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Surface gas geochemistry above the natural CO2 reservoir of Montmiral (Drôme, France), source tracking and gas exchange between the soil, biosphere and atmosphere

Frédérick Gal 1 Karine Le Pierres 1 Michel Brach 1 Gilles Braibant 1 Claire Bény 1 Anne Battani 2 Eric Tocqué 2 Yves Benoît 2 Elodie Jeandel 2 Zbigniew Pokryszka 3 Arnaud Charmoille 3 Gaetan Bentivegna 3 Jacques Pironon 4 Philippe de Donato 5 Christophe Garnier 5 Cristelle Cailteau 5 Odile Barres 5 Giovanni Radilla 6 Allan Bauer 5
1 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)
2 IFPEN - IFP Energies nouvelles
3 INERIS - Institut National de l'Environnement Industriel et des Risques
4 G2R - Géologie et gestion des ressources minérales et énergétiques
5 LEM - Laboratoire Environnement et Minéralurgie
6 LEMTA - Laboratoire Énergies et Mécanique Théorique et Appliquée
Abstract : One of the options considered to mitigate greenhouse gas concentrations in the atmosphere is underground storage of CO2. There is a strong need for enhancing and developing methods that would help throughout the duration life of such underground storage, to ensure the safety and able to monitor the evolution of the injected CO2 plume. Among these, geochemical methods can play an important role. Here, we describe results acquired under the research programme “Géocarbone-Monitoring”, partially funded by the French National Research Agency, on the Montmiral natural analogue in South-Eastern France. Other results obtained under the same research programme in the French Massif Central are reported elsewhere in this volume.Spot sampling methods allowing a great geographical coverage and continuous measurements on selected points were undertaken in 2006 and 2007, in order to determine soil gas concentrations and fluxes as well as carbon isotope ratio determinations. One important result is that without any evidence of deep CO2 leakage, both CO2 concentrations and fluxes appear to be higher than can be explained only by biological activities. Further investigations are thus needed to understand the gas evolution better throughout the year.
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OGST | LEMTA-UL | UNIV-LORRAINE | CNRS | BRGM | INERIS | IFP

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Frédérick Gal, Karine Le Pierres, Michel Brach, Gilles Braibant, Claire Bény, et al.. Surface gas geochemistry above the natural CO2 reservoir of Montmiral (Drôme, France), source tracking and gas exchange between the soil, biosphere and atmosphere. Oil & Gas Science and Technology - Revue d'IFP Energies nouvelles, Institut Français du Pétrole, 2010, 65 (4), pp.635-652. ⟨10.2516/ogst/2009068⟩. ⟨hal-00556693⟩

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