DOI: 10.1038/ngeo2919
论文题名: Mobility and persistence of methane in groundwater in a controlled-release field experiment
作者: Cahill A.G. ; Steelman C.M. ; Forde O. ; Kuloyo O. ; Emil Ruff S. ; Mayer B. ; Ulrich Mayer K. ; Strous M. ; Cathryn Ryan M. ; Cherry J.A. ; Parker B.L.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 4 起始页码: 289
结束页码: 294
语种: 英语
Scopus关键词: advection
; aquifer
; experimental study
; field method
; gas flow
; groundwater
; methane
; mobility
; persistence
; shale gas
; vadose zone
英文摘要: Expansion of shale gas extraction has fuelled global concern about the potential impact of fugitive methane on groundwater and climate. Although methane leakage from wells is well documented, the consequences on groundwater remain sparsely studied and are thought by some to be minor. Here we present the results of a 72-day methane gas injection experiment into a shallow, flat-lying sand aquifer. In our experiment, although a significant fraction of methane vented to the atmosphere, an equal portion remained in the groundwater. We find that methane migration in the aquifer was governed by subtle grain-scale bedding that impeded buoyant free-phase gas flow and led to episodic releases of free-phase gas. The result was lateral migration of gas beyond that expected by groundwater advection alone. Methane persisted in the groundwater zone despite active growth of methanotrophic bacteria, although much of the methane that vented into the vadose zone was oxidized. Our findings demonstrate that even small-volume releases of methane gas can cause extensive and persistent free phase and solute plumes emanating from leaks that are detectable only by contaminant hydrogeology monitoring at high resolution. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105800
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: G360 Institute for Groundwater Research, University of Guelph, Ontario, Canada; Department of Earth, Ocean and Atmospheric Science, University of British Columbia, British Columbia, Canada; Department of Geoscience, University of Calgary, Calgary, AB, Canada
Recommended Citation:
Cahill A.G.,Steelman C.M.,Forde O.,et al. Mobility and persistence of methane in groundwater in a controlled-release field experiment[J]. Nature Geoscience,2017-01-01,10(4)