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Numerical computation and case analysis of the venting process of free gas beneath hydrate layer
Su Zheng1,3; Cao Yun-Cheng1; Wu Neng-You1,3; Cathles, Lawrence M.2; Chen Duo-Fu1,3
2009-12-01
Source PublicationCHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
Volume52Issue:12Pages:3124-3131
AbstractA hydrate layer is an ideal capillary seal, beneath which free gas is trapped. Gas overpressure increases as gas accumulates and gas column grows. Capillary I seals have the property that they fall completely when gas pressure reaches the point that they are invaded by gas, and thereafter they offer little resistance to gas venting. After the seepage is triggered, the venting gas will push the overlying water upward at increasingly higher velocities as the gas "piston" approaches the seafloor. Numerical model shows that as the water velocity increases the near surface sediments will become quick at a depth that the resistance of water flow exceeds the hydrostatic pressure of the sediment hosting the water flow. These quick sediments can then be removed by bottom ocean currents, leaving a hollow pockmark on the seafloor. Thereafter, a free gas pathway is formed below the pockmarks and the reservoir gas drains quickly. The pockmark depth is a function of thickness of free gas column beneath the hydrate and depth of the hydrate seal (bottom of hydrate layer). Interestingly, pockmark depth does not depend on sediment permeability. Pockmark depth implies the resource amount of free gas beneath hydrate layer. The model shows that a 22-m-thick free gas layer at least is needed to form a 4-m-deep pockmark on the rise of Blake Ridge.
SubtypeArticle
KeywordGas Hydrate Capillary Seal Gas Seepage Pockmarks Blake Ridge
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.3969/j.issn.0001-5733.2009.12.022
WOS Subject ExtendedGeochemistry & Geophysics
WOS KeywordLOWER CONGO BASIN ; FLUID-FLOW ; SEA ; POCKMARKS ; CONSTRAINTS
Indexed BySCI
Language英语
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000273364200022
Citation statistics
Document Type期刊论文
Identifierhttp://ir.giec.ac.cn/handle/344007/10300
Collection中国科学院广州能源研究所
Affiliation1.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Marginal Sea Geol, Guangzhou 510640, Peoples R China
2.Cornell Univ, Dept Earth & Atmospher Sci, Ithaca, NY 14853 USA
3.Chinese Acad Sci, Guangzhou Inst Energy Convers, CAS Key Lab Renewable Energy & Gas Hydrate, CAS Guangzhou Ctr Gas Hydrate Res, Guangzhou 510640, Peoples R China
First Author AffilicationGuangZhou Institute of Energy Conversion,Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Su Zheng,Cao Yun-Cheng,Wu Neng-You,et al. Numerical computation and case analysis of the venting process of free gas beneath hydrate layer[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2009,52(12):3124-3131.
APA Su Zheng,Cao Yun-Cheng,Wu Neng-You,Cathles, Lawrence M.,&Chen Duo-Fu.(2009).Numerical computation and case analysis of the venting process of free gas beneath hydrate layer.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,52(12),3124-3131.
MLA Su Zheng,et al."Numerical computation and case analysis of the venting process of free gas beneath hydrate layer".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 52.12(2009):3124-3131.
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