Geophysics and Geophysical Exploration (지구물리와물리탐사)

Korean Society of Earth and Exploration Geophysicists (한국지구물리·물리탐사학회)
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Monitoring and detecting $CO_2$ injected into water-saturated sandstone with joint seismic and resistivity measurements

탄성파 및 비저항 동시측정에 의한 수포화 암석시료에 주입된 $CO_2$ 모니터링 및 탐지

  • Kim, Jong-Wook (Laboratory of Environment and Resource System Engineering, Department of Urban Management, Graduate School of Engineering, Kyoto University) ;
  • Matsuoka, Toshifumi (Laboratory of Environment and Resource System Engineering, Department of Urban Management, Graduate School of Engineering, Kyoto University) ;
  • Xue, Ziqiu (Research Institute of Innovative Technology for the Earth)
  • 김종욱 (교토대학 대학원 공학연구과 도시사회공학) ;
  • 마츠오카 토시후미 (교토대학 대학원 공학연구과 도시사회공학) ;
  • 설자구 (지구환경산업기술연구기관 (RITE))
  • Received : 2010.10.14
  • Accepted : 2010.12.13
  • Published : 2011.02.28
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Abstract

As part of basic studies of monitoring carbon dioxide ($CO_2$) storage using electrical and seismic surveys, laboratory experiments have been conducted to measure resistivity and P-wave velocity changes due to the injection of $CO_2$ into water-saturated sandstone. The rock sample used is a cylinder of Berea sandstone. $CO_2$ was injected under supercritical conditions (10 MPa, $40^{\circ}C$). The experimental results show that resistivity increases monotonously throughout the injection period, while P-wave velocity and amplitude decrease drastically due to the supercritical $CO_2$ injection. A reconstructed P-wave velocity tomogram clearly images $CO_2$ migration in the sandstone sample. Both resistivity and seismic velocity are useful for monitoring $CO_2$ behaviour. P-wave velocity, however, is less sensitive than resistivity when the $CO_2$ saturation is greater than ~20%. The result indicates that the saturation estimation from resistivity can effectively complement the difficulty of $CO_2$ saturation estimations from seismic velocity variations. By combining resistivity and seismic velocity we were able to estimate $CO_2$ saturation distribution and the injected $CO_2$ behaviour in our sample.

전기 및 탄성파 탐사를 이용한 이산화탄소 지중저장의 모니터링의 기초연구로써, 수포화 암석시료에 $CO_2$주입시 비저항과 P파속도를 측정하였다. 암석시료는 Berea사암이며, $CO_2$는 초임계상태 (10 MPa, $40^{\circ}C$)로 주입하였다. 초임계 $CO_2$주입에 의해 비저항의 증가 및 P파속도와 진폭이 감소하였다. P파 속도 토모그램은 암석시료에 주입한 초임계 $CO_2$의 거동양상을 보여주었다. 비저항과 탄성파속도는 $CO_2$거동 모니터링하는데 유용하다. 그러나 P파 속도는 비저항 변화에 비해 $CO_2$포화도가 20% 이상 일때 변화를 보이지 않았다. 비저항으로부터 $CO_2$포화도 예측은 탄성파 속도로부터 $CO_2$포화도 예측의 어려움을 보완할 수 있다. 비저항과 탄성파 속도의 동시측정에 의해 암석시료에 주입한 초입계 $CO_2$ 거동 및 $CO_2$포화도 분포를 예측할 수 있다.

Keywords

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