Geophysical and geochemical observations on actively seeping hydrocarbon gases on the south-eastern Yellow Sea continental shelf SCIE SCOPUS

Cited 13 time in WEB OF SCIENCE Cited 13 time in Scopus
Title
Geophysical and geochemical observations on actively seeping hydrocarbon gases on the south-eastern Yellow Sea continental shelf
Author(s)
Jeong, KS; Cho, JH; Kim, SR; Hyun, S; Tsunogai, U
KIOST Author(s)
Jeong, Kap Sik(정갑식)Cho, Jin Hyung(조진형)Hyun, Sangmin(현상민)
Publication Year
2004-02
Abstract
In the southeastern Yellow Sea, active seepage of hydrocarbon gases has been observed by high-resolution (3.5 kHz) seismic profiling both in 1987 and 2001, occurring through a large number of plumes from the topmost pre-Holocene sedimentary layer. It is strong enough to compensate for current speed, extending vertically up to the sea surface. The gas seepage often appears to be explosive to form craters and diapirs, although pockmarks are rare due to the redistribution of mobile palimpsest sands. In core-top seawater and sediments, the gases are characterized by high amounts of C-2, homogenous delta(13)C(1) values and a large difference (19.7parts per thousand on average) between delta(13)C(1) (-55.2 to -53.6parts per thousand PDB) and delta(13)C(2) (-36.8 to -32.5parts per thousand PDB) values. The gases are considered to be generated with a smaller amount of C-1 at the early thermal cracking stage of labile source materials, after which the C-2 gas is enriched in C-13 by diffusion or biological alternation at the generation or accumulation site. The homogenous delta(13)C(1) values may be one of the geochemical characteristics of gases acquired at depth which are less altered in the case of rapid diffusive gas migration to the seafloor.
ISSN
0276-0460
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/5305
DOI
10.1007/s00367-003-0164-8
Bibliographic Citation
GEO-MARINE LETTERS, v.24, no.1, pp.53 - 62, 2004
Publisher
SPRINGER-VERLAG
Subject
SHALLOW GAS; NATURAL-GAS; NORTH-SEA; CHINA-SEA; SEDIMENTS; METHANE; CARBON; BASIN; ACCUMULATIONS; FRACTIONATION
Type
Article
Language
English
Document Type
Article
Publisher
SPRINGER-VERLAG
Related Researcher
Research Interests

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

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