Reactive transport modelling in dual porosity media

2018 ◽  
Vol 190 ◽  
pp. 436-442 ◽  
Author(s):  
Min Liu ◽  
Peyman Mostaghimi
Keyword(s):  
Reactive Transport ◽  
Dual Porosity ◽  
Reactive Transport Modelling ◽  
Transport Modelling

Reactive Transport Modelling applied to Ni laterite ore deposits in New Caledonia : Impact of discrete fractures on Ni mineralization

2021 ◽  
Author(s):  
Sylvain Favier ◽  
Yoram Teitler ◽  
Fabrice Golfier ◽  
Michel Cathelineau
Keyword(s):  
Fluid Flow ◽  
Reactive Transport ◽  
New Caledonia ◽  
Dual Porosity ◽  
Reactive Transport Modelling ◽  
Transport Modelling ◽  
Dual Porosity Model ◽  
The Impact ◽  
Porosity Model ◽  
2D Model

<p>Laterite nickel-ore formation in New Caledonia is classically assumed to be governed by supergene processes, and downward migration of waters with Ni-enrichment at the basis of the laterite profile. However, Ni-ore distribution's heterogeneity seems to have been favoured by secondary processes controlled by the combined effects of inherited tectonics, geomorphological evolution and hydrologic systems since the primary laterite formation. Fluid flow and mass transfer processes are not purely downward at low-temperature conditions, but can also be related to lateral fluid circulations, and local drainage along damaged zones in the vicinity of faults (Cathelineau et al., 2016a; 2016b; Myagkiy et al., 2019). This study aims to investigate through reactive transport modelling the impact of discrete fracture on the Ni distribution.</p><p><br>We simulate the dissolution of olivine profile where fractures are the main channels of the fluid-flow. Olivine dissolution is assumed to be kinetically controlled whereas the precipitation of secondary weathering products is considered to occur according to local equilibrium. Results from two different numerical approaches are presented and discussed. The first one is based on a 1D dual-porosity model of a vertically oriented column of serpentinized olivine using PhreeqC associated with the llnl.dat thermodynamic database. The second one is a 2D modelling of hydro-chemical processes in fractured porous media based on the coupling of PhreeqC and Comsol Multiphysics through ICP. While the 1D model aims to describe the general trend of the progression of the weathering front and the global mineral redistribution, the 2D model focuses on particular fracture geometry and hotspot moments of the dissolution process to highlight crucial transition and redistribution of the different mineral phases in relation with the spatial distribution of fractures.</p><p><br>In the 1D dual-porosity model, the fractures are modelled as advective cells connected to a diffusive cell containing the main part of olivine. Two different geochemical models are thus designed. The first one describes the fracture and the advective area's geochemical behaviour, while the second one focuses on the matrix in the diffusive area. The 2D model extends the work initiated by Myagkiy et al. (2019) on simple configurations. The fractures are modelled herein as 1D discrete surfaces interacting with a porous matrix of olivine. Different fracture configurations are studied to assess their impact on mineral redistribution.</p><p><br>Results from both modellings are then compared with observed field data from New Caledonia and previous modelling of an olivine profile without fractures (Myagkiy et al., 2017) to validate the models and highlight the differences induced by the fracture network.</p>

scholarly journals Reactive transport modelling of a high-pH infiltration test in concrete

2017 ◽  
Vol 99 ◽  
pp. 131-141 ◽  
Author(s):  
M. Carme Chaparro ◽  
Josep M. Soler ◽  
Maarten W. Saaltink ◽  
Urs K. Mäder
Keyword(s):  
Reactive Transport ◽  
Reactive Transport Modelling ◽  
Transport Modelling ◽  
High Ph ◽  
Infiltration Test

scholarly journals In situ investigations and reactive transport modelling of cement paste/argillite interactions in a saturated context and outside an excavated disturbed zone

2013 ◽  
Vol 31 ◽  
pp. 94-108 ◽  
Author(s):  
Danièle Bartier ◽  
Isabelle Techer ◽  
Alexandre Dauzères ◽  
Philippe Boulvais ◽  
Marie-Madeleine Blanc-Valleron ◽  
...  
Keyword(s):  
Cement Paste ◽  
Reactive Transport ◽  
Reactive Transport Modelling ◽  
Transport Modelling ◽  
Disturbed Zone
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