气候变化领域集成服务门户(CCPortal): Spectral Induced Polarization Characterization of Non-Consolidated Clays for Varying Salinities

CCPortal

DOI	10.1029/2020JB021125
	Spectral Induced Polarization Characterization of Non-Consolidated Clays for Varying Salinities—An Experimental Study
	Mendieta A.; Jougnot D.; Leroy P.; Maineult A.
发表日期	2021
ISSN	21699313
卷号	126 期号:4
英文摘要	Clay material characterization is of importance for many geo-engineering and environmental applications, and geo-electrical methods are often used to detect them in the subsurface. Spectral induced polarization (SIP) is a geo-electric method that nonintrusively measures the frequency-dependent complex electrical conductivity of a material, in the mHz to the kHz range. We present a new SIP data set of four different types of clay (a red montmorillonite sample, a green montmorillonite sample, a kaolinite sample, and an illite sample) at five different salinities (initially de-ionized water, 10−3, 10−2, 10−1, and 1 mol/L of NaCl). We propose a new laboratory protocol that allows the repeatable characterization of clay samples. The complex conductivity spectra are interpreted with the widely used phenomenological double-Pelton model. We observe an increase of the real part of the conductivity with salinity for all types of clay, while the imaginary part presents a nonmonotonous behavior. The decrease of polarization over conduction with salinity is interpreted as evidence that conduction increases with salinity faster than polarization. We test the empirical petrophysical relationship between (Formula presented.) and (Formula presented.) and validate this approach based on our experimental data and two other datasets from the literature. With this data set we can better understand the frequency-dependent electrical response of different types of clay. This unique data set of complex conductivity spectra for different types of clay samples is a step forward toward better characterization of clay formations in situ. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	Clay materials; laboratory experiments; spectral induced polarization; variation with salinity
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/187197
作者单位	Sorbonne Université, CNRS, EPHE, UMR 7619 METIS, Paris, France; BRGM, French Geological Survey, Orléans, France
推荐引用方式 GB/T 7714	Mendieta A.,Jougnot D.,Leroy P.,等. Spectral Induced Polarization Characterization of Non-Consolidated Clays for Varying Salinities—An Experimental Study[J],2021,126(4).
APA	Mendieta A.,Jougnot D.,Leroy P.,&Maineult A..(2021).Spectral Induced Polarization Characterization of Non-Consolidated Clays for Varying Salinities—An Experimental Study.Journal of Geophysical Research: Solid Earth,126(4).
MLA	Mendieta A.,et al."Spectral Induced Polarization Characterization of Non-Consolidated Clays for Varying Salinities—An Experimental Study".Journal of Geophysical Research: Solid Earth 126.4(2021).