1887

Abstract

Summary

Coming Stage 3 of the CO2CRC Otway project will focus on well-based CO monitoring techniques. Although time-lapse active source seismic is probably the most reliable geophysical method for monitoring of the injected CO it has some potential disadvantages: cost and invasiveness. Use of Distributed Acoustic Sensing (DAS) for permanent monitoring and utilization of the non-primary wavefield, such as free-surface multiples, can help to alleviate these issues. Permanently installed boreholes DAS receiver arrays can provide a better optimisation of active source effort, meanwhile, interferometric imaging of VSP multiples increases the illumination of the subsurface. We performed a feasibility test of interferometric imaging on the Otway synthetic walkaway VSP dataset and this test demonstrated that the proposed approach is viable for use on DAS data. Subsequently, we performed a test on the field walkaway VSP-DAS data. Both tests have shown that utilization of non-primary wavefield can significantly increase the efficiency of walkaway VSP providing more detailed subsurface image. Experiment on the field data has proved that DAS can be sensitive enough to deal with the secondary wavefield. Finally, the combination of interferometric and standard imaging for walkaway VSP could provide a subsurface image comparable to surface seismic.

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/content/papers/10.3997/2214-4609.201900694
2019-06-03
2020-04-01
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References

  1. Claerbout, J. F.
    [1968] Synthesis of a Layered Medium from its Acoustic Transmission Response: Geophysics, 33, 264–269.
    [Google Scholar]
  2. Cook, P.
    [2014] Geologically Storing Carbon: Learning from the Otway Project Experience.: CSIRO Publishing.
    [Google Scholar]
  3. Correa, J., Egorov, A., Tertyshnikov, K., Bona, A., Pevzner, R., Dean, T., Freifeld, B. and Marshall, S.
    [2017] Analysis of signal to noise and directivity characteristics of DAS VSP at near and far offsets — A CO2CRC Otway Project data example: The Leading Edge, 36, 994a1–994a7.
    [Google Scholar]
  4. Glubokovskikh, S., Pevzner, R., Dance, T., Caspari, E., Popik, D., Shulakova, V. and Gurevich, B.
    [2016] Seismic monitoring of CO2 geosequestration: CO2CRC Otway case study using full 4D FDTD approach: International Journal of Greenhouse Gas Control, 49, 201–216.
    [Google Scholar]
  5. Rickett, J. and Claerbout, J.F.
    [1996] Passive seismic imaging applied to synthetic data: SEP-Report, 92, 83–90.
    [Google Scholar]
  6. Schuster, G. T.
    [2009] Seismic Interferometry: Cambridge University Press.
    [Google Scholar]
  7. Schuster, G. T., Yu, J., Sheng, J. and Rickett, J.
    [2004] Interferometric/daylight seismic imaging: Geophysical Journal International, 157, 838–852.
    [Google Scholar]
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