气候变化领域集成服务门户(CCPortal): Laboratory Electrical Conductivity of Marine Gas Hydrate

CCPortal

DOI	10.1029/2020GL087645
	Laboratory Electrical Conductivity of Marine Gas Hydrate
	Constable S.; Lu R.; Stern L.A.; Du Frane W.L.; Roberts J.J.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:16
英文摘要	Methane hydrate was synthesized from pure water ice and flash frozen seawater, with varying amounts of sand or silt added. Electrical conductivity was determined by impedance spectroscopy, using equivalent circuit modeling to separate the effects of electrodes and to gain insight into conduction mechanisms. Silt and sand increase the conductivity of pure hydrate; we infer by contaminant NaCl contributing to conduction in hydrate, to values in agreement with resistivities observed in well logs through hydrate-saturated sediment. The addition of silt and sand lowers the conductivity of hydrate synthesized from seawater by an amount consistent with Archie's law. All samples were characterized using cryogenic scanning electron microscopy and energy dispersive spectroscopy, which show good connectivity of salt and brine phases. Electrical conductivity measurements of pure hydrate and hydrate mixed with silt during pressure-induced dissociation support previous conclusions that sediment increases dissociation rate. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Dissociation; Electric conductivity; Electric variables measurement; Energy dispersive spectroscopy; Equivalent circuits; Hydration; Scanning electron microscopy; Seawater; Silt; Sodium chloride; Well logging; Conduction Mechanism; Cryogenic scanning electron microscopy; Electrical conductivity; Electrical conductivity measurements; Equivalent circuit model; Impedance spectroscopy; Induced dissociation; Saturated sediments; Gas hydrates; brine; electrical conductivity; gas hydrate; ice cap; laboratory method; methane; saturated medium; seawater; silt
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169890
作者单位	Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, United States; Lawrence Livermore National Laboratory, Livermore, CA, United States; U.S. Geological Survey, Menlo Park, CA, United States
推荐引用方式 GB/T 7714	Constable S.,Lu R.,Stern L.A.,et al. Laboratory Electrical Conductivity of Marine Gas Hydrate[J],2020,47(16).
APA	Constable S.,Lu R.,Stern L.A.,Du Frane W.L.,&Roberts J.J..(2020).Laboratory Electrical Conductivity of Marine Gas Hydrate.Geophysical Research Letters,47(16).
MLA	Constable S.,et al."Laboratory Electrical Conductivity of Marine Gas Hydrate".Geophysical Research Letters 47.16(2020).