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Modelling the porewater chemistry of the Callovian-Oxfordian formation at a regional scale

Abstract : In ANDRA's studies to characterize the Callovian-Oxfordian formation, porewater chemistry is a key topic. Indeed, chemistry determines the durability of the repository materials (bentonite, concrete, metals, nuclear glass) and the speciation (and thus the mobility) of radionuclides. The method developed in the frame of the THERMOAR project enables the acquisition of a complete set of data from core samples to model the porewater chemistry. The method requires a detailed mineralogical study, a model of free-water/bound-water distribution, leaching experiments, adsorbed ion measurements, ion-exchange constant acquisition, and CO2 partial-pressure measurements. These experiments and measurements were done on samples from the site of the Meuse/Haute-Marne laboratory and from ANDRA's regional boreholes. The regional stability of a great number of parameters can be observed, except for a decrease of the Na and Cl concentration following a NE-SW axis passing through the laboratory. The water/rock equilibrium model makes it possible to calculate the chemical composition of interstitial waters of the formation.
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https://hal-brgm.archives-ouvertes.fr/hal-00664798
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Soumis le : mardi 31 janvier 2012 - 14:53:19
Dernière modification le : mercredi 8 juillet 2020 - 17:16:04
Archivage à long terme le : : mardi 1 mai 2012 - 02:32:41

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Eric C. Gaucher, Philippe Blanc, Frédérique Bardot, Gilles Braibant, Stéphane Buschaert, et al.. Modelling the porewater chemistry of the Callovian-Oxfordian formation at a regional scale. Comptes Rendus Géoscience, Elsevier Masson, 2006, 338, pp.917-930. ⟨10.1016/j.crte.2006.06.002⟩. ⟨hal-00664798⟩

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