Article (Scientific journals)
Continuous dissolved gas tracing of fracture‐matrix exchanges
Hoffmann, Richard; Goderniaux, Pascal; Jamin, Pierre et al.
2020In Geophysical Research Letters
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Keywords :
Dissolved gas tracing; Diffusion; Chalk; Double porosity; Fractured rock; fracture-matrix interactions
Abstract :
[en] Transport in fractured media plays an important role in a range of processes, from rock weathering and microbial processes to contaminant transport, and energy extraction and storage. Diffusive transfer between the fracture fluid and the rock matrix is often a key element in these applications. But the multiscale heterogeneity of fractures renders the field assessment of these processes extremely challenging. This study explores the use of dissolved gases as tracers of fracture‐matrix interactions, which can be measured continuously and highly accurately using mobile mass spectrometers. Since their diffusion coefficients vary significantly, multiple gases are used to probe different scales of fracture‐matrix exchanges. Tracer tests with helium, xenon and argon were performed in a fractured chalk aquifer and resulting tracer breakthrough curves are modelled. Results show that continuous dissolved gas tracing with multiple tracers provide key constrains on fracture matrix interactions and reveal unexpected scale effects in fracture‐matrix exchange rates.
Disciplines :
Geological, petroleum & mining engineering
Author, co-author :
Hoffmann, Richard ;  Université de Liège - ULiège > Form. doct. sc. ingé. & techn. (archi., gén. civ. - paysage)
Goderniaux, Pascal;  Université de Mons - UMONS > Polytech Mons > Geology and Applied Geology
Jamin, Pierre ;  Université de Liège - ULiège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Chatton, Eliot;  Université de Rennes 1
de La Bernardie, Jérôme;  Université de Rennes 1
Labasque, Thierry;  Université de Rennes 1
Le Borgne, Tanguy;  Université de Rennes 1
Dassargues, Alain  ;  Université de Liège - ULiège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Language :
English
Title :
Continuous dissolved gas tracing of fracture‐matrix exchanges
Publication date :
21 August 2020
Journal title :
Geophysical Research Letters
ISSN :
0094-8276
eISSN :
1944-8007
Publisher :
Wiley, Washington, United States - District of Columbia
Peer reviewed :
Peer Reviewed verified by ORBi
European Projects :
H2020 - 722028 - ENIGMA - European training Network for In situ imaGing of dynaMic processes in heterogeneous subsurfAce environments
Name of the research project :
ITN ENIGMA
Critex project
Condate EAU
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
CE - Commission Européenne [BE]
Funding number :
The Belgian Fonds de la Recherche Scientifique- FNRS under Grant n° J.0115.15
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since 02 September 2020

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