동해 심해 울릉분지의 침니 구조
Chimney Structures in the Deep-water Ulleung Basin, East Sea
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초록
For detecting and mapping the seismic indicators for gas hydrate presence in the Ulleung Basin such as chimneystructures, where the temperature/pressure conditions for gas-hydrate presence are sufficient, a total 11332.732 L.km 2D multi-channeldigital seismic data and 12574.4445 L.km of single-channel data were acquired by KIGAM using air-gun system and R/V TAMHAE IIin 1997~2004. Acquired multi-channel seismic data were processed to define gas hydrate indicators such as BSRs and chimneystructures using ProMax. The acoustic faices of shallow sediments were also analyzed to understand the relationship betweensedimentary strata and gas hydrate indicators. A number of vertical/sub-vertical chimney structures were identified in the basin. Theymay formed by gas and/or fluid upwelling through fractures and faults. Many of them are characterized by velocity pull-up structuresand acoustic blank zones that are interpreted to be a result of higher velocity of gas hydrate. The presence of gas-hydrates in thechimney structures were confirmed by the piston coring in 2007, and the deep-drilling in 2007/2010. Most of them occur inturbidite/hemi-pelagic sediments in the northern basin. To develop the gas-hydrate within the chimney structures, studies have beenperformed as a part of national gas-hydrate project.
Abstract
For detecting and mapping the seismic indicators for gas hydrate presence in the Ulleung Basin such as chimneystructures, where the temperature/pressure conditions for gas-hydrate presence are sufficient, a total 11332.732 L.km 2D multi-channeldigital seismic data and 12574.4445 L.km of single-channel data were acquired by KIGAM using air-gun system and R/V TAMHAE IIin 1997~2004. Acquired multi-channel seismic data were processed to define gas hydrate indicators such as BSRs and chimneystructures using ProMax. The acoustic faices of shallow sediments were also analyzed to understand the relationship betweensedimentary strata and gas hydrate indicators. A number of vertical/sub-vertical chimney structures were identified in the basin. Theymay formed by gas and/or fluid upwelling through fractures and faults. Many of them are characterized by velocity pull-up structuresand acoustic blank zones that are interpreted to be a result of higher velocity of gas hydrate. The presence of gas-hydrates in thechimney structures were confirmed by the piston coring in 2007, and the deep-drilling in 2007/2010. Most of them occur inturbidite/hemi-pelagic sediments in the northern basin. To develop the gas-hydrate within the chimney structures, studies have beenperformed as a part of national gas-hydrate project.
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