Mitigation of defocusing by statics and near-surface velocity errors by interferometric least-squares migration with a reference datum

Handle URI:
http://hdl.handle.net/10754/611770
Title:
Mitigation of defocusing by statics and near-surface velocity errors by interferometric least-squares migration with a reference datum
Authors:
Sinha, Mrinal; Schuster, Gerard T. ( 0000-0001-7532-1587 )
Abstract:
Imaging seismic data with an erroneous migration velocity can lead to defocused migration images. To mitigate this problem, we first choose a reference reflector whose topography is well-known from the well logs, for example. Reflections from this reference layer are correlated with the traces associated with reflections from deeper interfaces to get crosscorrelograms. Interferometric least-squares migration (ILSM) is then used to get the migration image that maximizes the crosscorrelation between the observed and the predicted crosscorrelograms. Deeper reference reflectors are used to image deeper parts of the subsurface with a greater accuracy. Results on synthetic and field data show that defocusing caused by velocity errors is largely suppressed by ILSM. We have also determined that ILSM can be used for 4D surveys in which environmental conditions and acquisition parameters are significantly different from one survey to the next. The limitations of ILSM are that it requires prior knowledge of a reference reflector in the subsurface and the velocity model below the reference reflector should be accurate.
KAUST Department:
Earth Science and Engineering
Citation:
Mitigation of defocusing by statics and near-surface velocity errors by interferometric least-squares migration with a reference datum 2016, 81 (4):S195 GEOPHYSICS
Publisher:
Society of Exploration Geophysicists
Journal:
GEOPHYSICS
Issue Date:
23-May-2016
DOI:
10.1190/geo2015-0637.1
Type:
Article
ISSN:
0016-8033; 1942-2156
Sponsors:
The research reported in this publication was supported by the King Abdullah University of Science and Technology (KAUST) in Thuwal, Saudi Arabia. We thank the sponsors of the CSIM consortium for their support. We would also like to thank the high-performance computing center of KAUST for providing access to their supercomputing facilities.
Additional Links:
http://library.seg.org/doi/10.1190/geo2015-0637.1
Appears in Collections:
Articles

Full metadata record

DC FieldValue Language
dc.contributor.authorSinha, Mrinalen
dc.contributor.authorSchuster, Gerard T.en
dc.date.accessioned2016-06-06T07:27:09Z-
dc.date.available2016-06-06T07:27:09Z-
dc.date.issued2016-05-23-
dc.identifier.citationMitigation of defocusing by statics and near-surface velocity errors by interferometric least-squares migration with a reference datum 2016, 81 (4):S195 GEOPHYSICSen
dc.identifier.issn0016-8033-
dc.identifier.issn1942-2156-
dc.identifier.doi10.1190/geo2015-0637.1-
dc.identifier.urihttp://hdl.handle.net/10754/611770-
dc.description.abstractImaging seismic data with an erroneous migration velocity can lead to defocused migration images. To mitigate this problem, we first choose a reference reflector whose topography is well-known from the well logs, for example. Reflections from this reference layer are correlated with the traces associated with reflections from deeper interfaces to get crosscorrelograms. Interferometric least-squares migration (ILSM) is then used to get the migration image that maximizes the crosscorrelation between the observed and the predicted crosscorrelograms. Deeper reference reflectors are used to image deeper parts of the subsurface with a greater accuracy. Results on synthetic and field data show that defocusing caused by velocity errors is largely suppressed by ILSM. We have also determined that ILSM can be used for 4D surveys in which environmental conditions and acquisition parameters are significantly different from one survey to the next. The limitations of ILSM are that it requires prior knowledge of a reference reflector in the subsurface and the velocity model below the reference reflector should be accurate.en
dc.description.sponsorshipThe research reported in this publication was supported by the King Abdullah University of Science and Technology (KAUST) in Thuwal, Saudi Arabia. We thank the sponsors of the CSIM consortium for their support. We would also like to thank the high-performance computing center of KAUST for providing access to their supercomputing facilities.en
dc.language.isoenen
dc.publisherSociety of Exploration Geophysicistsen
dc.relation.urlhttp://library.seg.org/doi/10.1190/geo2015-0637.1en
dc.rightsArchived with thanks to GEOPHYSICSen
dc.subjectLeast-squares migrationen
dc.subjectstaticsen
dc.subject2Den
dc.titleMitigation of defocusing by statics and near-surface velocity errors by interferometric least-squares migration with a reference datumen
dc.typeArticleen
dc.contributor.departmentEarth Science and Engineeringen
dc.identifier.journalGEOPHYSICSen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorSinha, Mrinalen
kaust.authorSchuster, Gerard T.en
All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.