Marchenko scheme based internal multiple reflection elimination in acoustic wavefield

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12 Citations (Scopus)

Abstract

Marchenko imaging is a methodology to image the subsurface with two important properties: (1)accurate amplitude and (2)free from free-surface and internal multiple artefacts. It requires an estimate of the first arrival of the focusing function which is commonly obtained from a macro velocity model. Inspired by this limitation, a projected Marchenko scheme has been introduced from which an internal multiple reflection elimination scheme has been derived. This internal multiple reflection elimination scheme requires an estimate of the two-way travel time surface of a selected horizon in the subsurface instead of a macro model. In order to make it totally model free we have rewritten the scheme by replacing the estimate of the two-way travel time surface by a fixed truncation for all traces. The output of the current scheme contains primary reflections without contamination from internal multiple reflections. We apply this scheme to a 2D numerical example to illustrate the procedure of this method and show how the internal multiple reflection eliminated data set can be retrieved and the migration image is improved.

Original languageEnglish
Pages (from-to)429-433
Number of pages5
JournalJournal of Applied Geophysics
Volume159
DOIs
Publication statusPublished - 1 Dec 2018

Keywords

  • Artefact-free image
  • Internal multiple reflections
  • Marchenko imaging

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