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    Distributed acoustic sensing/surface orbital vibrator: Rotary seismic sources with fiber-optic sensing facilitates autonomous permanent reservoir monitoring

    Access Status
    Fulltext not available
    Authors
    Correa, Julia
    Isaenkov, Roman
    Yavuz, Sinem
    Yurikov, Alexey
    Tertyshnikov, Konstantin
    Wood, Todd
    Freifeld, Barry M
    Pevzner, Roman
    Date
    2021
    Type
    Journal Article
    
    Metadata
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    Citation
    Correa, J. and Isaenkov, R. and Yavuz, S. and Yurikov, A. and Tertyshnikov, K. and Wood, T. and Freifeld, B.M. et al. 2021. Distributed acoustic sensing/surface orbital vibrator: Rotary seismic sources with fiber-optic sensing facilitates autonomous permanent reservoir monitoring. GEOPHYSICS. 86 (6): pp. P61-P68.
    Source Title
    GEOPHYSICS
    DOI
    10.1190/GEO2020.0612.1
    ISSN
    0016-8033
    Faculty
    Faculty of Science and Engineering
    School
    School of Earth and Planetary Sciences (EPS)
    WASM: Minerals, Energy and Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/97510
    Collection
    • Curtin Research Publications
    Abstract

    With new developments of fiber-optic sensing and rotary sources, continuous active seismic monitoring for onshore applications has now the opportunity to be fully realized and applied to enhance subsurface resource extraction and use. To date, conventional seismic monitoring deployments have primarily consisted of receiver arrays, either fixed or not, with periodic data acquisition campaigns using temporarily deployed sources, resulting in time-lapse data with poor temporal resolution. Only a few niche efforts have demonstrated continuous acquisition using fixed source-receiver networks. We have evaluated the initial results of a network of fixed rotary seismic sources, referred to as surface orbital vibrators (SOVs), coupled with a permanent distributed acoustic sensing (DAS) network at the CO2CRC Otway Field Site. Although rotary seismic sources are not new, our development of the SOV focused on simplifying the cost and complexity of the source hardware while delivering broad frequency spectrum of the source signal. The upgraded hardware is aligned with a robust methodology for autonomous operation and data processing. At the Otway Site, we deployed SOVs at nine locations, monitoring seismic response in seven DAS instrumented wells. Baseline operation of the DAS/SOV sensor array and source system demonstrates its capability with near offsets attaining a signal-to-noise ratio approaching 100 dB with a normalized root mean square of 10%. Furthermore, analyses of traveltime repeatability indicate that the DAS/SOV system can deliver time resolution of ±500 μs.

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