During CO2 injection, multi-physical processes occur, affecting the mechanical stresses, pore pressures, temperature, and chemistry of the participating subsurface rocks and pore fluids. These processes are coupled, meaning that changes in each aspect do impact the others mutually. Thus, the interdependent factors need to be understood as a combined system, while it should also incorporate the time-dependent response, as CO2 is projected to be stored for thousands of years. Experimental techniques are introduced to characterize the poroviscoelastic and hydraulic behavior of reservoir rock with CO2 treatment tests conducted under high-pressure conditions. The hydro-mechanical-chemical constitutive model is adopted to address the coupled response of subsurface rock, with additional studies to investigate the impact of the duration of CO2 injection. The experimental techniques developed in this study are utilized for reporting the poromechanical and hydraulic properties of various sedimentary rocks.
Publications
- Kim, H., Kim, K., Makhnenko, R. Y. (2025). Hydro‐mechanical‐chemical behavior of sedimentary rock during CO2 injection. Journal of Geophysical Research: Solid Earth, 130(12), e2025JB032279.
- Kim, K., Makhnenko, R. Y. (2022). Short-and long-term responses of reservoir rock induced by CO2 injection. Rock Mechanics and Rock Engineering, 55(11), 6605-6625.
- Kim, K., Makhnenko, R. Y. (2021). Changes in rock matrix compressibility during deep CO2 storage. Greenhouse Gases: Science and Technology, 11(5), 954-973.
- Tarokh, A., Makhnenko, R. Y., Kim, K., Zhu, X., Popovics, J. S., Segvic, B., Sweet, D. E. (2020). Influence of CO2 injection on the poromechanical response of Berea sandstone. International Journal of Greenhouse Gas Control, 95, 102959.
- Kim, K., Vilarrasa, V., Makhnenko, R. Y. (2018). CO2 injection effect on geomechanical and flow properties of calcite-rich reservoirs. Fluids, 3(3), 66.