Speaker
Description
The CO2-solute dispersion dynamics in multi-scale porous media is critical for various chemical and environmental applications. The fundamental insight into CO2-solute dispersion at pore-scale is in urgent need. To address this gap, we presented a visualization method based on micromodels. We fabricated micromodels that closely match the hydraulic pore diameter distribution, permeability and connectivity with rock sample. The visualization of CO2-solute dispersion during CO2 drainage revealed that the reduced connectivity of porous media causes CO2 sub-dispersion, while high CO2 injection rates promote super-dispersion. Furthermore, three-stage CO2 dispersion process was detected in fractured porous media. Our study reveals the synergistic effects of microscope heterogeneity of porous media, as well as the injection rate and fracture-matrix crossflow on reaction, flow, and solute dispersion of CO2, with important implications on CO2 geological sequestration and subsurface contaminant transport.
| Country | China |
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