In situ diffusion test of hydrogen gas in the Opalinus Clay

Agnès Vinsot; C. A. J. Appelo; M. Lundy; S. Wechner; Y. Lettry; Catherine Lerouge; A. M. Fernandez; M. Labat; Christophe Tournassat; P. de Canniere; B. Schwyn; J. Mckelvie; S. Dewonck; P. Bossart; J. Delay

doi:10.1144/SP400.12

Communication dans un congrès

In situ diffusion test of hydrogen gas in the Opalinus Clay

Agnès Vinsot ¹ C. A. J. Appelo ² M. Lundy ³ S. Wechner ⁴ Y. Lettry ⁵ Catherine Lerouge ⁶ A. M. Fernandez ^{7, 8} M. Labat ⁹ Christophe Tournassat ⁶ P. de Canniere ¹⁰ B. Schwyn ¹¹ J. Mckelvie S. Dewonck ¹ P. Bossart J. Delay

1 ANDRA - Agence Nationale pour la Gestion des Déchets Radioactifs

2 Hydrochemical Consultant

3 Centre for Irish Bat Research, School of Biological Sciences

4 Hydroisotop GmbH

5 solexperts

6 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)

7 Department of Plant Systems Biology

8 Department of Plant Biotechnology and Bioinformatics

9 IRD - Institut de Recherche pour le Développement

10 SCK-CEN - Centre d'Etude de l'Energie Nucléaire

11 NAGRA - NAGRA

Abstract : Hydrogen gas was injected, together with helium and neon, into a borehole in the low-diffusivity Opalinus Clay rock. The hydrogen partial pressure was at most 60 mbar. A water production flow rate from the surrounding rock of c. 15 ml/day had been obtained previously, indicating that the test interval wall was presumably saturated with water. Helium and neon concentrations decreased as expected while taking into account dissolution and diffusion processes in the porewater. In contrast, the disappearance rate of hydrogen observed (2×10−4 to 3×10−4 mol/day/m2) was c. 20 times larger than the calculated rate considering only dissolution and diffusion. The same rate was observed following a new hydrogen injection and over a six-month semi-continuous injection phase. Simultaneously, sulphate and iron concentrations decreased in the water, whereas sulphide became detectable. These evolutions may be due to biotic processes involving hydrogen oxidation, sulphate reduction and Fe(III) reduction.

Type de document :

Communication dans un congrès

Domaine :

Planète et Univers [physics] / Sciences de la Terre / Géochimie

Liste complète des métadonnées

https://hal-brgm.archives-ouvertes.fr/hal-01192886
Contributeur : Christophe Tournassat Connectez-vous pour contacter le contributeur
Soumis le : jeudi 3 septembre 2015 - 17:34:46
Dernière modification le : vendredi 11 février 2022 - 15:50:02

In situ diffusion test of hydrogen gas in the Opalinus Clay

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