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Monitoring géochimique de la géosphère et l'atmosphère : application au stockage géologique du CO2

Abstract : This study is based on the problematic of gas exchanges at the interface between the geosphere, biosphere, hydrosphere and atmosphere through the geochemical monitoring of gas applied to CO2 geological storage sites. Concerning the "Metrological" aspect, we developed and implemented an in situ continuous geochemical monitoring station, based on coupling FTIR/ Raman spectrometry for measuring soil gas (O2, N2, CO2, CH4 and H2O) close to the injection wells of Rousse 1 (CCS Total pilot, Lacq-Rousse, France). We also developed protocols to identify and quantify CO2, CH4, SO2, H2S in the atmosphere (plume) by passive remote sensing FTIR. On the "Monitoring" and "Modelling" aspects, the continuous recording of soil CO2 concentration during more than 7 seasonal cycles indicate that CO2 concentration in the soil was anti-correlated with changes in piezometric level of the groundwater. This correlation was used to model the limits of natural variability of CO2 content in the soil, which is a key to CCS sites monitoring. The main fluctuations in soil CO2 content was assigned to a dissolution/release process of CO2 by the perched water table, acting as a CO2 pump. The CO2 concentration at the near surface (+ 1 m) would be governed by changes of the soil CO2 content. FITR remote sensing measurement of atmospheric gases allowed for the first time to perform an experimental 3D simulation of CO2 layers on the injection site. This type of experimental simulation is a first step for the monitoring of gases in the atmosphere
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Submitted on : Thursday, March 29, 2018 - 12:16:44 PM
Last modification on : Wednesday, March 24, 2021 - 10:10:02 AM
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  • HAL Id : tel-01749455, version 1



Noémie Taquet. Monitoring géochimique de la géosphère et l'atmosphère : application au stockage géologique du CO2. Sciences de la Terre. Université de Lorraine, 2012. Français. ⟨NNT : 2012LORR0252⟩. ⟨tel-01749455⟩



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