Marchenko wavefield redatuming, imaging conditions, and the effect of model errors

Conference paper (2016)

Authors

Sjoerd de Ridder The University of Edinburgh

J.R. van der Neut Applied Geophysics and Petrophysics -

A Curtis The University of Edinburgh

C.P.A. Wapenaar Applied Geophysics and Petrophysics -

Research Group

Applied Geophysics and Petrophysics () (TU Delft)

DOI: https://doi.org/10.1190/segam2016-13777555.1

Imaging Autofocusing Inversion Velocity Internal multiples

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Published Date

2016

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Geoscience and Engineering

Research Group

Applied Geophysics and Petrophysics

Abstract

Recently, a novel method to redatum the wavefield in the sub-surface from a reflection response measured at the surface has gained interest for imaging primaries in the presence of strong internal multiples. A prerequisite for the algorithm is an accurate and correct estimate of the direct-wave Green's function. However, usually we use an estimate for the direct-wave Green's function computed in a background velocity medium. Here, we investigate the effect of amplitude and phase errors in that estimate. We formulate two novel imaging conditions based on double-focusing the measured reflection response inside the subsurface. These yield information on the amplitude error in the estimate for the direct-wave Green's function which we can then correct, but the phase error remains elusive.

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