Abstract
The relationship between flow properties and chemical reactions is the key to modeling subsurface reactive transport. This study develops closed-form equations to describe the effects of mineral precipitation and dissolution on multi-phase flow properties (capillary pressure and relative permeabilities) of porous media. The model accounts for the fact that precipitation/dissolution only takes place in the water-filled part of pore space. The capillary tube concept was used to connect pore-scale changes to macroscopic hydraulic properties. Precipitation/dissolution induces changes in the pore radii of water-filled pores and consequently in the pore size distribution. The updated pore size distribution is converted back to a new capillary pressure–water saturation relation from which the new relative permeabilities are calculated. Pore network modeling is conducted on a Berea sandstone to validate the new continuum-scale relations. The pore network modeling results are satisfactorily predicted by the new closed-form equations.
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Abbreviations
- \({\bar{S}}\) :
-
Effective water saturation
- \(\beta \) :
-
Ratio of pore volume after reactions to before reactions
- \(\phi \) :
-
Porosity after reactions
- \(\phi _0\) :
-
Initial porosity
- \(\tau \) :
-
Tortuosity
- h :
-
Capillary pressure head
- K :
-
Permeability after reactions
- \(K_0\) :
-
Initial permeability
- \(K_{\mathrm{g}0}\) :
-
Initial gas permeability
- \(k_{\mathrm{g}0}\) :
-
Initial gas relative permeability
- \(K_{\mathrm{g}}\) :
-
Gas permeability after reactions
- \(k_{\mathrm{g}}\) :
-
Gas relative permeability after reactions
- \(K_{\mathrm{w}0}\) :
-
Initial water permeability
- \(k_{\mathrm{w}0}\) :
-
Initial water relative permeability
- \(K_{\mathrm{w}}\) :
-
Water permeability after reactions
- \(k_{\mathrm{w}}\) :
-
Water relative permeability after reactions
- m :
-
Empirical parameter in the van Genuchten h–S relation
- r :
-
Radius of capillary tube
- \(r^*\) :
-
Radius after reactions
- \(r_\mathrm{p}\) :
-
Maximum radius up to which pores are water-filled
- S :
-
Water saturation
- \(S_\mathrm{p}\) :
-
Water saturation when mineral reaction occurs
- \(S_\mathrm{r}\) :
-
Residual water saturation
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Zhang, S., Liu, HH., van Dijke, M.I.J. et al. Constitutive Relations for Reactive Transport Modeling: Effects of Chemical Reactions on Multi-phase Flow Properties. Transp Porous Med 114, 795–814 (2016). https://doi.org/10.1007/s11242-016-0744-5
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DOI: https://doi.org/10.1007/s11242-016-0744-5