Internal multiple prediction - A new approach based on seismic interferometry and Marchenko autofocusing

G. A. Meles*, K. Löer, M. Ravasi, A. Curtis, C. Da Costa Filho

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingPublished conference contribution

Abstract

Standard seismic processing steps such as velocity analysis and reverse time migration (imaging) usually assume that all reflections are primaries: multiples represent a source of coherent noise and must be suppressed to avoid imaging artefacts. Suppressions methods are relatively ineffective for internal multiples. We show how to predict and remove internal multiples using Marchenko autofocusing and seismic interferometry. We first show how internal multiples can theoretically be reconstructed in convolutional interferometry by combining purely reflected, up- and down-going Green's functions from virtual sources in the subsurface. We then generate the relevant up- and down-going wavefields at virtual sources along discrete subsurface boundaries using autofocusing. Then, we convolve purely scattered components of up- and down-going Green's functions to reconstruct only the internal multiple field which is adaptively subtracted from the measured data. Crucially, this is all possible without detailed modelled information about the Earth's subsurface. The method only requires surface reflection data and estimates of direct (non-reflected) arrivals between subsurface sources and the acquisition surface. The method is demonstrated on a stratified synclinal model and is particularly robust against errors in the velocity model used.

Original languageEnglish
Title of host publication77th EAGE Conference and Exhibition 2015
Subtitle of host publicationEarth Science for Energy and Environment
PublisherEuropean Association of Geoscientists and Engineers, EAGE
Pages4242-4246
Number of pages5
Volume2015
ISBN (Electronic)9781510806627
DOIs
Publication statusPublished - 1 Jan 2015
Event77th EAGE Conference and Exhibition 2015: Earth Science for Energy and Environment: Earth Science for Energy and Environment - Spain, Madrid, Spain
Duration: 1 Jun 20154 Jun 2015

Publication series

Name77th EAGE Conference and Exhibition 2015: Earth Science for Energy and Environment

Conference

Conference77th EAGE Conference and Exhibition 2015: Earth Science for Energy and Environment
Country/TerritorySpain
CityMadrid
Period1/06/154/06/15

Keywords

  • Earth sciences
  • inferometry
  • reverse time migrations
  • scattered component
  • seismic inferometries
  • seismic processing
  • seismic source
  • surface reflections
  • velocity analysis
  • virtual sources
  • Seismology

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