Super-virtual interferometric diffractions as guide stars

Handle URI:
http://hdl.handle.net/10754/561684
Title:
Super-virtual interferometric diffractions as guide stars
Authors:
Dai, Wei; Fei, Tong; Luo, Yi; Schuster, Gerard T. ( 0000-0001-7532-1587 )
Abstract:
A significant problem in seismic imaging is seismically seeing below salt structures: large velocity contrasts and the irregular geometry of the salt-sediment interface strongly defocus both the downgoing and upgoing seismic wavefields. This can result in severely defocused migration images so as to seismically render some subsalt reserves invisible. The potential cure is a good estimate of the subsalt and salt velocity distributions, but that is also the problem: severe velocity contrasts prevent the appearance of coherent subsalt reflections in the surface records so that MVA or tomographic methods can become ineffective. We now present an interferometric method for extracting the diffraction signals that emanate from diffractors, also denoted as seismic guide stars. The signal-to-noise ratio of these interferometric diffractions is enhanced by N, where N is the number of source points coincident with the receiver points. Thus, diffractions from subsalt guide stars can then be rendered visible and so can be used for velocity analysis, migration, and focusing of subsalt reflections. Both synthetic and field data records are used to demonstrate the benefits and limitations of this method. © 2011 Society of Exploration Geophysicists.
KAUST Department:
Earth Science and Engineering Program; Earth Sciences 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:
10.1190/1.3628002
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.authorDai, Weien
dc.contributor.authorFei, Tongen
dc.contributor.authorLuo, Yien
dc.contributor.authorSchuster, Gerard T.en
dc.date.accessioned2015-08-03T09:02:14Zen
dc.date.available2015-08-03T09:02:14Zen
dc.date.issued2011-01en
dc.identifier.issn10523812en
dc.identifier.doi10.1190/1.3628002en
dc.identifier.urihttp://hdl.handle.net/10754/561684en
dc.description.abstractA significant problem in seismic imaging is seismically seeing below salt structures: large velocity contrasts and the irregular geometry of the salt-sediment interface strongly defocus both the downgoing and upgoing seismic wavefields. This can result in severely defocused migration images so as to seismically render some subsalt reserves invisible. The potential cure is a good estimate of the subsalt and salt velocity distributions, but that is also the problem: severe velocity contrasts prevent the appearance of coherent subsalt reflections in the surface records so that MVA or tomographic methods can become ineffective. We now present an interferometric method for extracting the diffraction signals that emanate from diffractors, also denoted as seismic guide stars. The signal-to-noise ratio of these interferometric diffractions is enhanced by N, where N is the number of source points coincident with the receiver points. Thus, diffractions from subsalt guide stars can then be rendered visible and so can be used for velocity analysis, migration, and focusing of subsalt reflections. Both synthetic and field data records are used to demonstrate the benefits and limitations of this method. © 2011 Society of Exploration Geophysicists.en
dc.publisherSociety of Exploration Geophysicistsen
dc.subjectDiffractionen
dc.titleSuper-virtual interferometric diffractions as guide starsen
dc.typeArticleen
dc.contributor.departmentEarth Science and Engineering Programen
dc.contributor.departmentEarth Sciences 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.authorDai, Weien
kaust.authorSchuster, Gerard T.en
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