气候变化领域集成服务门户(CCPortal): Crustal fingering facilitates free-gas methane migration through the hydrate stability zone

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DOI	10.1073/pnas.2011064117
	Crustal fingering facilitates free-gas methane migration through the hydrate stability zone
	Fu X.; Jimenez-Martinez J.; Nguyen T.P.; William Carey J.; Viswanathan H.; Cueto-Felgueroso L.; Juanes R.
发表日期	2020
ISSN	0027-8424
起始页码	31660
结束页码	31664
卷号	117 期号:50
英文摘要	Widespread seafloor methane venting has been reported in many regions of the world oceans in the past decade. Identifying and quantifying where and how much methane is being released into the ocean remains a major challenge and a critical gap in assessing the global carbon budget and predicting future climate [C. Ruppel, J. D. Kessler. Rev. Geophys. 55, 126-168 (2017)]. Methane hydrate (CH4 · 5.75H2O) is an ice-like solid that forms from methane-water mixture under elevated-pressure and low-temperature conditions typical of the deep marine settings (>600-m depth), often referred to as the hydrate stability zone (HSZ). Wide-ranging field evidence indicates that methane seepage often coexists with hydrate-bearing sediments within the HSZ, suggesting that hydrate formation may play an important role during the gas-migration process. At a depth that is too shallow for hydrate formation, existing theories suggest that gas migration occurs via capillary invasion and/or initiation and propagation of fractures (Fig. 1). Within the HSZ, however, a theoretical mechanism that addresses the way in which hydrate formation participates in the gas-percolation process is missing. Here, we study, experimentally and computationally, the mechanics of gas percolation under hydrate-forming conditions. We uncover a phenomenon-crustal fingering-and demonstrate how it may control methane-gas migration in ocean sediments within the HSZ. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Methane hydrate; Microfluidics; Pattern formation; Phase-Field method
语种	英语
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160689
作者单位	Fu, X., Department of Earth and Planetary Science, University of California, Berkeley, CA 94670, United States, Department of Mechanical and Civil Engineering, California Institute of Technology, Pasadena, CA 91125, United States; Jimenez-Martinez, J., Department of Water Resources and Drinking Water, Swiss Federal Institute of Aquatic Science and Technology, Dubendorf, 8600, Switzerland, Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United States, Department of Civil, Environmental and Geomatic Engineering, Swiss Federal Institute of Technology, Zurich, 8093, Switzerland; Nguyen, T.P., Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United States; William Carey, J., Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United States; Viswanathan, H., Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United State...
推荐引用方式 GB/T 7714	Fu X.,Jimenez-Martinez J.,Nguyen T.P.,et al. Crustal fingering facilitates free-gas methane migration through the hydrate stability zone[J],2020,117(50).
APA	Fu X..,Jimenez-Martinez J..,Nguyen T.P..,William Carey J..,Viswanathan H..,...&Juanes R..(2020).Crustal fingering facilitates free-gas methane migration through the hydrate stability zone.Proceedings of the National Academy of Sciences of the United States of America,117(50).
MLA	Fu X.,et al."Crustal fingering facilitates free-gas methane migration through the hydrate stability zone".Proceedings of the National Academy of Sciences of the United States of America 117.50(2020).