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URN: urn:nbn:de:swb:90-520597

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

Chagneau, A.; Claret, F.; Enzmann, F.; Kersten, M.; Heck, S.; Madé, B.; Schäfer, T.

Abstract:
Background: 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 (SrSO<inf>4</inf>) was precipitated in the pore space of a compacted sand column under diffusion controlled conditions and the effect on the fluid migration properties 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 pr ... mehr


Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator ISSN: 1467-4866
KITopen ID: 1000052059
Erschienen in Geochemical Transactions
Band 16
Heft 1
Seiten 13
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
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