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Search for fluid seepage structures at sea floor offshore off NE Sakhalin Island, the Sea of Okhotsk

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Title
Search for fluid seepage structures at sea floor offshore off NE Sakhalin Island, the Sea of Okhotsk
Other Titles
오호츠크해 북동사할린 해역의 해저면 지층수분출구조 연구
Authors
Jin, Young Keun
B. Baranov
H. Shoji
Chung, Kyung Ho
L. Mazurenko
A. Obzhirov
Keywords
Okhotsk Sea; accumulations; gas hydrate; seepage structure
Issue Date
2007
Citation
Jin, Young Keun, et al. 2007. Search for fluid seepage structures at sea floor offshore off NE Sakhalin Island, the Sea of Okhotsk. JPGU. JPGU. 2007.05.20~.
Abstract
The International Research Project CHAOS (Russia-Korea-Japan) aimed at the study of gas hydrate formation processes associated with the fluid venting in the Sea of Okhotsk. During the cruises, large hydrate-bearing seepage structures were newly found on the continental slope of the Sakhalin Island at water depths of 400-1,000 m by multi-frequency and high-resolution geophysical surveys including Side-scan Sonar (SSS), 3.5 kHz sub-bottom profiling, sparker seismic profiling, and echo-sounding. In an area of 200 km2, SSS survey identified more than 40 seepage structures. Using short gravity core (<5 m), gas hydrate samples including massive pure gas hydrate layers (up to 35 cm thick) were successfully recovered within these seepage structures at very shallow subbottom depths. Gas hydrate sample taken at the water depth less then 400 m during the cruise is believed as the shallowest submarine gas hydrate discovered ever in the world. The total gas accumulations within all seepage structures (4.36 km2) in the area may be as much as 3.5×109 km3.
URI
http://repository.kopri.re.kr/handle/201206/7747
Conference Name
JPGU
Conference Place
JPGU
Conference Date
2007.05.20~
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