4D Neutron Imaging of Solute Transport and Fluid Flow in Sandstone Before and After Mineral Precipitation - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue (Article De Synthèse) Water Resources Research Année : 2024

4D Neutron Imaging of Solute Transport and Fluid Flow in Sandstone Before and After Mineral Precipitation

Paiman Shafabakhsh
Connectez-vous pour contacter l'auteur
Anne Pluymakers
Tanguy Le Borgne
Yi Hu
  • Fonction : Auteur
Anders Kaestner

Résumé

In many geological systems, the porosity of rock or soil may evolve during mineral precipitation, a process that controls fluid transport properties. Here, we investigate the use of 4D neutron imaging to image flow and transport in Bentheim sandstone core samples before and after in‐situ calcium carbonate precipitation. First, we demonstrate the applicability of neutron imaging to quantify the solute dispersion along the interface between heavy water and a cadmium aqueous solution. Then, we monitor the flow of heavy water within two Bentheim sandstone core samples before and after a step of in‐situ mineral precipitation. The precipitation of calcium carbonate is induced by reactive mixing of two solutions containing CaCl 2 and Na 2 CO 3 , either by injecting these two fluids one after each other (sequential experiment) or by injecting them in parallel (co‐flow experiment). We use the contrast in neutron attenuation from time‐resolved tomograms to derive three‐dimensional fluid velocity field by using an inversion technique based on the advection‐dispersion equation. Results show mineral precipitation induces a wider distribution of local flow velocities and leads to alterations in the main flow pathways. The flow distribution appears to be independent of the initial distribution in the sequential experiment, while in the co‐flow experiment, we observed that higher initial local fluid velocities tended to increase slightly following precipitation. The outcome of this study contributes to progressing the knowledge in the domain of reactive solute and contaminant transport in the subsurface using the promising technique of neutron imaging.

Domaines

Hydrologie
Fichier principal
Vignette du fichier
Water Resources Research - 2024 - Shafabakhsh - 4D Neutron Imaging of Solute Transport and Fluid Flow in Sandstone Before.pdf (2.48 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Licence : CC BY - Paternité

Dates et versions

insu-04506466 , version 1 (15-03-2024)

Licence

Paternité

Identifiants

Citer

Paiman Shafabakhsh, Benoît Cordonnier, Anne Pluymakers, Tanguy Le Borgne, Joachim Mathiesen, et al.. 4D Neutron Imaging of Solute Transport and Fluid Flow in Sandstone Before and After Mineral Precipitation. Water Resources Research, 2024, 60 (3), pp.e2023WR036293. ⟨10.1029/2023wr036293⟩. ⟨insu-04506466⟩
25 Consultations
4 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More