Modelling pH evolution in Boom Clay porewater during in situ heating

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Abstract

During an in situ thermal perturbation on a clayey rock, CO2 production by decomposition of immature, labile kerogen can take place and acidify the porewater. Calculation of pH changes during five years of heating in the CERBERUS project (a demonstration test to study the near-field effects of a high level radioactive waste canister in an argillaceous formation) is carried out, using a coupled production-diffusion model, combined with or without chemical reaction with calcite. Re-equilibration time of the water-rock system is evaluated and perspectives are given for further developments in the frame of research for disposal of heat-emitting waste in a clay formation.

Details

Original languageEnglish
Title of host publicationWater-Rock Interaction. Proceedings of the 12th International Symposium on Water-Rock Interaction, Kunming, China, 31 July - 5 August 2007.
Place of PublicationLondon, United Kingdom
Pages1-4
Publication statusPublished - Jul 2007
EventTwelfth International Symposium on Water-Rock Interaction, WRI-12 - International Association of Geochemistry, Kunming, China
Duration: 31 Jul 20075 Aug 2007

Conference

ConferenceTwelfth International Symposium on Water-Rock Interaction, WRI-12
CountryChina
CityKunming
Period2007-07-312007-08-05

Keywords

  • Boom Clay, Cerberus, CO2, decarboxylation, heat, IFP, kerogen, OM, organic matter, pCO2, temperature increase, thermal perturbation, thermal stress

ID: 168698