DOI: 10.1002/2015GL066060
论文题名: Crack extension induced by dissociation of fracture-hosted methane gas hydrate
作者: Jin Z.-H. ; Johnson S.E. ; Cook A.E.
刊名: Geophysical Research Letters
ISSN: 0094-9465
EISSN: 1944-9196
出版年: 2015
卷: 42, 期: 20 起始页码: 8522
结束页码: 8529
语种: 英语
英文关键词: crack extension
; hydrate dissociation
; hydrate-filled fracture
; natural gas hydrate
Scopus关键词: Crack propagation
; Cracks
; Dissociation
; Elastic moduli
; Equations of state
; Equations of state of gases
; Fracture mechanics
; Fracture toughness
; Gases
; Hydration
; Methane
; Natural gas
; Sediments
; Crack development
; Crack extension
; Equation of state
; Filled fracture
; Hydrate dissociation
; Methane gas hydrates
; Unstable crack growth
; Vertical fracture
; Gas hydrates
; buoyancy
; crack
; crack propagation
; equation of state
; fracture
; fracture mechanics
; fracture toughness
; kinetics
; methane
; permeability
; sediment property
; Young modulus
英文摘要: We investigate extension of a vertical crack filled by water and methane gas induced by dissociation of methane hydrate in low-permeability muddy sediment. We model the sediment as an impermeable elastic medium and consider a thin sheet configuration of hydrate that initially occupies a vertical fracture. The crack development and the amount of dissociated hydrate are determined using sediment elasticity, fracture mechanics, kinetics of hydrate dissociation, and the equation of state for methane gas. Young's modulus and fracture toughness of the sediment greatly affect the mass of hydrate required for crack extension; lower Young's modulus and higher fracture toughness require greater hydrate mass to induce unstable, buoyancy-driven crack propagation. Our numerical results suggest that propagation of gas/water-filled cracks occurs quickly in a matter of seconds and may be an important mechanism for methane transport in low-permeability sediments when hydrate-filled fractures are under conditions of gas hydrate dissociation. Key Points Dissociation of hydrate in fractures can release significant gas volumes Unstable crack growth occurs quickly (seconds) at the onset of dissociation Hydrate dissociation-induced cracking may be an important mechanism for methane transport © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84946615328&doi=10.1002%2f2015GL066060&partnerID=40&md5=cbb623266ed1ef81ec4f7f03130e95b6
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9080
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Mechanical Engineering, University of Maine, Orono, ME, United States
Recommended Citation:
Jin Z.-H.,Johnson S.E.,Cook A.E.. Crack extension induced by dissociation of fracture-hosted methane gas hydrate[J]. Geophysical Research Letters,2015-01-01,42(20).