Physics – Geophysics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3809313d&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 9, CiteID L09313
Physics
Geophysics
Marine Geology And Geophysics: Gas And Hydrate Systems, Marine Geology And Geophysics: Marine Electromagnetics, Mineral Physics: Electrical Properties, Paleoceanography: Greenhouse Gases, Physical Properties Of Rocks: Magnetic And Electrical Properties (0925)
Scientific paper
Electromagnetic (EM) remote-sensing techniques are demonstrated to be sensitive to gas hydrate concentration and distribution and complement other resource assessment techniques, particularly seismic methods. To fully utilize EM results requires knowledge of the electrical properties of individual phases and mixing relations, yet little is known about the electrical properties of gas hydrates. We developed a pressure cell to synthesize gas hydrate while simultaneously measuring in situ frequency-dependent electrical conductivity (σ). Synthesis of methane (CH4) hydrate was verified by thermal monitoring and by post run cryogenic scanning electron microscope imaging. Impedance spectra (20 Hz to 2 MHz) were collected before and after synthesis of polycrystalline CH4 hydrate from polycrystalline ice and used to calculate σ. We determined the σ of CH4 hydrate to be 5 × 10-5 S/m at 0°C with activation energy (Ea) of 30.6 kJ/mol (-15 to 15°C). After dissociation back into ice, σ measurements of samples increased by a factor of ˜4 and Ea increased by ˜50%, similar to the starting ice samples.
Constable Steven
Du Frane Wyatt L.
Pinkston John C.
Roberts Jeffery J.
Stern Laura A.
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