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A compositional kinetic model of hydrate crystallization and dissolution
Cathles, LM; Chen, DF; cathles@geology.cornell.edu
2004
发表期刊JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
ISSN0148-0227
卷号109期号:B8页码:-B8124
摘要Hydrates are crystallizing near and at the seafloor from gas vents on shelves where the sedimentation rate is high and hydrocarbons are being generated. When seafloor temperature, vent rate, or vent gas composition changes, these hydrates may become unstable and decompose. We have constructed a compositional kinetic model of hydrate crystallization and dissolution that can address these issues. The model crystallizes hydrate in compositional bins and allows each to dissolve at either a kinetically or compositionally controlled rate if vent gas composition or temperature causes it to become unstable. We empirically calibrate the model to venting at the Bush Hill hydrate mound in the offshore Louisiana Gulf of Mexico, show how variations in venting rate crystallize hydrate of diverse composition in the subsurface, and investigate how bottom water temperature variations similar to those measured could increase the rate of gas venting by destabilizing hydrates within a few meters of the seafloor. We show that increases in bottom water temperature can cause gas venting rates to increase similar to100%, as suggested by recent measurements, only if the dissolution kinetics are fast compared to the empirically calibrated crystallization kinetics and dissolution gases are removed rapidly enough that they do not thermodynamically inhibit the rate of dissolution. Model characteristics required to further investigate hydrate mound construction are identified.
部门归属Cornell Univ, Dept Earth & Atmospher Sci, Ithaca, NY 14853 USA; Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Marginal Sea Geol, Guangzhou 510640, Guangdong, Peoples R China; Chinese Acad Sci, S China Sea Inst Oceanol, Wushan, Peoples R China; Chinese Acad Sci, Gas Hydrate Res Ctr, Wushan, Peoples R China
关键词Compositional Kinetic Model Gas Venting Hydrate Crystallization Dissolution Methane Seafloor Seep
学科领域Geochemistry & Geophysics
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收录类别sci
资助项目海洋地质
WOS记录号WOS:000223345000001
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被引频次:19[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/4794
专题中科院边缘海地质重点实验室
通讯作者cathles@geology.cornell.edu
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Cathles, LM,Chen, DF,cathles@geology.cornell.edu. A compositional kinetic model of hydrate crystallization and dissolution[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2004,109(B8):-B8124.
APA Cathles, LM,Chen, DF,&cathles@geology.cornell.edu.(2004).A compositional kinetic model of hydrate crystallization and dissolution.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,109(B8),-B8124.
MLA Cathles, LM,et al."A compositional kinetic model of hydrate crystallization and dissolution".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 109.B8(2004):-B8124.
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