Phase Encoding of Shots in Pre-Stack Seismic Migration

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Description

Frequency-domain shot-record migration can produce higher quality images than Kirchhoff migration but typically at a greater cost. The computational cost of shot-record migration is the product of the number of shots in the survey and the expense of each individual migration. Many attempts to reduce this cost have focused on the speed of the individual migrations, trying to achieve a better trade-off between accuracy and speed. Another approach is to reduce the number of migrations. We investigate the simultaneous migration of shot records using frequency-domain shot-record migration algorithms. The difficulty with this approach is the production of so-called cross terms ... continued below

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38 p.

Creation Information

GHIGLIA, DENNIS C.; MORTON, SCOTT A.; OBER, CURTIS C & ROMERO, LOUIS September 2, 1999.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 13 times . More information about this article can be viewed below.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

Frequency-domain shot-record migration can produce higher quality images than Kirchhoff migration but typically at a greater cost. The computational cost of shot-record migration is the product of the number of shots in the survey and the expense of each individual migration. Many attempts to reduce this cost have focused on the speed of the individual migrations, trying to achieve a better trade-off between accuracy and speed. Another approach is to reduce the number of migrations. We investigate the simultaneous migration of shot records using frequency-domain shot-record migration algorithms. The difficulty with this approach is the production of so-called cross terms between unrelated shot and receiver wavefields, which generate unwanted artifacts or noise in the final image. To reduce these artifacts and obtain an image comparable in quality to the single-shot-per-migration result, we have introduced a process called phase encoding which shifts or disperses these cross terms. The process of phase encoding thus allows one to trade signal-to-noise ratio for the speed of migrating the entire survey. Several encoding functions and two application strategies have been tested. The first strategy, combining multiple shots per migration and using each shot only once, provides a reduction in computation directly related to the number of shots combined. The second strategy, performing multiple migrations of all the shots in the survey, provides a means to reduce the cross-term noise through stacking the resulting images. The additional noise in both strategies may be tolerated if it is no stronger than the inherent seismic noise in the migrated image, and if the final image is achieved with less cost.

Physical Description

38 p.

Notes

OSTI as DE00012663

Medium: P; Size: 38 pages

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  • Journal Name: Journal of Geophysics; Other Information: Submitted to Journal of Geophysics

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  • Report No.: SAND98-1463J revised
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 12663
  • Archival Resource Key: ark:/67531/metadc626364

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • September 2, 1999

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

Description Last Updated

  • April 12, 2017, 2:35 p.m.

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GHIGLIA, DENNIS C.; MORTON, SCOTT A.; OBER, CURTIS C & ROMERO, LOUIS. Phase Encoding of Shots in Pre-Stack Seismic Migration, article, September 2, 1999; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc626364/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.