Mapping the hydraulic connection between a coalbed and adjacent aquifer: example of the coal-seam gas resource area, north Galilee Basin, Australia; [Cartographier la connexion hydraulique entre une couche de houille et l’aquifère adjacent: exemple de la ressource en gaz de houille du bassin Galilée nord, Australie]; [Mapeamento a conexão hidráulica entre uma camada de carvão e o aquífero adjacente: exemplo de uma área de recurso de gás de veio de carvão, norte da Bacia da Galileia, Austrália]; [Mapeo de la conexión hidráulica entre una capa de carbón y el acuífero adyacente: ejemplo de una veta de carbón en un área de recursos gasíferos, norte de la Galilee Basin, Australia]

被引：0
作者：
Jiang Z. [1 ,2 ]
Mariethoz G. [3 ,4 ]
Schrank C. [2 ]
Cox M. [2 ]
Timms W. [5 ]
机构：
[1] Key Laboratory of Groundwater Resources and Environment, Ministry of Education, College of Environment and Resources, Jilin University, Changchun
[2] School of Earth, Environmental & Biological Sciences, Queensland University of Technology, Brisbane, 4001, QLD
[3] Institute of Earth Surface Dynamics, University of Lausanne, Lausanne
[4] School of Civil and Environmental Engineering, University of New South Wales, Sydney, 2052, NSW
[5] School of Mining Engineering, University of New South Wales, Sydney, 2052, NSW
来源：
Hydrogeology Journal | 2016年 / 24卷 / 8期
关键词：
Australia; Coal seam gas; Groundwater flow; Heterogeneity; Hydraulic connection;
D O I：
10.1007/s10040-016-1447-2
中图分类号：
学科分类号：
摘要：
Coal-seam gas production requires groundwater extraction from coal-bearing formations to reduce the hydraulic pressure and improve gas recovery. In layered sedimentary basins, the coalbeds are often separated from freshwater aquifers by low-permeability aquitards. However, hydraulic connection between the coalbed and aquifers is possible due to the heterogeneity in the aquitard such as the existence of conductive faults or sandy channel deposits. For coal-seam gas extraction operations, it is desirable to identify areas in a basin where the probability of hydraulic connection between the coalbed and aquifers is low in order to avoid unnecessary loss of groundwater from aquifers and gas production problems. A connection indicator, the groundwater age indictor (GAI), is proposed, to quantify the degree of hydraulic connection. The spatial distribution of GAI can indicate the optimum positions for gas/water extraction in the coalbed. Depressurizing the coalbed at locations with a low GAI would result in little or no interaction with the aquifer when compared to the other positions. The concept of GAI is validated on synthetic cases and is then applied to the north Galilee Basin, Australia, to assess the degree of hydraulic connection between the Aramac Coal Measure and the water-bearing formations in the Great Artesian Basin, which are separated by an aquitard, the Betts Creek Beds. It is found that the GAI is higher in the western part of the basin, indicating a higher risk to depressurization of the coalbed in this region due to the strong hydraulic connection between the coalbed and the overlying aquifer. © 2016, Springer-Verlag Berlin Heidelberg.
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页码：2143 / 2155
页数：12
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