Influence of water flow on gas hydrate accumulation at cold vents
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 o...
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ftchacadsciegiec:oai:ir.giec.ac.cn:344007/29603 2023-05-15T17:12:11+02:00 Influence of water flow on gas hydrate accumulation at cold vents 2013-01-01 http://ir.giec.ac.cn/handle/344007/29603 英语 eng SCIENCE CHINA-EARTH SCIENCES http://ir.giec.ac.cn/handle/344007/29603 GULF-OF-MEXICO CONTINENTAL-SLOPE CASCADIA MARGIN METHANE HYDRATE WORLDWIDE DISTRIBUTION CHLORIDE ENRICHMENT SOUTHERN SUMMIT THERMAL IMPACT STABILITY ZONE KINETIC-MODEL cold vent fluid seepage temperature salinity gas hydrate numerical simulation 期刊论文 2013 ftchacadsciegiec 2022-09-23T14:16:46Z 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 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. Report Methane hydrate Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences: GIEC OpenIR |
institution |
Open Polar |
collection |
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences: GIEC OpenIR |
op_collection_id |
ftchacadsciegiec |
language |
English |
topic |
GULF-OF-MEXICO CONTINENTAL-SLOPE CASCADIA MARGIN METHANE HYDRATE WORLDWIDE DISTRIBUTION CHLORIDE ENRICHMENT SOUTHERN SUMMIT THERMAL IMPACT STABILITY ZONE KINETIC-MODEL cold vent fluid seepage temperature salinity gas hydrate numerical simulation |
spellingShingle |
GULF-OF-MEXICO CONTINENTAL-SLOPE CASCADIA MARGIN METHANE HYDRATE WORLDWIDE DISTRIBUTION CHLORIDE ENRICHMENT SOUTHERN SUMMIT THERMAL IMPACT STABILITY ZONE KINETIC-MODEL cold vent fluid seepage temperature salinity gas hydrate numerical simulation Influence of water flow on gas hydrate accumulation at cold vents |
topic_facet |
GULF-OF-MEXICO CONTINENTAL-SLOPE CASCADIA MARGIN METHANE HYDRATE WORLDWIDE DISTRIBUTION CHLORIDE ENRICHMENT SOUTHERN SUMMIT THERMAL IMPACT STABILITY ZONE KINETIC-MODEL cold vent fluid seepage temperature salinity gas hydrate numerical simulation |
description |
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 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. |
format |
Report |
title |
Influence of water flow on gas hydrate accumulation at cold vents |
title_short |
Influence of water flow on gas hydrate accumulation at cold vents |
title_full |
Influence of water flow on gas hydrate accumulation at cold vents |
title_fullStr |
Influence of water flow on gas hydrate accumulation at cold vents |
title_full_unstemmed |
Influence of water flow on gas hydrate accumulation at cold vents |
title_sort |
influence of water flow on gas hydrate accumulation at cold vents |
publishDate |
2013 |
url |
http://ir.giec.ac.cn/handle/344007/29603 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_relation |
SCIENCE CHINA-EARTH SCIENCES http://ir.giec.ac.cn/handle/344007/29603 |
_version_ |
1766068976148807680 |