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    How rough sea affects marine seismic data and deghosting procedures

    Access Status
    Open access via publisher
    Authors
    Egorov, A.
    Glubokovskikh, Stanislav
    Bóna, A.
    Pevzner, R.
    Gurevich, B.
    Tokarev, M.
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Egorov, A. and Glubokovskikh, S. and Bóna, A. and Pevzner, R. and Gurevich, B. and Tokarev, M. 2018. How rough sea affects marine seismic data and deghosting procedures. Geophysical Prospecting. 66 (1): pp. 3-12.
    Source Title
    Geophysical Prospecting
    DOI
    10.1111/1365-2478.12535
    ISSN
    0016-8025
    School
    Department of Exploration Geophysics
    URI
    http://hdl.handle.net/20.500.11937/53999
    Collection
    • Curtin Research Publications
    Abstract

    Most seismic processing algorithms generally consider the sea surface as a flat reflector. However, acquisition of marine seismic data often takes place in weather conditions where this approximation is inaccurate. The distortion in the seismic wavelet introduced by the rough sea may influence (for example) deghosting results, as deghosting operators are typically recursive and sensitive to the changes in the seismic signal. In this paper, we study the effect of sea surface roughness on conventional (5-160 Hz) and ultra-high-resolution (200-3500 Hz) single-component towed-streamer data. To this end, we numerically simulate reflections from a rough sea surface using the Kirchhoff approximation. Our modelling demonstrates that for conventional seismic frequency band sea roughness can distort results of standard one-dimensional and two-dimensional deterministic deghosting. To mitigate this effect, we introduce regularisation and optimisation based on the minimum-energy criterion and show that this improves the processing output significantly. Analysis of ultra-high-resolution field data in conjunction with modelling shows that even relatively calm sea state (i.e., 15 cm wave height) introduces significant changes in the seismic signal for ultra-high-frequency band. These changes in amplitude and arrival time may degrade the results of deghosting. Using the field dataset, we show how the minimum-energy optimisation of deghosting parameters improves the processing result.

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