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Utilisation des méthodes de polarisation spontanée et polarisation provoquée pour la détection de CO₂ en milieu poreux carbonaté

Abstract : Minimally intrusive geophysical methods are required to characterize both the vadose zone of the Earth, hydrocarbon reservoirs and CO₂ sequestration. We investigate the impact of gaseous CO₂ on both electrical conductivity and electrokinetic properties of limestones under saturated and unsaturated conditions, using the spectral induced polarization and the self-potential methods. These data are contrasted with measurements performed on a Fontainebleau sandstone and data from the literature. That said, the dependence of a key parameter, the streaming coupling coefficient, with the saturation remains highly debated. Using the self-potential method, we explore the relationship between the streaming potential coupling coefficient, the capillary pressure curves and the permeability in carbonate rocks characterized by distinct textures. A new core flooding system is used to measure simultaneously both the relative permeability, the resistivity index and the streaming potential coupling coefficient in steady-state two-phase flow conditions as a function of the saturation with CO₂ or N₂. The results are compared with a recently developed theoretical model, which can accommodate either the Brooks and Corey or the van Genuchten models for the capillary pressure curves. Saturation was achieved with monovalent and divalent brines with ionic strength ranging from 1x10⁻³ Mol L⁻¹ to 1x10⁰ Mol L⁻¹. The magnitude of the coupling coefficient increases with decreasing ionic strength similarly to the trend observed for sandstones. The zeta potential has been calculated at full saturation using a modified version of the Helmholtz-Smoluchowski equation that accounts for surface electrical conductivity. Under atmospheric conditions, the magnitude of the zeta potential is decreasing with the increase of the ionic strength. We also investigate the effects of a CO₂ release and the calcite dissolution on the magnitude of the zeta potential. Finally, we use the spectral induced polarization method to determine the pore water conductivity effects on the complex electrical conductivity, the normalized chargeability and the main relaxation time during drainage in a clay free limestone. We also show evidences that these parameters could be considered as polarization parameters of the electrical double layer in the pore water conductivity range 10⁻³ - 10⁰ S m⁻¹.
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https://tel.archives-ouvertes.fr/tel-02117492
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Submitted on : Thursday, May 2, 2019 - 1:25:07 PM
Last modification on : Thursday, March 5, 2020 - 4:36:05 PM
Long-term archiving on: : Monday, September 30, 2019 - 7:53:51 PM

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  • HAL Id : tel-02117492, version 1

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Aurélien Cherubini. Utilisation des méthodes de polarisation spontanée et polarisation provoquée pour la détection de CO₂ en milieu poreux carbonaté. Sciences de la Terre. Université Michel de Montaigne - Bordeaux III, 2019. Français. ⟨NNT : 2019BOR30005⟩. ⟨tel-02117492⟩

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