1887
Volume 42, Issue 1
  • ISSN: 0812-3985
  • E-ISSN: 1834-7533

Abstract

As part of basic studies of monitoring carbon dioxide (CO) 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 into water-saturated sandstone. The rock sample used is a cylinder of Berea sandstone. CO was injected under supercritical conditions (10 MPa, 40°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 injection. A reconstructed P-wave velocity tomogram clearly images CO migration in the sandstone sample. Both resistivity and seismic velocity are useful for monitoring CO behaviour. P-wave velocity, however, is less sensitive than resistivity when the CO saturation is greater than ~20%. The result indicates that the saturation estimation from resistivity can effectively complement the difficulty of CO saturation estimations from seismic velocity variations. By combining resistivity and seismic velocity we were able to estimate CO saturation distribution and the injected CO behaviour in our sample.

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/content/journals/10.1071/EG11002
2011-03-01
2026-01-20
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