Variation of the Physical-microstructural Properties of Sandstone and Shale Caused by CO2 Reaction in High Pressure Condition

고압 이산화탄소 반응에 의한 사암과 셰일의 물리적-미세구조적 변화

  • 박지환 (서울대학교 에너지자원신기술연구소) ;
  • 손진 (서울대학교 공과대학 에너지시스템공학부) ;
  • 박형동
  • Received : 2016.08.05
  • Accepted : 2016.08.19
  • Published : 2016.08.31


Underground $CO_2$ storage technology is one of the most effective methods to reduce atmospheric $CO_2$. In this study, $CO_2$ storage condition was simulated in the laboratory. Sandstone and shale specimens were saturated in 1M NaCl and were reacted at $45^{\circ}C$, 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 $CO_2$ reaction. Swelling and leakage of clay mineral caused by $CO_2$-mineral reaction were the reason of changes. The results of this study can be applied to predict the physical and microstructural changes in underground $CO_2$ storage condition.


CCS;underground storage;X-ray CT;laboratory experiment;pore network


Grant : CO2 해양지중저장 기술개발

Supported by : 한국해양과학기술진흥원


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