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    Amplitude and phase response of DAS receivers

    Access Status
    Fulltext not available
    Authors
    Bona, A.
    Dean, T.
    Correa, J.
    Pevzner, R.
    Tertyshnikov, Konstantin
    Van Zaanen, L.
    Date
    2017
    Type
    Conference Paper
    
    Metadata
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    Citation
    Bona, A. and Dean, T. and Correa, J. and Pevzner, R. and Tertyshnikov, K. and Van Zaanen, L. 2017. Amplitude and phase response of DAS receivers.
    Source Title
    79th EAGE Conference and Exhibition 2017
    ISBN
    9789462822177
    School
    Department of Exploration Geophysics
    URI
    http://hdl.handle.net/20.500.11937/58799
    Collection
    • Curtin Research Publications
    Abstract

    The emergence of distributed acoustic sensing (DAS) as a method for acquiring seismic data has inevitably resulted in comparisons between DAS and geophone data. Herein we present and analyse the differences between the amplitude and phase spectra of the two types of datasets in terms of the pulse and gauge lengths. We have shown and demonstrated using both synthetic and field data examples that the effect of the lengths on phase is considerable, leading to changes of the shape of the wavelet and, possibly more importantly, the arrival time. The presented process can easily correct the phase of DAS data, and we expect this to become a standard part of DAS data processing. We have also quantified for what wavelengths the commonly used approximation of a DAS receiver directivity pattern by cosine squared is valid - the wavelengths should be at lest four times longer that the gauge length and the pulse length.

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