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Underground CO2 storage technology is one of the most effective methods to reduce atmospheric CO2. In this study, CO2 storage condition was simulated in the laboratory. Sandstone and shale specimens were saturated in 1M NaCl and were reacted at 45°C, 10 atm for 4 weeks. The physical and microstructural properties of rock specimens were measured. Variations on physical properties of shale specimens were bigger than those of sandstone specimens, such as volume, density, elastic wave velocity, Poisson’s ratio and Young’s modulus. Microstructure were analyzed using X-ray computed tomography. Total number of pores were decreased, and average volume, average area and average equivalent diameter of each pore were changed after CO2 reaction. Swelling and leakage of clay mineral caused by CO2-mineral reaction were the reason of changes. The results of this study can be applied to predict the physical and microstructural changes in underground CO2 storage condition.

Variation of the Physical-microstructural Properties of Sandstone and Shale Caused by CO2Reaction in High Pressure Condition

Variation of the Physical-microstructural Properties of Sandstone and Shale Caused by CO₂Reaction in High Pressure Condition