DOI: 10.1016/j.epsl.2018.07.036
Scopus记录号: 2-s2.0-85050866807
论文题名: Burial-driven methane recycling in marine gas hydrate systems
作者: Nole M. ; Daigle H. ; Cook A.E. ; Malinverno A. ; Flemings P.B.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 499 起始页码: 197
结束页码: 204
语种: 英语
英文关键词: gas hydrate
; marine geosystems
; multiphase flow
; numerical simulation
; petrophysics
Scopus关键词: Computational fluid dynamics
; Computer simulation
; Gases
; Hydration
; Methane
; Multiphase flow
; Natural gasoline plants
; Pore size
; Recycling
; Seismology
; Stability
; Capillary phenomena
; Geosystems
; Hydrate stabilities
; Marine gas hydrates
; Multiphase transport
; Petrophysics
; Pressure and temperature
; Quantitative description
; Gas hydrates
; computer simulation
; gas hydrate
; hydrocarbon migration
; marine ecosystem
; methane
; multiphase flow
; numerical model
; recycling
英文摘要: Natural gas hydrate may be buried with sediments until it is no longer stable at a given pressure and temperature, resulting in conversion of hydrate into free gas. This gas may migrate upward and recycle back into the hydrate stability zone to form hydrate. As of yet, however, no quantitative description of the methane recycling process has been developed using multiphase flow simulations to model burial-driven gas hydrate recycling. In this study, we present a series of 1D multiphase transport simulations to investigate the methane recycling process in detail. By invoking the effects of capillary phenomena on hydrate and gas formation in pores of varying size, we find that a free gas phase can migrate a significant distance above the bulk base of hydrate stability. Since the top of the free gas occurrence is often identified as the base of the hydrate stability zone from seismic data, our results demonstrate that not only could this assumption mischaracterize a hydrate system, but that under recycling conditions the highest hydrate saturations can occur beneath the top of the free gas occurrence. We show that the presence of pore size distributions requires a replacement zone through which hydrate saturations progressively decrease with depth and are replaced with free gas. This replacement zone works to buffer against significant gas buildup that could lead to fracturing of overlying sediments. This work provides a framework for simulating flow and transport of methane within the 3-phase stability zone from a mass conservation perspective. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109703
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Hildebrand Department of Petroleum and Geosystems Engineering, University of Texas at Austin, Austin, TX, United States; School of Earth Sciences, The Ohio State University, Columbus, OH, United States; Lamont Doherty Earth Observatory of Columbia University, Palisades, NY, United States; Jackson School of Geosciences, University of Texas at Austin, Austin, TX, United States
Recommended Citation:
Nole M.,Daigle H.,Cook A.E.,et al. Burial-driven methane recycling in marine gas hydrate systems[J]. Earth and Planetary Science Letters,2018-01-01,499