Submarine fluid flow system feeding methane emission in the northern South China Sea

doi:10.1111/bre.12839

CORC > 深海科学与工程研究所 > 中国科学院深海科学与工程研究所 > 深海科学研究部 > 深海地球物理与资源研究室

	Submarine fluid flow system feeding methane emission in the northern South China Sea
	Wang, Jiliang 2,6; Li, Ang 1,5; Wang, Lawrence Hongliang 4; Wu, Shiguo 6; Li, Qingping 3
刊名	BASIN RESEARCH
	2024
卷号	36 期号:1 页码:22
关键词	gas cloud gas hydrate mass transport deposit methane emission pipe
ISSN号	0950-091X
DOI	10.1111/bre.12839
英文摘要	Submarine fluid flow system can transport methane into ocean. However, its evolution is not fully understood, particularly methane migration through the gas hydrate stability zone (GHSZ) in deep-water settings. Here, we used 3D seismic and well-logging data to show the currently active fluid flow system in the northern South China Sea. It was interpreted to have two parts and they together feed intermittent methane emission. Three gas clouds have been seismically imaged beneath the base of gas hydrate stability zone (BGHSZ) and a set of new faults can be identified within them. Twenty-eight seismic pipes were found to penetrate three vertically stacked mass transport deposits (MTDs) above the gas clouds. Log-seismic correlation shows that the seismic reflections in the pipe represent MTD sediment, bulk carbonate and gas hydrate- or free gas-bearing sediments. We interpreted faults and pipes as the main migration conduits below and above the BGHSZ respectively. The MTD within the GHSZ could seal the underlying free gas transported by faults and thus overpressure built up at the base prior to the occurrences of the pipes and the fracturing through the overlying sedimentary succession. Subsequently, focused fluid flow entered the GHSZ, with the methane probably bypassing the GHSZ before pore clogging of gas hydrates occurred. Additionally, mapping of high-amplitude reflections surrounding the upper portion of gas clouds reveals the relict free gas associated with three paleo-GHSZ bases. Episodic emplacements of new MTDs repeatedly caused the upward shifts of the BGHSZ and the resultant gas hydrate dissociation, contributing to methane emission. We proposed that the occurrences of MTDs may facilitate methane emission by intermittently trapping methane and inducing gas hydrate dissociation in deep-water settings. Schematic model showing the submarine fluid flow system feeding methane emassion in the northern South China Sea.image
资助项目	Laoshan Laboratory[422RC747] ; Laoshan Laboratory[LSKJ202203501] ; Natural Science Foundation of Hainan Province, China[42376069] ; Natural Science Foundation of China[2019360] ; Youth Innovation Promotion Association, Chinese Academy of Sciences
WOS关键词	DEEP-WATER AREA ; GAS HYDRATE SYSTEMS ; QIONGDONGNAN BASIN ; NATURAL GASES ; COLD SEEPS ; OFFSHORE ; ORIGIN ; GEOCHEMISTRY ; SUBSIDENCE ; LEAKAGE
WOS研究方向	Geology
语种	英语
出版者	WILEY
WOS记录号	WOS:001142183600001
资助机构	Laoshan Laboratory ; Natural Science Foundation of Hainan Province, China ; Natural Science Foundation of China ; Youth Innovation Promotion Association, Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.idsse.ac.cn/handle/183446/10822]
专题	深海科学研究部_深海地球物理与资源研究室
通讯作者	Wang, Jiliang; Li, Ang
作者单位	1.Minist Nat Resources, Qingdao Inst Marine Geol, Key Lab Gas Hydrate, Qingdao, Peoples R China 2.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China 3.China Natl Offshore Oil Corp, Beijing Res Ctr, Beijing, Peoples R China 4.Inst Energy Technol, Dept Reservoir Technol, Oslo, Norway 5.Qingdao Inst Marine Geol, Key Lab Gas Hydrate, Minist Nat Resources, Qingdao, Peoples R China 6.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya, Peoples R China
推荐引用方式 GB/T 7714	Wang, Jiliang,Li, Ang,Wang, Lawrence Hongliang,et al. Submarine fluid flow system feeding methane emission in the northern South China Sea[J]. BASIN RESEARCH,2024,36(1):22.
APA	Wang, Jiliang,Li, Ang,Wang, Lawrence Hongliang,Wu, Shiguo,&Li, Qingping.(2024).Submarine fluid flow system feeding methane emission in the northern South China Sea.BASIN RESEARCH,36(1),22.
MLA	Wang, Jiliang,et al."Submarine fluid flow system feeding methane emission in the northern South China Sea".BASIN RESEARCH 36.1(2024):22.