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Geophysical investigation of gas hydrate-bearing sediments in the Sea of Okhotsk

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Geophysical investigation of gas hydrate-bearing sediments in the Sea of Okhotsk
Other Titles
오호츠크해 가스하이드레이트 퇴적층의 지구물리 연구
Jin, Young Keun
Kim, Yeadong
Chung, Kyung Ho
Hong, Jong Kuk
Okhotsk Sea; gas hydrates; geophysics
Issue Date
Jin, Young Keun, et al. 2005. Geophysical investigation of gas hydrate-bearing sediments in the Sea of Okhotsk. 한국해양학회. 한국해양학회. 2005.11.03~.
As the sea connecting with the East Sea, the Sea of Okhotsk is the most potential area of gas hydrates in the world. In other to examine geophysical structures of gas hydrate-bearing sediments in the Sea of Okhotsk, the CHAOS (hydro-Carbon Hydrate Accumulation in the Okhotsk) international research expedition was carried out in August 2003. In the expedition, high-resolution seismic and geochemical survey was also conducted. Sparker seismic profiles show only diffusive high-amplitude reflections without BSRs at BSR depth. It means that BSR appears to be completely different images on seismic profiles obtained using different frequencies. Many gas chimneys rise up from BSR depth to seafloor. The chimneys can be divided into two groups with different seismic characteristics
wipe-out (WO) and enhanced reflection (ER) chimneys. Different seismic responses in the chimneys would be caused by amount of gas and gas hydrates filling in the chimneys. In hydroacoustic data, a lot of gas flares rise up several hundreds meters from seafloor to the water column. All flares took placed at the depths within gas hydrate stability zone. It is interpreted that gas hydrate-bearing sediments with low porosity and permeability due to gas hydrate filling in the pore space make good pipe around gas chimneys in which gas is migrating up without loss of amount. Therefore, large-scale gas flare at the site on gas chimney releases into the water column.
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