Passing gas through the hydrate stability zone at southern Hydrate Ridge,offshore Oregon |
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| Institution: | 1. Methane Hydrate Research & Development Group, Japan Oil, Gas and Metals National Corporation (JOGMEC), 1-2-2, Hamada, Mihama-Ku, Chiba-City, Chiba 261-0025, Japan;2. Geotek Ltd., 4 Sopwith Way, Daventry NN11 8PB, UK;3. Methane Hydrate Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Sapporo 062-8517, Japan;1. Petroleum and Marine Resources Research Division, Korea Institute of Geoscience and Mineral Resources, 124 Gwahang-no, Yuseong-gu, Daejeon 305-350, South Korea;2. Energy Resources Program, Denver Federal Center, U.S. Geological Survey, Box 25046, MS 939, Denver, CO 80225, USA;3. Geological Survey of Canada – Pacific, Natural Resources Canada, 9860 W. Saanich Rd. Sidney, BC V8L 4B2, Canada;1. Geomar Helmholtz Centre for Ocean Research Kiel, Wischhofstraße 1–3, 24148 Kiel, Germany;2. Institute of Earth Sciences, Academia Sinica, No. 128, Academia Road, Sec. 2, Nangang Dist., Taipei, Taiwan;3. Institute of Marine Sciences and Technology, Dokuz Eylül University, Bakü Street, 35340 Inciralti, Izmir, Turkey;1. CAGE-Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geology, UiT – The Arctic University of Norway, PO Box 6050 Langnes, N-9037, Tromsø, Norway;2. Huffington Department of Earth Sciences, Southern Methodist University, PO Box 750395, Dallas, TX, 75275, USA;1. School of Earth Sciences, The Ohio State University, 125 South Oval Mall, Columbus, OH 43210, USA;2. Dokuz Eylül University, Institute of Marine Sciences and Technology, Haydar Aliyev Blv., 35340 Inciralti, Izmir, Turkey;3. Lamont-Doherty Earth Observatory, 61 Route 9W, Palisades, NY 10964, USA |
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| Abstract: | We present an equilibrium model of methane venting through the hydrate stability zone at southern Hydrate Ridge, offshore Oregon. Free gas supplied from below forms hydrate, depletes water, and elevates salinity until pore water is too saline for further hydrate formation. This system self-generates local three-phase equilibrium and allows free gas migration to the seafloor. Log and core data from Ocean Drilling Program (ODP) Site 1249 show that from the seafloor to 50 m below seafloor (mbsf), pore water salinity is elevated to the point where liquid water, hydrate and free gas coexist. The elevated pore water salinity provides a mechanism for vertical migration of free gas through the regional hydrate stability zone (RHSZ). This process may drive gas venting through hydrate stability zones around the world. Significant amount of gaseous methane can bypass the RHSZ by shifting local thermodynamic conditions. |
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