Wave-equation reflection traveltime inversion

Handle URI:
http://hdl.handle.net/10754/561697
Title:
Wave-equation reflection traveltime inversion
Authors:
Zhang, Sanzong; Schuster, Gerard T. ( 0000-0001-7532-1587 ) ; Luo, Yi
Abstract:
The main difficulty with iterative waveform inversion using a gradient optimization method is that it tends to get stuck in local minima associated within the waveform misfit function. This is because the waveform misfit function is highly nonlinear with respect to changes in the velocity model. To reduce this nonlinearity, we present a reflection traveltime tomography method based on the wave equation which enjoys a more quasi-linear relationship between the model and the data. A local crosscorrelation of the windowed downgoing direct wave and the upgoing reflection wave at the image point yields the lag time that maximizes the correlation. This lag time represents the reflection traveltime residual that is back-projected into the earth model to update the velocity in the same way as wave-equation transmission traveltime inversion. No travel-time picking is needed and no high-frequency approximation is assumed. The mathematical derivation and the numerical examples are presented to partly demonstrate its efficiency and robustness. © 2011 Society of Exploration Geophysicists.
KAUST Department:
Earth Science and Engineering Program; Physical Sciences and Engineering (PSE) Division; Environmental Science and Engineering Program
Publisher:
Society of Exploration Geophysicists
Journal:
SEG Technical Program Expanded Abstracts 2011
Issue Date:
Jan-2011
DOI:
10.1190/1.3627756
Type:
Article
ISSN:
10523812
Appears in Collections:
Articles; Environmental Science and Engineering Program; Physical Sciences and Engineering (PSE) Division; Earth Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorZhang, Sanzongen
dc.contributor.authorSchuster, Gerard T.en
dc.contributor.authorLuo, Yien
dc.date.accessioned2015-08-03T09:02:31Zen
dc.date.available2015-08-03T09:02:31Zen
dc.date.issued2011-01en
dc.identifier.issn10523812en
dc.identifier.doi10.1190/1.3627756en
dc.identifier.urihttp://hdl.handle.net/10754/561697en
dc.description.abstractThe main difficulty with iterative waveform inversion using a gradient optimization method is that it tends to get stuck in local minima associated within the waveform misfit function. This is because the waveform misfit function is highly nonlinear with respect to changes in the velocity model. To reduce this nonlinearity, we present a reflection traveltime tomography method based on the wave equation which enjoys a more quasi-linear relationship between the model and the data. A local crosscorrelation of the windowed downgoing direct wave and the upgoing reflection wave at the image point yields the lag time that maximizes the correlation. This lag time represents the reflection traveltime residual that is back-projected into the earth model to update the velocity in the same way as wave-equation transmission traveltime inversion. No travel-time picking is needed and no high-frequency approximation is assumed. The mathematical derivation and the numerical examples are presented to partly demonstrate its efficiency and robustness. © 2011 Society of Exploration Geophysicists.en
dc.publisherSociety of Exploration Geophysicistsen
dc.subjectFull waveform inversionen
dc.subjectReflectionen
dc.subjectTomographyen
dc.subjectTraveltimeen
dc.titleWave-equation reflection traveltime inversionen
dc.typeArticleen
dc.contributor.departmentEarth Science and Engineering Programen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentEnvironmental Science and Engineering Programen
dc.identifier.journalSEG Technical Program Expanded Abstracts 2011en
dc.contributor.institutionSaudi Aramco, Saudi Arabiaen
kaust.authorSchuster, Gerard T.en
kaust.authorZhang, Sanzongen
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