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Coherent interferometric imaging in clutter

Liliana Borcea, George Papanicolaou and Chrysoula Tsogka
Coherent interferometric imaging in clutter (in Seismic interferometry, Kees Wapenaar (editor), Deyan Draganov (editor) and Johann Robertsson (editor))
Geophysics (July 2006) 71 (4, SUPPL.): SI165-SI175

Abstract

Coherent interferometry is an array-imaging method in which we back-propagate, or migrate, crosscorrelations of the traces over appropriately chosen space-time windows rather than the traces themselves. The size of the space-time windows is critical and depends on two parameters. One is the decoherence frequency, which is proportional to the reciprocal of the delay spread in the traces produced by the clutter. The other is the decoherence length, which also depends on the clutter. As is usual, the clutter is modeled by random fluctuations in the medium properties. In isotropic clutter, the decoherence length is typically much shorter than the array aperture. In layered random media, the decoherence length along the layers can be quite long. We show that when the crosscorrelations of the traces are calculated adaptively, coherent interferometry can provide images that are statistically stable relative to small-scale clutter in the environment. This means that the images we obtain are not sensitive to the detailed form of the clutter. They only depend on its overall statistical properties. However, clutter does reduce the resolution of the images by blurring. We show how the amount of blurring can be minimized by using adaptive interferometric imaging algorithms and discuss the relation between the coherence properties of the array data and the loss in resolution caused by the blurring.


ISSN: 0016-8033
EISSN: 1942-2156
Coden: GPYSA7
Serial Title: Geophysics
Serial Volume: 71
Serial Issue: 4, SUPPL.
Title: Coherent interferometric imaging in clutter
Title: Seismic interferometry
Author(s): Borcea, LilianaPapanicolaou, GeorgeTsogka, Chrysoula
Author(s): Wapenaar, Keeseditor
Author(s): Draganov, Deyaneditor
Author(s): Robertsson, Johanneditor
Affiliation: Rice University, Computational and Applied Mathematics, Houston, TX, United States
Affiliation: Delft University of Technology, Department of Geotechnology, Delft, Netherlands
Pages: SI165-SI175
Published: 200607
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 47
Accession Number: 2007-031137
Categories: Applied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: WesternGeco, NOR, NorwayStanford University, USA, United StatesUniversity of Chicago, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 200709
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