Mineral precipitation-induced porosity reduction and its effect on transport parameters in diffusion-controlled porous media

Aurélie Chagneau 1, 2, 3 Francis Claret 2 Frieder Enzmann 4 Michael Kersten 4 Stephanie Heck 1 Benoît Madé 3 Thorsten Schäfer 1, 4, 3
1 KIT - Karlsruhe Institute of Technology
2 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)
3 ANDRA - Agence Nationale pour la Gestion des Déchets Radioactifs
4 Johannes Gutenberg Universitat
Abstract : In geochemically perturbed systems where porewater and mineral assemblages are unequilibrated the processes of mineral precipitation and dissolution may change important transport properties such as porosity and pore diffusion coefficients. These reactions might alter the sealing capabilities of the rock by complete pore- scale precipitation (cementation) of the system or by opening new migration pathways through mineral dissolution. In actual 1D continuum reactive transport codes the coupling of transport and porosity is generally accomplished through the empirical Archie’s law. There is very little reported data on systems with changing porosity under well controlled conditions to constrain model input parameters. In this study celestite (SrSO4 ) was precipitated in the pore space of a compacted sand column under diffusion controlled conditions and the effect on the fluid migration prop - erties was investigated by means of three complementary experimental approaches: (1) tritiated water (HTO) tracer through diffusion, (2) computed micro-tomography (μ-CT ) imaging and (3) post-mortem analysis of the precipitate (selective dissolution, SEM/EDX).
Keywords : Mineral precipitation Reactive transport Porous media Through diffusion CT Archie’s law Model
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Article dans une revue
Geochemical Transactions, Chemistry Central, 2015, 16 (1), 16 p. 〈10.1186/s12932-015-0027-z〉
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Aurélie Chagneau, Francis Claret, Frieder Enzmann, Michael Kersten, Stephanie Heck, et al.. Mineral precipitation-induced porosity reduction and its effect on transport parameters in diffusion-controlled porous media. Geochemical Transactions, Chemistry Central, 2015, 16 (1), 16 p. 〈10.1186/s12932-015-0027-z〉. 〈hal-01399066〉

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