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PP amplitude bias caused by interface scattering: are diffracted waves guilty?

By
Nathalie Favretto-Cristini
Nathalie Favretto-Cristini
Centre National de la Recherche Scientifique, Laboratoire d’lmagerie Geophysique UMR 5831, Universite de Pau et des Pays de I’Adour, BP 1155-64013 Pau Cedex, and
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Eric de Bazelaire
Eric de Bazelaire
Centre National de la Recherche Scientifique, Laboratoire d’lmagerie Geophysique UMR 5831, Universite de Pau et des Pays de I’Adour, BP 1155-64013 Pau Cedex, and
TotalFinaElf, CSTJF, Avenue Larribau, 64018 Pau Cedex, France
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Published:
January 01, 2016

Abstract

This paper is concerned with the problem of interpretation of anomalous seismic amplitudes’ induced by the amplitude-scattering phenomenon. This phenomenon occurs in the vicinity of a crack distribution at the interface between elastic layers. The purpose of this work is to obtain a better understanding of the physics of this distinctive phenomenon’ in order to interpret correctly the amplitudes of the reflected events. By analogy with studies in optics and in acoustics’ we suggest that diffraction is widely involved in the amplitude-scattering phenomenon. Analytical evaluation of the amount of energy carried by the reflected and the diffracted waves shows that neglecting diffraction in numerical models leads to local underestimation of the amplitude of waves reflected at interfaces with gas-filled crack distribution.

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Contents

Society of Exploration Geophysicists Geophysics Reprint Series

Seismic Diffraction

Kamil Klem-Musatov
Kamil Klem-Musatov
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Henning Hoeber
Henning Hoeber
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Michael Pelissier
Michael Pelissier
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Tijmen Jan Moser
Tijmen Jan Moser
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Society of Exploration Geophysicists
Volume
30
ISBN electronic:
9781560803188
Publication date:
January 01, 2016

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