Angle-dependent full wavefield migration based upon full waveform inversion and joint migration inversion

Yimin Sun, Young Seo Kim, Shan Qu, D.J. Verschuur, Ali Almomin, Roald van Borselen

    Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

    3 Citations (Scopus)

    Abstract

    The Santos basin in Brazil suffers from strong internal multiples that overlap with primaries from the pre-salt reservoirs. We propose an adaptive double-focusing method for the removal of these multiples to obtain a correct image of the target area. The proposed method applies a form of source-receiver Marchenko redatuming to the reflection response. The Marchenko method is used to achieve single-focusing, after which we convolve the retrieved downgoing focusing function and the upgoing Green’s function to create double-focusing. This results in a base image that contains both primaries and internal multiples, and two models that predict the strongest internal multiples. Next, adaptive subtraction in the curvelet domain is used to remove these multiples from the base image. Some multiple interactions between the target area and the overburden remain, but we gain a robust method that is capable of dealing with a sparse acquisition geometry and imperfections in the (pre-processed) data. Also, this method is straightforward to implement and can be parallelized over pairs of focal points. These properties make adaptive double-focusing particularly suitable for the application to large volumes of field data. Tests on 2D field data and 3D field data show that the proposed method correctly predicts and removes the strongest internal multiples from the overburden, resulting in a clear improvement of the geological interpretability in the target area.
    Original languageEnglish
    Title of host publicationSEG Technical Program Expanded Abstracts 2018
    Subtitle of host publication14-19 October 2018, Anaheim, United States
    EditorsD. Alumbaugh, D. Bevc
    PublisherSEG
    Pages4357-4361
    DOIs
    Publication statusPublished - 2018
    EventSEG Annual Meeting 2018 - Anaheim convention Center, Anaheim, United States
    Duration: 14 Oct 201819 Oct 2018
    Conference number: 88
    https://seg.org/Annual-Meeting-2018

    Publication series

    NameSEG Technical Program Expanded Abstracts 2018
    PublisherSEG
    ISSN (Electronic)1949-4645

    Other

    OtherSEG Annual Meeting 2018
    Abbreviated titleSEG 2018
    CountryUnited States
    CityAnaheim
    Period14/10/1819/10/18
    Internet address

    Keywords

    • imaging
    • full-waveform inversion
    • depth migration
    • internal multiples
    • inversion

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