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    Multifocusing imaging over an irregular topography

    19775_downloaded_stream_293.pdf (353.5Kb)
    Access Status
    Open access
    Authors
    Gurevich, Boris
    Keydar, S.
    Landa, E.
    Date
    2002
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Gurevich, Boris and Keydar, Shemer and Landa, Evgeny. 2002. Multifocusing imaging over an irregular topography. Geophysics 67 (2): 639-643.
    Source Title
    Geophysics
    DOI
    10.1190/1.1468625
    Additional URLs
    http://seg.org
    Faculty
    Department of Exploration Geophysics
    Division of Resources and Environment
    Remarks

    Published by the Society of Exploration Geophysicists.

    2002 Society of Exploration Geophysicists.

    Multifocusing imaging over an irregular topography

    Geophysics, Volume 67, Issue 2, pp. 639-643 (March-April 2002)

    Boris Gurevich,Shemer Keydar, and Evgeny Landa

    URI
    http://hdl.handle.net/20.500.11937/47677
    Collection
    • Curtin Research Publications
    Abstract

    If seismic data are acquired over an irregular topography, standard elevation statics methods may be inaccurate because the assumption of vertical raypaths will no longer be valid. An effective solution to the problem of irregular topography can be found through the use of the multifocusing method, in which large supergathers of seismic traces are stacked, each of which can span many common midpoint (CMP) gathers. This can be done by extending the multifocusing moveout formula to explicitly account for nonzero elevations of the source and receiver, as well as their horizontal coordinates.Implementation of this formula into the multifocusing algorithm is straightforward because estimating the necessary raypath information (i.e., emergence angles) is an integral part of the algorithm. The extended multifocusing moveout correction can be applied directly to the data acquired in areas of irregular topography without the need for prior elevation static corrections. Synthetic tests on such data show that the proposed technique results in a better alignment of reflection events.

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