반사법 탄성파 탐사자료 해석에 의한 울릉분지 가스하이드레이트 부존 형태 연구 Investigation of Occurrence Patterns of Gas Hydrate using the Seismic Reflection Data from the Ulleung Basin, East Sea원문보기
For the investigation of seismic characteristics of gas hydrate, three seismic reflection data sets (6,690 L-km of 2D set, 400 km2 and 300 km2 of 3D sets) were provided from the Ulleung Basin, East Sea in 2005, 2006 and 2008. Seismic characteristics of the gas hydrate are tested and analyzed in term...
For the investigation of seismic characteristics of gas hydrate, three seismic reflection data sets (6,690 L-km of 2D set, 400 km2 and 300 km2 of 3D sets) were provided from the Ulleung Basin, East Sea in 2005, 2006 and 2008. Seismic characteristics of the gas hydrate are tested and analyzed in terms of chimney, bottom simulating reflector (BSR), acoustic blanking in turbidite including pore-filling hydrate in sand, strong reflector at/near to seafloor within vent site, and enhanced reflection. The various gas hydrate morphologies such as nodules, veins, layers in mud and pore-filling type in sandy layer were identified from the Ulleung Basin Gas Hydrate Expedition 1&2. Many gas hydrates were interpreted to locate within chimney created by regional fault, intrusive rock, and massive debrite. Vent for 3D seismic is characterized by strong reflector with northeast and northwest lineation at seafloor, which is the one of the indicators of gas hydrate. Gas hydrate was also detected at the sandy layer which is situated close to faults/chimney and just above bottom simulating reflector. Fractures and faults are most likely to be the main migration pathways of transporting fluid and gas to gas hydrate stability zone. Upward diffuse fluid flow could also transport fluid and gas to gas hydrate stability zone. The occurrences of gas hydrate based on the patterns of gas migration and the places of gas hydrate formation in the Ulleung Basin include: (1) grain-displacing type (nodules, veins, layers) in muddy sediments and pore-filling type in sandy layer within localized chimney, (2) pore-filling type in sandy layer located close to faults/chimney, through which flow and gas migrated upward, and (3) pore-filling type in sandy layer just above the BSR due to fluid and gas transport by upward movement of diffusive fluid flow.
For the investigation of seismic characteristics of gas hydrate, three seismic reflection data sets (6,690 L-km of 2D set, 400 km2 and 300 km2 of 3D sets) were provided from the Ulleung Basin, East Sea in 2005, 2006 and 2008. Seismic characteristics of the gas hydrate are tested and analyzed in terms of chimney, bottom simulating reflector (BSR), acoustic blanking in turbidite including pore-filling hydrate in sand, strong reflector at/near to seafloor within vent site, and enhanced reflection. The various gas hydrate morphologies such as nodules, veins, layers in mud and pore-filling type in sandy layer were identified from the Ulleung Basin Gas Hydrate Expedition 1&2. Many gas hydrates were interpreted to locate within chimney created by regional fault, intrusive rock, and massive debrite. Vent for 3D seismic is characterized by strong reflector with northeast and northwest lineation at seafloor, which is the one of the indicators of gas hydrate. Gas hydrate was also detected at the sandy layer which is situated close to faults/chimney and just above bottom simulating reflector. Fractures and faults are most likely to be the main migration pathways of transporting fluid and gas to gas hydrate stability zone. Upward diffuse fluid flow could also transport fluid and gas to gas hydrate stability zone. The occurrences of gas hydrate based on the patterns of gas migration and the places of gas hydrate formation in the Ulleung Basin include: (1) grain-displacing type (nodules, veins, layers) in muddy sediments and pore-filling type in sandy layer within localized chimney, (2) pore-filling type in sandy layer located close to faults/chimney, through which flow and gas migrated upward, and (3) pore-filling type in sandy layer just above the BSR due to fluid and gas transport by upward movement of diffusive fluid flow.
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