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Reference velocity model estimation from prestack waveforms; coherency optimization by simulated annealing

Evgeny Landa, Wafik B. Beydoun and Albert Tarantola
Reference velocity model estimation from prestack waveforms; coherency optimization by simulated annealing
Geophysics (August 1989) 54 (8): 984-990

Abstract

Coherency inversion, which consists of maximizing a semblance function calculated from unstacked seismic waveforms, has the potential of estimating reliable velocity information without requiring traveltime picking on unstacked data.In this work, coherency inversion is based on the assumption that reflectors' zero-offset times are known and that the velocity in each layer may vary laterally. The method uses a type of Monte Carlo technique termed the generalized simulated annealing method for updating the velocity field. At each Monte Carlo step, time-to-depth conversion is performed. Although this procedure is slow at convergence to the global minimum, it is robust and does not depend on the initial model or topography of the objective function. Applications to both synthetic and field data demonstrate the efficiency of coherency inversion for estimating both lateral velocity variations and interface depth positions.


ISSN: 0016-8033
EISSN: 1942-2156
Coden: GPYSA7
Serial Title: Geophysics
Serial Volume: 54
Serial Issue: 8
Title: Reference velocity model estimation from prestack waveforms; coherency optimization by simulated annealing
Affiliation: Inst. Phys. Globe Paris, Paris, France
Pages: 984-990
Published: 198908
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 15
Accession Number: 1989-053172
Categories: Applied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, block diag.
Secondary Affiliation: Elf Aquitaine, FRA, FranceMass. Inst. Technol., USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 1989
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