1887
Volume 68, Issue 2
  • E-ISSN: 1365-2478

Abstract

ABSTRACT

Reverse time migration of multiples can be used to construct subsurface structures where primaries cannot illuminate well. However, the images generated using multiples suffer from severe artefacts due to the cross‐talks created by interference among unrelated multiples. We developed a migration approach using water‐bottom‐related multiples to reduce these cross‐talk artefacts. This approach first isolates primaries from the original data and predicts water‐column primaries. The th‐order water‐column multiples can be obtained by auto‐convolving the water‐column primaries times, followed by convolving the th‐order water‐column multiples with the primaries to extract the (+1)th‐order water‐bottom‐related multiples. The approach takes the th‐order water‐column multiples as the secondary source and regards the (+1)th‐order water‐bottom‐related multiples as the receiver wavefield, followed by a cross‐correlation imaging condition. Numerical examples from synthetic and field data sets reveal that our approach can provide images with substantially fewer cross‐talk artefacts than conventional reverse time migration using multiples, as well as greatly improving shallow imaging compared with reverse time migration of primaries.

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/content/journals/10.1111/1365-2478.12851
2019-08-09
2024-03-29
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  • Article Type: Research Article
Keyword(s): Imaging; Inversion; Modelling; Seismics

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