Characteristics and formation mechanism of cold seep system in the northeastern continental slope of South China Sea from sub-bottom profiler data

doi:10.6038/cjg20150122

	Characteristics and formation mechanism of cold seep system in the northeastern continental slope of South China Sea from sub-bottom profiler data
	Liu Bo-Ran 1,2; Song Hai-Bin 3; Guan Yong-Xian 4; Bai Yang 3; Chen Jiang-Xin 1,2; Geng Ming-Hui 1,2
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2015
卷号	58 期号:1 页码:247-256
关键词	Cold seep Sub-bottom profiler Shallow gas Acoustic void Fluid migration
ISSN号	0001-5733
DOI	10.6038/cjg20150122
文献子类	Article
英文摘要	Gas Hydrate reservoir in the northeastern continental slope of South China Sea(SCS) have been confirmed by investigations and well drillings. Also, large amounts of methane-derived authigenic carbonates (MADC) were discovered in 2004 among this area. Based on sub-bottom profiles and seismic profiles, attributes and features associated with cold seepage system in the northeastern continental slope of SCS were analyzed. A seismic line cross the northeastern continental slope of SCS was used to show local sedimentary environment. Sub-bottom data were pieced together and denoised. Shallow gas, fluid migration and morphology features associated with cold seepage in processed sub-bottom profile were identified and discussed, with assistance of corresponding seismic lines and bathymetric charts. From observation of sub-bottom profiles and comparison with seismic and bathymetry data, cold seepage related features were listed as follow: (1) Acoustic plume (suspected of being cold seep) was found in a sub-bottom profile, with height of about 30 meters and width of 50 meters. (2) Mud volcanoes were found in this area, and caused discontinuity of Bottom Simulating Reflectors in seismic profiles. (3) Acoustic voids, the most frequent features in this region, had two types: "narrow" acoustic void and "broad" acoustic void. "narrow" acoustic void had width of 80 similar to 400 m and no layers information, "broad" acoustic void had width over 1000m and weak layers information. (4) The area of "narrow" acoustic void overlaid with mud volcanoes concentrated area, and the acoustic plume was located around "broad" acoustic voids. Cold seepage activities exist on the northeastern continental slope of SCS, both in history and in present. The results suggest that "narrow" acoustic voids on sub-bottom profiler correspond to fluid migration path, while "broad" acoustic voids possibly related with shallow gas accumulation along rock layers. The relationship between cold seepage system and gas hydrate in the northeastern continental slope of SCS worth further investigation.
WOS关键词	MUD VOLCANOS ; METHANE SEEPS ; SHALLOW GAS ; CARBONATES ; SEDIMENTS ; FEATURES ; HYDRATE ; MARGIN ; FLOOR ; GULF
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000349136200022
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/86812]
专题	中国科学院地质与地球物理研究所
通讯作者	Liu Bo-Ran
作者单位	1.Chinese Acad Sci, Key Lab Petr Resources Res, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China 4.Guangzhou Marine Geol Survey, Guangzhou 510075, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Liu Bo-Ran,Song Hai-Bin,Guan Yong-Xian,et al. Characteristics and formation mechanism of cold seep system in the northeastern continental slope of South China Sea from sub-bottom profiler data[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2015,58(1):247-256.
APA	Liu Bo-Ran,Song Hai-Bin,Guan Yong-Xian,Bai Yang,Chen Jiang-Xin,&Geng Ming-Hui.(2015).Characteristics and formation mechanism of cold seep system in the northeastern continental slope of South China Sea from sub-bottom profiler data.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,58(1),247-256.
MLA	Liu Bo-Ran,et al."Characteristics and formation mechanism of cold seep system in the northeastern continental slope of South China Sea from sub-bottom profiler data".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 58.1(2015):247-256.