Wave modes study for acoustic VTI equations

D. I. Sabitov, Marwan Charara, Y. A. Nikonenko, A. A. Dotsenko

    Результат исследований: Глава в книге, отчете, сборнике статейМатериалы для конференциирецензирование

    2 Цитирования (Scopus)

    Аннотация

    The application of reverse-time migration (RTM) on a large scale has become affordable and has led to significant advances in seismic depth imaging in complex areas, especially for sub-salt imaging. For imaging in anisotropic media with vertically transverse isotropy (VTI), RTM is usually based on an acoustic VTI approximation of the elastic wave equation by setting the vertical shear-wave velocity to zero. However, these equations generate artificial pseudo shear-waves that spoil any seismic imaging process. By studying the wave modes associated to that equation, we identify that a second mode exists for the anelliptic case, i.e., when the Thomsen parameters ϵ is different from δ. This mode generates the spurious pseudo shear-waves. We show that as long as the simulation of the P-wave propagation is consistent with the usual marine seismic wavelengths, the spurious pseudo-shear wave is not generated or very weak compared to the P-wave mode. We illustrate this fact, for the case of a homogeneous medium modelling and for the more realistic case of a 2D Salt body modelling.

    Язык оригиналаАнглийский
    Название основной публикацииGeomodel 2017 - 19th Science and Applied Research Conference on Oil and Gas Geological Exploration and Development
    ИздательEuropean Association of Geoscientists and Engineers, EAGE
    ISBN (электронное издание)9789462822269
    DOI
    СостояниеОпубликовано - 2017
    Событие19th Science and Applied Research Conference on Oil and Gas Geological Exploration and Development, Geomodel 2017 - Gelendzhik, Российская Федерация
    Продолжительность: 11 сент. 201714 сент. 2017

    Серия публикаций

    НазваниеGeomodel 2017 - 19th Science and Applied Research Conference on Oil and Gas Geological Exploration and Development
    Том2017-September

    Конференция

    Конференция19th Science and Applied Research Conference on Oil and Gas Geological Exploration and Development, Geomodel 2017
    Страна/TерриторияРоссийская Федерация
    ГородGelendzhik
    Период11/09/1714/09/17

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