Influence of water flow on gas hydrate accumulation at cold vents

doi:10.1007/s11430-012-4553-6

GIEC OpenIR > 中国科学院广州能源研究所

	Influence of water flow on gas hydrate accumulation at cold vents
	Cao YunCheng 1,3; Su Zheng2 ; Chen DuoFu 1
	2013-04-01
发表期刊	SCIENCE CHINA-EARTH SCIENCES
卷号	56 期号:4 页码:568-578
摘要	A cold vent is an area where methane-rich fluid seepage occurs. This seepage may alter the local temperature, salinity, and subsequent accumulation of the gas hydrate. Using a kinetic gas hydrate formation model and in situ measurement of temperature, salinity and fluid flux at the southern summit of Hydrate Ridge, we simulate the gas hydrate accumulation at three distinct fluid sites: clam, bacterial mat, and gas discharge sites. At the clam sites (pore water flux < 20 kg m(-2) yr(-1)), pore water advection has little influence on temperature and salinity. However, the salinity and temperature are increased (peak salinity > 0.8 mol kg(-1)) by the formation of gas hydrate causing the base of the hydrate stability zone to move gradually from similar to 115 to similar to 70 meters below seafloor (mbsf). The gas hydrate saturation at the clam sites is relatively high. The water flux at the bacterial mat sites ranges from 100 to 2500 kg m(-2) yr(-1). The water flow suppresses the increase in salinity resulting in a salinity close to or slightly higher than that of seawater (< 0.65 mol kg(-1)). Heat advection by water flow increases temperature significantly, shifting the base of the hydrate stability zone to above 50 or even 3 mbsf. The gas hydrate saturation is relatively low at the bacterial mat site. At the gas discharge sites, the pore water flux could reach 10(10) kg m(-2) yr(-1), and the temperature could reach that of the source area in 9 min. There is no gas hydrate formation at the gas discharge sites. Our simulative analysis therefore reveals that a lower pore water flux would result in lower salinity, higher temperature, and a shallower base of the hydrate stability zone. This in turn induces a lower gas hydrate formation rate, lower hydrate saturation, and eventually less gas hydrate resources.
文章类型	Article
关键词	Cold Vent Fluid Seepage Temperature Salinity Gas Hydrate Numerical Simulation
WOS标题词	Science & Technology ; Physical Sciences
DOI	10.1007/s11430-012-4553-6
研究领域[WOS]	Geology
关键词[WOS]	GULF-OF-MEXICO ; CONTINENTAL-SLOPE ; CASCADIA MARGIN ; METHANE HYDRATE ; WORLDWIDE DISTRIBUTION ; CHLORIDE ENRICHMENT ; MARINE ENVIRONMENTS ; SOUTHERN SUMMIT ; STABILITY ZONE ; BUSH-HILL
收录类别	SCI
语种	英语
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000317347200007
引用统计	被引频次：7[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.giec.ac.cn/handle/344007/10069
专题	中国科学院广州能源研究所
作者单位	1.Chinese Acad Sci, Key Lab Marginal Sea Geol, Guangzhou 510640, Peoples R China 2.Chinese Acad Sci, Key Lab Renewable Energy & Nat Gas Hydrate, Guangzhou 510640, Peoples R China 3.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Cao YunCheng,Su Zheng,Chen DuoFu. Influence of water flow on gas hydrate accumulation at cold vents[J]. SCIENCE CHINA-EARTH SCIENCES,2013,56(4):568-578.
APA	Cao YunCheng,Su Zheng,&Chen DuoFu.(2013).Influence of water flow on gas hydrate accumulation at cold vents.SCIENCE CHINA-EARTH SCIENCES,56(4),568-578.
MLA	Cao YunCheng,et al."Influence of water flow on gas hydrate accumulation at cold vents".SCIENCE CHINA-EARTH SCIENCES 56.4(2013):568-578.