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Proceedings Paper

Amplitude-preserving migration by weighted diffraction stacks
Author(s): Joerg Schleicher; Eduardo Filpo Ferreira da Silva; Christian Hanitzsch; Martin Tygel; Peter Hubral
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Paper Abstract

An amplitude-preserving migration aims at imaging compressional primary (zero- or) nonzero- offset reflections into 3D time or depth-migrated reflections so that the migrated wavefield amplitudes are a measure of angle-dependent reflection coefficients. The principal issue in this attempt is the removal of the geometrical-spreading factor of the primary reflections. Using a 3D Kirchhoff-type prestack migration approach, also often called a diffraction-stack migration, where the primary reflections of the wavefields to be imaged are a priori described by the zero-order ray approximation, the aim of removing the geometrical-spreading loss is achieved by weighting the data before stacking them. Different weight functions can be applied that are independent of the unknown reflector. The true-amplitude weight function directly removes the spreading loss during migration. It also correctly accounts for the recovery of the source pulse in the migrated image irrespective of the employed source- receiver configurations and the caustics occurring in the wavefield.

Paper Details

Date Published: 1 December 1993
PDF: 12 pages
Proc. SPIE 2033, Mathematical Methods in Geophysical Imaging, (1 December 1993); doi: 10.1117/12.164830
Show Author Affiliations
Joerg Schleicher, Univ. Karlsruhe (Germany)
Eduardo Filpo Ferreira da Silva, Petrobras/Serec/Censud (Brazil)
Christian Hanitzsch, Univ. Karlsruhe (Germany)
Martin Tygel, Univ. Estadual de Campinas (Brazil)
Peter Hubral, Univ. Karlsruhe (Germany)

Published in SPIE Proceedings Vol. 2033:
Mathematical Methods in Geophysical Imaging
Sergio E. Zarantonello, Editor(s)

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