1887
  1. Home
  2. Conferences
  3. Conference Proceedings
  4. 76th EAGE Conference and Exhibition 2014
  5. Conference paper

Abstract

Summary

We present a prestack time-migration tool for local improvement of the seismic migration-velocity model. The method is based on time-remigration trajectories. It determines kinematic parameters using local-slope information of seismic reflection events. These parameters, in turn, are used to locally correct the velocity model. The main advantage of this technique is that it allows to carry out a moveout correction not just at a fixed point in a zero-offset (post-stack) time-migrated gather, but varying through all offsets of a common image gather (CIG), and taking into account the reflection-point displacement in the midpoint direction. In other words, it provides for migration velocity analysis (MVA) by time-remigration trajectories in prestack data. Tests on synthetic and SMAART-Sigsbee2B data show that the proposed tool not only increased the velocity-model resolution, but also provides a plausible time-migrated image.

© EAGE Publications BV
Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.20141498
2014-06-16
2024-04-19

  • From This Site

    /content/papers/10.3997/2214-4609.20141498
    dcterms_title,dcterms_subject,pub_keyword
    -contentType:Journal -contentType:Contributor -contentType:Concept -contentType:Institution
    10
    5
Loading full text...

Full text loading...

References

  1. Al-Yahya, K.M.
    [1989] Velocity analysis by iterative profile migration. Geophysics, 54(06), 718–729.
     [Google Scholar]
  2. Coimbra, T.A., de Figueiredo, J.J.S., Novais, A., Schleicher, J. and Arashiro, S.
    [2013a] Migration velocity analysis using residual diffraction moveout in the pre-stack depth domain. Annual WIT report, 17, this report.
     [Google Scholar]
  3. Coimbra, T.A., de Figueiredo, J.J.S., Schleicher, J., Novais, A. and Costa, J.
    [2013b] Migration velocity analysis using residual diffraction moveout in the poststack depth domain. Geophysics, 78(3), S125–S135, doi: 10.1190/geo2012‑0340.1.
     https://doi.org/10.1190/geo2012-0340.1 [Google Scholar]
  4. Coimbra, T.A., Santos, H.B., Schleicher, J. and Novais, A.
    [2013c] Migration Velocity Analysis using Time-Remigration Trajectory in Prestack Data. 13th International Congress of The Brazilian Geophysical Society & EXPOGEF, 3, Rio de Janeiro, Brazil, 1–5.
     [Google Scholar]
  5. Fomel, S.
    [2003] Velocity continuation and the anatomy of residual prestack time migration. Geophysics, 67(5), 1650–1661.
     [Google Scholar]
  6. [1994] Method of velocity continuation in the problem of seismic time migration. Russian Geology and Geophysics, 35(5), 100–111.
     [Google Scholar]
  7. Fomel, S., Landa, E. and Taner, M.T.
    [2007] Poststack velocity analysis by separation and imaging of seismic diffractions. Geophysics, 72(6), U89–U94, ISSN 6, doi: 10.1190/1.2781533.
     https://doi.org/10.1190/1.2781533 [Google Scholar]
  8. Liptow, F. and Hubral, P.
    [1995] Migrating around in circles. The Leading Edge, 14(11), 1125–1127.
     [Google Scholar]
  9. Liu, Z. and Bleistein, N.
    [1995] Migration velocity analysis: Theory and an iterative algorithm. Geophysics, 60(01), 142–153.
     [Google Scholar]
  10. Novais, A., Costa, J. and Schleicher, J.
    [2008] GPR velocity determination by image-wave remigration. Journal of Applied Geophysics, 65(2), 65–72.
     [Google Scholar]
  11. Schleicher, J., Hubral, P. and Höcht, G.
    [1997] Seismic constant-velocity remigration. Geophysics, 62(2), 589–597.
     [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.20141498
Loading
Prestack Migration Velocity Analysis Using Time-remigration Trajectories
Conference Proceedings 2014, 1 (2014); https://doi.org/10.3997/2214-4609.20141498
/content/papers/10.3997/2214-4609.20141498
/content/papers/10.3997/2214-4609.20141498
Loading

Data & Media loading...

Most Cited This Month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error