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GEOREF RECORD

Automated velocity-model building with wavepath tomography

Moritz M. Fliedner and Dimitri Bevc
Automated velocity-model building with wavepath tomography (in Velocity estimation for depth imaging, William S. Harlan (editor), Robert T. Langan (editor) and Tamas Nemeth (editor))
Geophysics (September 2008) 73 (5, Suppl.): VE195-VE204

Abstract

Wavefield-continuation migration generally is recognized as superior to Kirchhoff methods in complex velocity models, such as below rugose salt bodies. It accounts for multipathing, sharp velocity contrasts, and the limited bandwidth of seismic wave propagation. wavepath tomography builds the velocity model in a way that is consistent with the wavefield-migration operator. Traveltime residuals are back-projected along a wavepath instead of rays. The actual wavefield-continuation operator is used to represent the wave propagation between surface source/receiver pairs and subsurface reflection points. A wavepath is obtained by multiplying impulse responses from a surface location and a reflection point. The inversion matrix is kept to a manageable size by restricting the wavepath to the first Fresnel zone. The considerable expense of computing a single wavepath kernel in comparison to ray tomography is partially offset by the smaller number of back projections necessary to sample the velocity model adequately. We have used wavepath tomography to build subsalt velocity models using 2D synthetic data. Wavepath tomography was implemented in 3D.


ISSN: 0016-8033
EISSN: 1942-2156
Coden: GPYSA7
Serial Title: Geophysics
Serial Volume: 73
Serial Issue: 5, Suppl.
Title: Automated velocity-model building with wavepath tomography
Title: Velocity estimation for depth imaging
Author(s): Fliedner, Moritz M.Bevc, Dimitri
Author(s): Harlan, William S.editor
Author(s): Langan, Robert T.editor
Author(s): Nemeth, Tamaseditor
Affiliation: 3DGeo, Santa Clara, CA, United States
Affiliation: Landmark Graphics, Highlands Ranch, CO, United States
Pages: VE195-VE204
Published: 200809
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 45
Accession Number: 2009-085041
Categories: Applied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N18°00'00" - N30°04'00", W98°00'00" - W80°30'00"
Secondary Affiliation: Chevron, 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: 200946
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