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    The CO2CRC otway project deployment of a distributed acoustic sensing network coupled with permanent rotary sources

    Access Status
    Fulltext not available
    Authors
    Freifeld, B.
    Pevzner, Roman
    Dou, S.
    Correa, J.
    Daley, T.
    Robertson, M.
    Tertyshnikov, Konstantin
    Wood, T.
    Ajo-Franklin, J.
    Urosevic, Milovan
    Gurevich, Boris
    Date
    2016
    Collection
    • Curtin Research Publications
    Type
    Conference Paper
    Metadata
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    Abstract

    We have deployed a novel permanent monitoring system at the Australian CO2CRC Otway Site that includes a surface and borehole distributed acoustic sensing (DAS) network with orbital vibrator (rotary) surface seismic sources. DAS is an emerging technology for performing seismic acquisition based on optical interferometric techniques, which allows for data collection with a wide spatial aperture and high temporal resolution using commercially available telecommunications fibres. DAS sensitivity currently lags behind conventional discrete geophone and hydrophone sensor technologies. Our implementation of surface rotary seismic sources is based on open-loop controlled asynchronous motors. This avoids the complexity of feedback loops for phase control, instead using deconvolution of the source function as measured by a shallow source-monitor sensor. Initial data analysis shows that the amount of energy available from long source sweeps overcomes limitations in DAS sensitivity. The combination of relatively inexpensive but powerful permanent surface sources with permanent DAS deployment in an areal array provides a new paradigm for time-lapse seismic monitoring. The methodology we describe has broad applicability for long-term reservoir surveillance, with time-lapse change sensitive to many subsurface properties.

    Citation
    Freifeld, B. and Pevzner, R. and Dou, S. and Correa, J. and Daley, T. and Robertson, M. and Tertyshnikov, K. et al. 2016. The CO2CRC otway project deployment of a distributed acoustic sensing network coupled with permanent rotary sources.
    Source Title
    78th EAGE Conference and Exhibition 2016: Efficient Use of Technology - Unlocking Potential
    URI
    http://hdl.handle.net/20.500.11937/54506
    Department
    Department of Exploration Geophysics

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