Preserved-amplitude angle domain migration by shot-receiver wavefield continuation

ABSTRACT We present preserved‐amplitude downward continuation migration formulas in the aperture angle domain. Our approach is based on shot‐receiver wavefield continuation. Since source and receiver points are close to the image point, a local homogeneous reference velocity can be approximated afte...

Full description

Saved in:
Bibliographic Details
Published in:Geophysical Prospecting 2011-03, Vol.59 (2), p.256-268
Main Authors: Joncour, Frédéric, Lambaré, Gilles, Svay-Lucas, Julie
Format: Article
Language:English
Subjects:
Applied geophysics
Earth Sciences
Earth, ocean, space
Environmental Sciences
Exact sciences and technology
Geophysics
Global Changes
Imaging
Internal geophysics
Inversion
Migration
Physics
Prospecting
Sciences of the Universe
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:ABSTRACT We present preserved‐amplitude downward continuation migration formulas in the aperture angle domain. Our approach is based on shot‐receiver wavefield continuation. Since source and receiver points are close to the image point, a local homogeneous reference velocity can be approximated after redatuming. We analyse this approach in the framework of linearized inversion of Kirchhoff and Born approximations. From our analysis, preserved‐amplitude Kirchhoff and Born inverse formulas can be derived for the 2D case. They involve slant stacks of filtered subsurface offset domain common image gathers followed by the application of the appropriate weighting factors. For the numerical implementation of these formulas, we develop an algorithm based on the true amplitude version of the one‐way paraxial approximation. Finally, we demonstrate the relevance of our approach with a set of applications on synthetic datasets and compare our results with those obtained on the Marmousi model by multi‐arrival ray‐based preserved‐amplitude migration. While results are similar, we observe that our results are less affected by artefacts.
ISSN:0016-8025
1365-2478
DOI:10.1111/j.1365-2478.2010.00921.x