Origins and Distribution Patterns of Seabed-derived Shallow Gas in the southwestern Coastal Area, East Sea

DC Field Value Language
dc.contributor.author 조진형 -
dc.contributor.author 신동혁 -
dc.contributor.author 정갑식 -
dc.contributor.author 이철구 -
dc.contributor.author 모태준 -
dc.contributor.author 이승용 -
dc.contributor.author 금병철 -
dc.contributor.author 장석 -
dc.date.accessioned 2020-07-15T18:50:50Z -
dc.date.available 2020-07-15T18:50:50Z -
dc.date.created 2020-02-11 -
dc.date.issued 2017-04-07 -
dc.identifier.uri https://sciwatch.kiost.ac.kr/handle/2020.kiost/24187 -
dc.description.abstract In the mud-belt off the southeastern coast of Korea, geophysical and geochemical survey from sedimentary layer to water column was performed to confirm the accumulation and release of hydrocarbon gases in the shallow depth of sedimentary layer. The active seepage has been observed by high-resolution (3.5 kHz) seismic profiling that occurs through up to 120 plumes from the topmost sedimentary layer. The plumes are hydro-acoustically detected in the area of 2.7 km2, from 20 to 50 m in water depth range, and found rare In deeper depth. The gas plumes are reached vertically up to 25 m from the seafloor. The gas seepage appears to be explosive enough to form craters, although pockmarks are rare. The carbon isotopes (δ13C) of gases in the sediments (-62.0 to &#8211 39.7 ‰ PDB) are characteristically differentiated from the seawater (-59.8 to &#8211 48.6 ‰ PDB). The gases are considered to be generated from abundant organic carbon (1.5 to 4.0%) in the sedimentary layer and mixed of small amounts of thermogenic gas which are derived from the underlying older sedimentary rocks.ayer. The active seepage has been observed by high-resolution (3.5 kHz) seismic profiling that occurs through up to 120 plumes from the topmost sedimentary layer. The plumes are hydro-acoustically detected in the area of 2.7 km2, from 20 to 50 m in water depth range, and found rare In deeper depth. The gas plumes are reached vertically up to 25 m from the seafloor. The gas seepage appears to be explosive enough to form craters, although pockmarks are rare. The carbon isotopes (δ13C) of gases in the sediments (-62.0 to &#8211 39.7 ‰ PDB) are characteristically differentiated from the seawater (-59.8 to &#8211 48.6 ‰ PDB). The gases are considered to be generated from abundant organic carbon (1.5 to 4.0%) in the sedimentary layer and mixed of small amounts of thermogenic gas which are derived from the underlying older sedimentary rocks. -
dc.description.uri 2 -
dc.language English -
dc.publisher 한국지구과학회 -
dc.relation.isPartOf 한국지구과학회 춘계학술발표회 -
dc.title Origins and Distribution Patterns of Seabed-derived Shallow Gas in the southwestern Coastal Area, East Sea -
dc.type Conference -
dc.citation.conferencePlace KO -
dc.citation.endPage 112 -
dc.citation.startPage 108 -
dc.citation.title 한국지구과학회 춘계학술발표회 -
dc.contributor.alternativeName 조진형 -
dc.contributor.alternativeName 신동혁 -
dc.contributor.alternativeName 정갑식 -
dc.contributor.alternativeName 이철구 -
dc.contributor.alternativeName 모태준 -
dc.contributor.alternativeName 이승용 -
dc.contributor.alternativeName 금병철 -
dc.contributor.alternativeName 장석 -
dc.identifier.bibliographicCitation 한국지구과학회 춘계학술발표회, pp.108 - 112 -
dc.description.journalClass 2 -
Appears in Collections:
Sea Power Enhancement Research Division > Marine Domain & Security Research Department > 2. Conference Papers
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