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Métrologie des pressions partielles de gaz (CO2 et CH4) à l'équilibre avec les eaux de formation des marnes de Bure (Meuse - Hte Marne, France) et Mont Terri (St Ursanne, Suisse) : interprétation des mécanismes de transfert de gaz après forage

Abstract : An infrared sensor (IRTF) and an innovative Raman optical bench were implemented and developed in underground laboratories to improve our knowledge about migration mechanisms of dissolved gases (CO2 and CH4). This study is focussed on the characterisation of the initial state of the porewater of Callovo-Oxfordian marl (Bure) and Opalinus Clay (Mt Terri Middle Jurassic). These sensors are integrated into experimental devices of gas-equilibration test developed by Andra (PAC) to follow the gaseous phase behaviour in contact with the rock formation through a borehole drilled and maintained in anaerobic conditions, and initially filled with pure argon. These in situ sensors allow, on line quantitative analysis of gases released by the rock formation at low bulk pressure (<1.3 bar). Quantitative models were developed to transform peak intensities in partial pressures of gas. They give mean absolute relative errors about 1.66 % for pCO2 (mbar.m) and 1.37 % for pCH4 (mbar.m). Three years of IR monitoring of one borehole on the site of Mt Terri and two boreholes on the site of Bure (facies C2b1 and C2d) have been led. CH4 transfer curves were modelled by diffusion-advection. CH4 concentration in porewater from non-perturbed rock formation is estimated from all the experiments: concentrations between 3.06 and 14.23 mg.L-1 was obtained for Opalinus Clay, between 0.36 and 1.28 mg.L-1 for C2d facies and between 0.56 and 1.55 mg.L-1 for C2b1 facies in Callovo-Oxfordian marls of Bure. Gas/rock/water balance governs pCO2 after drilling, whereas diffusion/advection laws explain CO2 long-term profiles. An intra-formational origin of the organic gases can be proposed
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Christelle Cailteau. Métrologie des pressions partielles de gaz (CO2 et CH4) à l'équilibre avec les eaux de formation des marnes de Bure (Meuse - Hte Marne, France) et Mont Terri (St Ursanne, Suisse) : interprétation des mécanismes de transfert de gaz après forage. Sciences de la Terre. Institut National Polytechnique de Lorraine, 2008. Français. ⟨NNT : 2008INPL030N⟩. ⟨tel-01753030⟩

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