1887

Abstract

Summary

The next stage of CO2CRC Otway project involves exploration of the ability of various CO2 geosequestration techniques, including cross-hole seismic, to detect and monitor presence of CO2. Despite the limited spatial coverage of a cross-well survey, the acquired data could be used to improve reliability of the whole monitoring and verification program.

Prior to any field experiment we evaluate the feasibility of cross-well seismic using computer modelling. We utilize finite-difference time-domain (FDTD) method for pre- and post- injection stages.

Here we present the results of our study and validate the detectability of CO2/CH4 gas mixture on time-lapse cross-well seismic data on the direct as well as the reflected wave fields.

We demonstrate that the presence of 15,000 t of a gas plume can lead to changes in transit times of up to 1.4 ms (in cross-well setting). The computed seismic tomography detects the difference in velocities up to 80 m/s. The difference caused by gas is also detectable in the migrated time section of reflected waves.

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/content/papers/10.3997/2214-4609.201413364
2015-06-01
2020-01-27
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References

  1. Pevzner, R., Urosevic, M., Caspari, E., Galvin, R.J., Madadi, M., Dance, T., Shulakova, V., Gurevich, B., Tcheverda, V. and Cinar, Y.
    [2013] Feasibility of time-lapse seismic methodology for monitoring the injection of small quantities of CO2 into a saline formation, CO2CRC Otway Project. Energy Procedia, 37, 4336–4343.
    [Google Scholar]
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