Electrical properties of methane hydrate + sediment mixtures: The σ of CH4 Hydrate + Sediment
Abstract
Abstract Knowledge of the electrical properties of multicomponent systems with gas hydrate, sediments, and pore water is needed to help relate electromagnetic (EM) measurements to specific gas hydrate concentration and distribution patterns in nature. Toward this goal, we built a pressure cell capable of measuring in situ electrical properties of multicomponent systems such that the effects of individual components and mixing relations can be assessed. We first established the temperature‐dependent electrical conductivity ( σ ) of pure, single‐phase methane hydrate to be ~5 orders of magnitude lower than seawater, a substantial contrast that can help differentiate hydrate deposits from significantly more conductive water‐saturated sediments in EM field surveys. Here we report σ measurements of two‐component systems in which methane hydrate is mixed with variable amounts of quartz sand or glass beads. Sand by itself has low σ but is found to increase the overall σ of mixtures with well‐connected methane hydrate. Alternatively, the overall σ decreases when sand concentrations are high enough to cause gas hydrate to be poorly connected, indicating that hydrate grains provide the primary conduction path. Our measurements suggest that impurities from sand induce chemical interactions and/or doping effects that result in higher electrical conductivity with lowermore »
- Authors:
-
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- U. S. Geological Survey, Menlo Park, CA (United States)
- Scripps Institution of Oceanography, La Jolla, CA (United States)
- Scripps Institution of Oceanography, La Jolla, CA (United States); National Oceanography Centre Southampton (United Kingdom), Univ. of Southampton Waterfront Campus, Southampton (United Kingdom)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1249142
- Alternate Identifier(s):
- OSTI ID: 1402220
- Report Number(s):
- LLNL-JRNL-653840
Journal ID: ISSN 2169-9313
- Grant/Contract Number:
- AC52-07NA27344; DE‐NT0005668
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research. Solid Earth
- Additional Journal Information:
- Journal Volume: 120; Journal Issue: 7; Journal ID: ISSN 2169-9313
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 03 NATURAL GAS; 58 GEOSCIENCES; 16 TIDAL AND WAVE POWER; 54 ENVIRONMENTAL SCIENCES; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Du Frane, Wyatt L., Stern, Laura A., Constable, Steven, Weitemeyer, Karen A., Smith, Megan M., and Roberts, Jeffery J. Electrical properties of methane hydrate + sediment mixtures: The σ of CH4 Hydrate + Sediment. United States: N. p., 2015.
Web. doi:10.1002/2015JB011940.
Du Frane, Wyatt L., Stern, Laura A., Constable, Steven, Weitemeyer, Karen A., Smith, Megan M., & Roberts, Jeffery J. Electrical properties of methane hydrate + sediment mixtures: The σ of CH4 Hydrate + Sediment. United States. https://doi.org/10.1002/2015JB011940
Du Frane, Wyatt L., Stern, Laura A., Constable, Steven, Weitemeyer, Karen A., Smith, Megan M., and Roberts, Jeffery J. Thu .
"Electrical properties of methane hydrate + sediment mixtures: The σ of CH4 Hydrate + Sediment". United States. https://doi.org/10.1002/2015JB011940. https://www.osti.gov/servlets/purl/1249142.
@article{osti_1249142,
title = {Electrical properties of methane hydrate + sediment mixtures: The σ of CH4 Hydrate + Sediment},
author = {Du Frane, Wyatt L. and Stern, Laura A. and Constable, Steven and Weitemeyer, Karen A. and Smith, Megan M. and Roberts, Jeffery J.},
abstractNote = {Abstract Knowledge of the electrical properties of multicomponent systems with gas hydrate, sediments, and pore water is needed to help relate electromagnetic (EM) measurements to specific gas hydrate concentration and distribution patterns in nature. Toward this goal, we built a pressure cell capable of measuring in situ electrical properties of multicomponent systems such that the effects of individual components and mixing relations can be assessed. We first established the temperature‐dependent electrical conductivity ( σ ) of pure, single‐phase methane hydrate to be ~5 orders of magnitude lower than seawater, a substantial contrast that can help differentiate hydrate deposits from significantly more conductive water‐saturated sediments in EM field surveys. Here we report σ measurements of two‐component systems in which methane hydrate is mixed with variable amounts of quartz sand or glass beads. Sand by itself has low σ but is found to increase the overall σ of mixtures with well‐connected methane hydrate. Alternatively, the overall σ decreases when sand concentrations are high enough to cause gas hydrate to be poorly connected, indicating that hydrate grains provide the primary conduction path. Our measurements suggest that impurities from sand induce chemical interactions and/or doping effects that result in higher electrical conductivity with lower temperature dependence. These results can be used in the modeling of massive or two‐phase gas‐hydrate‐bearing systems devoid of conductive pore water. Further experiments that include a free water phase are the necessary next steps toward developing complex models relevant to most natural systems.},
doi = {10.1002/2015JB011940},
journal = {Journal of Geophysical Research. Solid Earth},
number = 7,
volume = 120,
place = {United States},
year = {Thu Jul 30 00:00:00 EDT 2015},
month = {Thu Jul 30 00:00:00 EDT 2015}
}
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