ORIGINS AND DISTRIBUTION PATTERNS OF SHALLOW GAS IN THE SOUTHEASTERN COASTAL AREA OF KOREA

Title
ORIGINS AND DISTRIBUTION PATTERNS OF SHALLOW GAS IN THE SOUTHEASTERN COASTAL AREA OF KOREA
Author(s)
조진형; 정갑식; 석봉출; 김성렬; U Tsunogai
KIOST Author(s)
Cho, Jin Hyung(조진형)Jeong, Kap Sik(정갑식)
Publication Year
2008-09-26
Abstract
In the mud-belt off the southeast of Korea, geophysical and geochemical survey from sedimentary layer to water column was performed to confirm the shallow gas accumulation and gas release features. The active seepage of hydrocarbon gases has been observed by high-resolution (3.5 kHz) seismic profiling both in March and July 2007, occurring through up to 120 plumes from the topmost sedimentary layer. The gas seepage appears to be explosive to form craters, although pockmarks are rare. In water column and sediments, the stable carbon isotopes in gases are characterized by large difference between δ13C (-59.8 to -48.6 ‰ PDB) of seawater and δ13C (-62.0 to -39.7‰ PDB) of sediments, respectively. The biogenic gases are considered to be generated from high amount of organic carbon (1.5-4.0%) in the sedimentary layer with mixing of small amount of thermogenic gas which derived through faults.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/29809
Bibliographic Citation
지구과학회 추계학술대회, pp.45 - 49, 2008
Publisher
대한지구과학회
Type
Conference
Language
English
Publisher
대한지구과학회
Related Researcher
Research Interests

Marine Geology,Marine Geochemistry,Marine Security and Safety Research,해양지질,해양지화학,해양방위

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