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Influence of water flow on gas hydrate accumulation at cold vents
Cao YunCheng1,3; Su Zheng2; Chen DuoFu1
2013-04-01
Source PublicationSCIENCE CHINA-EARTH SCIENCES
Volume56Issue:4Pages:568-578
AbstractA 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.
SubtypeArticle
KeywordCold Vent Fluid Seepage Temperature Salinity Gas Hydrate Numerical Simulation
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1007/s11430-012-4553-6
WOS Subject ExtendedGeology
WOS KeywordGULF-OF-MEXICO ; CONTINENTAL-SLOPE ; CASCADIA MARGIN ; METHANE HYDRATE ; WORLDWIDE DISTRIBUTION ; CHLORIDE ENRICHMENT ; MARINE ENVIRONMENTS ; SOUTHERN SUMMIT ; STABILITY ZONE ; BUSH-HILL
Indexed BySCI
Language英语
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000317347200007
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.giec.ac.cn/handle/344007/10069
Collection中国科学院广州能源研究所
Affiliation1.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
Recommended Citation
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.
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