Moderate high-pressure condition less than several tens MPa can be very useful for reproduction of deep underground environments to be utilized for waste disposal of CO
2. Recent development in the feasibility test of CO
2 sequestration has been achieved by phase-shift interference microscopy, laboratory
in-situ measurement of calcite growth rate in the high-temperature and high-pressure cell and
ex-situ measurement of calcite reacted in the crystal growth sonde diving into natural geothermal underground. These two approaches enable precise validation of safety storage of CO
2 and its life-time.
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