Time-lapse monitoring of shallow subsurface in the Aquistore CO2 storage site from surfacewave analysis using a continuous and controlled seismic source

T. Ikeda, T. Tsuji, M. Takanashi, I. Kurosawa, M. Nakatsukasa, K. Worth, D. White, B. Roberts

    Research output: Contribution to journalConference articlepeer-review

    2 Citations (Scopus)


    We performed time-lapse surface-wave analysis to monitor the shallow subsurface at the Aquistore CO2 storage site, managed by the Petroleum Technology Research Centre, Canada. A continuous and controlled seismic source system called the Accurately Controlled Routinely Operated Signal System (ACROSS) is used to enhance the temporal resolution and source repeatability in the monitoring. We extracted hourly-variation of surface-wave phase velocities from continuous seismic data with 4 hour stacking. As a result, we could monitor phase velocities within 1 % accuracy during 1-9 days in the frequency range of 4.5-6 Hz. We identified 2-5 % seasonal variation of phase velocities. The high phase velocities observed in winter can be explained by the degree of freezing of partially saturated rock. Our time-lapse results contributed to improving the accuracy of monitoring deep reflections from the CO2 injection reservoir by correcting seasonal variations of nearsurface velocity. The high temporal resolution and accuracy of our monitoring results have the potential to identify sudden changes such as CO2 leakage from CO2 storage sites.

    Original languageEnglish
    Pages (from-to)5479-5484
    Number of pages6
    JournalSEG Technical Program Expanded Abstracts
    Publication statusPublished - 2016
    EventSEG International Exposition and 86th Annual Meeting, SEG 2016 - Dallas, United States
    Duration: Oct 16 2011Oct 21 2011

    All Science Journal Classification (ASJC) codes

    • Geotechnical Engineering and Engineering Geology
    • Geophysics

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