Frequency Range From 1 mHz to 1 GHz

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DOI	10.1029/2020JB020515
	A Framework for Pore-Scale Simulation of Effective Electrical Conductivity and Permittivity of Porous Media in the Frequency Range From 1 mHz to 1 GHz
	Niu Q.; Zhang C.; Prasad M.
发表日期	2020
ISSN	21699313
卷号	125 期号:10
英文摘要	Geoelectrical methods are broadly used in earth sciences for various purposes. To correctly interpret field geoelectrical data, it is essential to have a mechanistic understanding of the effective electrical conductivity and permittivity of geological materials over a broad frequency range. Recently, the pore-scale numerical simulation, which utilizes the digital microstructural images of the material, has become a powerful tool in studying the effective electrical properties of geological media. However, it is still difficult to incorporate surface-related electrochemical processes in a pore-scale simulation. In this study, we develop a general framework to consider these electrochemical processes in pore-scale simulations, which enable the calculation of broadband effective electrical conductivity and permittivity of porous geological media. A Berea sandstone sample is utilized to demonstrate the use of the proposed framework. Laboratory experiments of the effective electrical conductivity and permittivity of the sample in the frequency range from 10−3 to 109 Hz provided valuable measurement data for validating the simulation. The good agreement between our simulated spectra and the experimental data provides validation for the numerical simulation to reproduce the variations in the effective electrical conductivity and permittivity of porous geological materials induced by both the electrochemical polarizations and the interfacial polarization. This work thus provides a useful tool for studying the effective electrical properties of porous geological materials featuring complex microstructures. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	electrical conductivity; induced polarization; microstructure; permittivity; pore-scale simulation
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187568
作者单位	Department of Geosciences, Boise State University, Boise, ID, United States; Department of Geology, The University of Kansas, Lawrence, KS, United States; Department of Geophysics, Colorado School of Mines, Golden, CO, United States
推荐引用方式 GB/T 7714	Niu Q.,Zhang C.,Prasad M.. A Framework for Pore-Scale Simulation of Effective Electrical Conductivity and Permittivity of Porous Media in the Frequency Range From 1 mHz to 1 GHz[J],2020,125(10).
APA	Niu Q.,Zhang C.,&Prasad M..(2020).A Framework for Pore-Scale Simulation of Effective Electrical Conductivity and Permittivity of Porous Media in the Frequency Range From 1 mHz to 1 GHz.Journal of Geophysical Research: Solid Earth,125(10).
MLA	Niu Q.,et al."A Framework for Pore-Scale Simulation of Effective Electrical Conductivity and Permittivity of Porous Media in the Frequency Range From 1 mHz to 1 GHz".Journal of Geophysical Research: Solid Earth 125.10(2020).