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Continuous Dissolved Gas Tracing of Fracture‐Matrix Exchanges
Author(s) -
Hoffmann R.,
Goderniaux P.,
Jamin P.,
Chatton E.,
Bernardie J.,
Labasque T.,
Le Borgne T.,
Dassargues A.
Publication year - 2020
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2020gl088944
Subject(s) - tracer , fracture (geology) , matrix (chemical analysis) , helium , aquifer , advection , geology , diffusion , tracing , flux (metallurgy) , environmental science , mineralogy , groundwater , materials science , chemistry , geotechnical engineering , composite material , thermodynamics , computer science , physics , metallurgy , nuclear physics , organic chemistry , operating system
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 modeled. Results show that continuous dissolved gas tracing with multiple tracers provides key constrains on fracture‐matrix interactions and reveal unexpected scale effects in fracture‐matrix exchange rates.