Otway CO2CRC project focuses on the development of effective technologies for capture, storage and monitoring of carbon dioxide (CO2) injections into the subsurface. In this study, we investigate the phenomenon of seismic attenuation at the Otway site. We consider a set of nine zero-offset VSP (ZVSP) datasets from the four wells located in the radius of 1 km from each other. The redundancy of the available data provides a unique opportunity to compare and evaluate the reliability of the attenuation estimates. We compare conventional Amplitude Decay (AD) and Centroid Frequency Shift (CFS) methods versus a recently reported 1D waveform inversion (WI) that allows one to separate the effect of layer-induced scattering on Q-estimates (Q being a measure of attenuation). We demonstrate that WI gives more robust estimates than AD and CFS. However, results of all of the methods may be distorted by the presence of non-horizontal features such as faults. The obtained Q-models for the four boreholes are broadly consistent with each other. They reveal a pronounced seismic attenuation (1/Q > 0.02) for the shaley formations. The thin CO2 plume (< 30 m) does not produce a noticeable effect on attenuation estimates.


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  1. Egorov, A., Pevzner, R., Bóna, A., Glubokovskikh, S., Puzyrev, V., Tertyshnikov, K., and Gurevich, B.
    , 2017, Time-lapse full waveform inversion of vertical seismic profile data: Workflow and application to the CO2CRC Otway project, Geophys. Res. Lett., 44, 7211–7218, doi: 10.1002/2017GL074122.
    https://doi.org/10.1002/2017GL074122 [Google Scholar]
  2. Glubokovskikh, S., Pevzner, R., Dance, T., Caspari, E., Popik, D., Shulakova, V., 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]
  3. Pirogova, A., Gurevich, B., Pevzner, R., Glubokovskikh, S.
    , 2017, Estimation of intrinsic Q in finely-layered media by wavefield inversion of VSP data – Australian North West Shelf case-study, EAGE Extended Abstracts, doi: 10.3997/2214‑4609.201700514
    https://doi.org/10.3997/2214-4609.201700514 [Google Scholar]
  4. Pevzner, R., Urosevic, M., Popik, D., Shulakova, V., Tertyshnikov, K., Caspari, E.
    , et al., 2017, 4D surface seismic tracks small supercritical CO2 injection into the subsurface: CO2CRC Otway Project, International Journal of Greenhouse Gas Control, 63, pp. 150–157.
    [Google Scholar]
  5. Quan, Y., and HarrisJ. M.
    , 1997, Seismic attenuation tomography using the frequency shift method: Geophysics, 62, 895–905, doi: 10.1190/1.1444197.
    https://doi.org/10.1190/1.1444197 [Google Scholar]
  6. Shulakova, V., Pevzner, R., Glubokovskikh, S., Popik, D., and Tertyshnikov, K.
    , 2017, Time-lapse Seismic Data Inversion for CO2 Sequestration CO2CRC Otway Project, Extended abstracts, 79th EAGE Conference and Exhibition 2017, doi: 10.3997/2214‑4609.201701319
    https://doi.org/10.3997/2214-4609.201701319 [Google Scholar]
  7. Tonn, R.
    , 1991, The determination of the seismic quality factor Q from VSP data – A comparison of different computational methods, Geophysical Prospecting, 39, no. 1, 1–27.
    [Google Scholar]

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