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    Quantifying Time-lapse Seismic Signal Detection for the Otway Project Using Prestack Migration

    Access Status
    Fulltext not available
    Authors
    Alajmi, M.
    Bona, Andrej
    Pevzner, R.
    Date
    2015
    Type
    Conference Paper
    
    Metadata
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    Citation
    Alajmi, M. and Bona, A. and Pevzner, R. 2015. Quantifying Time-lapse Seismic Signal Detection for the Otway Project Using Prestack Migration, in Proceedings of the 77th EAGE Conference & Exhibition: Getting the most out of 4D - from reservoir to surface, Jun 1-4 2015, workshop 2. Madrid: IFEMA.
    Source Title
    77th EAGE Conference and Exhibition-Workshops
    DOI
    10.3997/2214-4609.201413466
    School
    Department of Exploration Geophysics
    URI
    http://hdl.handle.net/20.500.11937/15895
    Collection
    • Curtin Research Publications
    Abstract

    During Stage 2 of the Otway CCS Australian project it is planned to inject a small, up to 15,000 tonnes of gas, into a saline aquifer located at depth of 1500 m. In CO2 sequestration, the ability to detect CO2 plumes is one of the main purposes of using time-lapse seismic imaging. The detectability of CO2 in seismic time-lapse surveys relies on two main factors: a sufficiently strong signal and sufficiently small noise. Therefore, to model time-lapse seismic records, we need to model not only the seismic response of the geology and the plume but also the time-lapse noise. Because plume detection is determined by the S/N, the ability to model realistic time-lapse noise is crucial in any feasibility study. In this work, we propose a more realistic approach by adding band-limited random noise to the pre-stack data (shot gathers) to match the S/N of field data. Using these noisy gathers we then compare the detectability of CO2 plume by using pre- and post-stack Kirchhoff migrations.

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