Natural gas extraction and artificial gas injection experiments in Opalinus Clay, Mont Terri rock laboratory (Switzerland)

Abstract : Two experiments have been installed at Mont Terri in 2004 and 2009 that allowed gas circulation within a borehole at a pressure between 1 and 2 bar. These experiments made it possible to observe the natural gases that were initially dissolved in pore-water degassing into the borehole and to monitor their content evolution in the borehole over several years. They also allowed for inert (He, Ne) and reactive (H2) gases to be injected into the borehole with the aim either to determine their diffusion properties into the rock pore-water or to evaluate their removal reaction kinetics. The natural gases identified were CO2, light alkanes, He, and more importantly N2. The natural concentration of four gases in Opalinus Clay pore-water was evaluated at the experiment location: N2 2.2 mmol/L ± 25%, CH4 0.30 mmol/L ± 25%, C2H6 0.023 mmol/L ± 25%, C3H8 0.012 mmol/L ± 25%. Retention properties of methane, ethane, and propane were estimated. Ne injection tests helped to characterize rock diffusion properties regarding the dissolved inert gases. These experimental results are highly relevant towards evaluating how the fluid composition could possibly evolve in the drifts of a radioactive waste disposal facility.
Document type :
Journal articles
Complete list of metadatas

https://hal-insu.archives-ouvertes.fr/insu-01476435
Contributor : Catherine Cardon <>
Submitted on : Saturday, May 6, 2017 - 1:29:57 PM
Last modification on : Wednesday, May 15, 2019 - 3:45:42 AM
Long-term archiving on : Monday, August 7, 2017 - 12:23:39 PM

File

VINSOT.pdf
Publisher files allowed on an open archive

Identifiers

Citation

Agnès Vinsot, C. Anthony J. Appelo, Mélanie Lundy, Stefan Wechner, Cristelle Cailteau-Fischbach, et al.. Natural gas extraction and artificial gas injection experiments in Opalinus Clay, Mont Terri rock laboratory (Switzerland). Swiss Journal of Geosciences, Springer, 2017, 110 (1), pp.375-390. ⟨10.1007/s00015-016-0244-1⟩. ⟨insu-01476435⟩

Share

Metrics

Record views

466

Files downloads

130