Structural-stratigraphic control on the Umitaka Spur gas hydrates of Joetsu Basin in the eastern margin of Japan Sea |
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| Affiliation: | 1. Petrobras Research Center (CENPES), Av. Horácio Macedo, 950, Cidade Universitária, Ilha do Fundão, Rio de Janeiro-RJ, 21941-915, Brazil;2. Department of Earth and Planetary Sciences, Graduate School of Science, The University of Tokyo, 7-3-1, Hongo Campus, Bunkyo-ku, Tokyo, 113-0033, Japan;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. School of Marine Sciences, Sun Yat-sen University, Zhuhai, Guangdong, 519082, China;2. Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou, Guangdong, 510006, China;3. 3D Seismic Lab, School of Earth and Ocean Sciences, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, United Kingdom;4. CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 510301, Guangzhou, China;5. Guangzhou Marine Geological Survey, Guangzhou, Guangdong, 510075, China;6. R&D Center for Ocean Drilling Science, Yokohama Institute, JAMSTEC, Yokohama, 2360001, Japan;7. Key Laboratory of Gas Hydrate, Ministry of Land and Resources, Qingdao, Shandong, 266071, China;8. Science Education Department, National Museum of Natural Science, Taichung, Taiwan;1. Graduate School of Science and Technology, Niigata University, 8050, Ikarashi 2-no-cho, Nishi-ku, Niigata, 950-2181, Japan;2. Graduate School of Environmental Studies, Tohoku University, Aramaki Aza Aoba 6-6-11, Aoba-ku, Sendai, 980-8579, Japan;3. Graduate School of Engineering, Tohoku University, Aramaki Aza Aoba 6-6-11, Aoba-ku, Sendai, 980-8579, Japan;4. Research Center of Supercritical Fluid Technology, Tohoku University, Aramaki Aza Aoba 6-6-11, Aoba-ku, Sendai, 980-8579, Japan;1. Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, China;2. Guangzhou Institute of Energy Conversion, Guangzhou 510640, Guangdong, China;1. PETROBRAS – CENPES Centro de Pesquisas e Desenvolvimento Leopoldo Américo Miguez de Mello, 21941-915, Rio de Janeiro, RJ, Brazil;2. IPR – Instituto do Petróleo e dos Recursos Naturais, PUCRS – Pontifícia Universidade Católica do Rio Grande do Sul, 90619-900, Porto Alegre, Brazil;3. PETROBRAS – E&P EXPLORATION, 20031-170, Rio de Janeiro, RJ, Brazil;1. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2. U. S. Geological Survey, Denver Federal Center, Box 25046, MS-939, Denver, CO 80225, USA;3. Guangzhou Marine Geological Survey, MLR, Guangzhou 510075, China |
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| Abstract: | Integrated geological, geochemical, and geophysical exploration since 2004 has identified massive accumulation of gas hydrate associated with active methane seeps on the Umitaka Spur, located in the Joetsu Basin on the eastern margin of Japan Sea. Umitaka Spur is an asymmetric anticline formed along an incipient subduction zone that extends throughout the western side of the Japanese island-arc system. Seismic surveys recognized chimney structures that seem strongly controlled by a complex anticlinal axial fault system, and exhibit high seismic amplitudes with apparent pull-up structures, probably due to massive and dense accumulation of gas hydrate. Bottom simulating reflectors are widely developed, in particular within gas chimneys and in the gently dipping eastern flank of the anticline, where debris can store gas hydrates that may represent a potential natural gas resource. The axial fault system, the shape of the anticline, and the carrier beds induce thermogenic gas migration to the top of the structure, and supply gas to the gas hydrate stability zone. Gas reaching the seafloor produces strong seepages and giant plumes in the sea water column. |
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