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Distribution and expression of gas seeps in a gas hydrate province of the northeastern Sakhalin continental slope, Sea of Okhotsk

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Title
Distribution and expression of gas seeps in a gas hydrate province of the northeastern Sakhalin continental slope, Sea of Okhotsk
Authors
Jin, Young Keun
Anatoly Obzhirov
Kim, Young-Gyun
Boris Baranov
Hitoshi Shoji
Subject
Geology
Keywords
Active seepage; Gas hydrate; Gas seep; Okhotsk Sea; Sakhalin continental slope
Issue Date
2011
Publisher
Elsevier
Citation
Jin, Young Keun, et al. 2011. "Distribution and expression of gas seeps in a gas hydrate province of the northeastern Sakhalin continental slope, Sea of Okhotsk". Marine and Petroleum Geology, 28(10): 1844-1855.
Abstract
Multidisciplinary surveys were conducted to investigate gas seepage and gas hydrate accumulation on the northeastern Sakhalin continental slope (NESS), Sea of Okhotsk, during joint Korean?Russian?Japanese expeditions conducted from 2003 to 2007 (CHAOS and SSGH projects). One hundred sixty-one gas seeps were detected in a 2,000 km2 area of the NESS (between 53º45N and 54º45N). Active gas seeps in the gas hydrate system on the NESS were evident from features in the water column, on the seafloor, and in the subsurface: well-defined hydroacoustic anomalies (gas flares), side-scan sonar structures with high backscatter intensity (seepage structures), bathymetric structures (pockmarks and mounds), gas- and gas-hydrate-related seismic features (bottom-simulating reflectors, gas chimneys, high-amplitude reflectors, and acoustic blanking), high methane concentrations in seawater, and gas hydrates in sediment near the seafloor. These expressions were generally spatially related;a gas flare would be associated with a seepage structure (mound), below which a gas chimney was present. The spatial distribution of gas seeps on the NESS is controlled by four types of geological structures: faults, the shelf break, seafloor canyons, and submarine slides. Gas chimneys that produced enhanced reflection on high-resolution seismic profiles are interpreted as active pathways for upward gased from 2003 to 2007 (CHAOS and SSGH projects). One hundred sixty-one gas seeps were detected in a 2,000 km2 area of the NESS (between 53º45N and 54º45N). Active gas seeps in the gas hydrate system on the NESS were evident from features in the water column, on the seafloor, and in the subsurface: well-defined hydroacoustic anomalies (gas flares), side-scan sonar structures with high backscatter intensity (seepage structures), bathymetric structures (pockmarks and mounds), gas- and gas-hydrate-related seismic features (bottom-simulating reflec
URI
http://repository.kopri.re.kr/handle/201206/6320
DOI
http://dx.doi.org/10.1016/j-marpetgeo.2011.03.007
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