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A Pore-Scale Phase Field Model for CO2-Fluid-Basalt Interactions
Wenchao Dou1, Changxi Geng2, Mian Lin1,3
1Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China.
ACS Omega
|July 8, 2024
Summary
Basalt
Area of Science:
- Geochemistry
- Geology
- Materials Science
Background:
- Basalt formations are promising for geological carbon dioxide (CO2) storage.
- Understanding CO2-fluid-basalt interactions is vital for safe CO2 sequestration.
- Pore structure evolution impacts storage capacity and integrity.
Purpose of the Study:
- To model CO2-fluid-basalt interactions at the pore scale.
- To investigate the impact of these interactions on basalt's pore structure.
- To assess the influence of temperature and pressure on reaction rates for site selection.
Main Methods:
- A pore-scale phase field model was developed.
- The model simulates CO2-fluid-basalt reactions using real 3D rock images.
- Simulations analyzed mineral dissolution, precipitation, and porosity changes over 120 days.
Main Results:
- Secondary mineral precipitation (3.75%) exceeded mineral dissolution (2.01%).
- Porosity decreased by 1.74%, significantly reducing pore connectivity.
- Higher temperatures and pressures accelerated reaction rates, with temperature having a greater effect.
Conclusions:
- CO2 sequestration in basalt leads to reduced porosity and altered pore structure.
- High geothermal gradients are favorable for accelerating CO2-basalt reactions.
- The model provides insights for optimizing CO2 geological storage site selection.
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