1887
Volume 64, Issue 1
  • E-ISSN: 1365-2478

Abstract

ABSTRACT

Decomposing seismic data in local slopes is the basic idea behind velocity‐independent imaging. Using accurate moveout approximations enables computing moveout attributes such as normal moveout velocity and nonhyperbolic parameters as functions of zero‐offset travel time. Mapping of moveout attributes is performed from the pre‐stack seismic data domain into the time‐migrated image domain. The different moveout attributes have different accuracy for a given moveout approximation that depends on the corresponding order of travel‐time derivative. The most accurate attribute is the zero‐offset travel time, and the nonhyperbolic parameter has the worst accuracy, regardless of the moveout approximation. Typically, the mapping of moveout attributes is performed using a point‐to‐point procedure, whereas the generalized moveout approximation requires two point‐to‐point mappings. Testing the attribute mapping on the different models shows that the accuracy of mapped attributes is model dependent, whereas the generalized moveout approximation gives practically exact results.

Loading

Article metrics loading...

/content/journals/10.1111/1365-2478.12284
2015-12-15
2024-10-03
Loading full text...

Full text loading...

References

  1. AlkhalifahT.2000. The offset‐midpoint traveltime equation for transversely isotropic media. Geophysics65, 1316–1325.
    [Google Scholar]
  2. AlkhalifahT.2011. Scanning anisotropy parameters in complex media. Geophysics76, U13–U22.
    [Google Scholar]
  3. AlkhalifahT. and TsvankinI.1995. Velocity analysis for transversely isotropic media. Geophysics60, 1550–66.
    [Google Scholar]
  4. BliasE.2009. Long‐offset NMO approximations for a layered VTI model: model study. SEG Technical Program Expanded Abstracts28, 3745–3749.
    [Google Scholar]
  5. BurnettW. and FomelS.2009. 3‐D velocity‐independent elliptically anisotropic moveout correction. Geophysics74, WB129–WB136.
    [Google Scholar]
  6. CasasantaL.2010. NMO‐ellipse independent 3D moveout analysis in τ‐p domain. 80th SEG annual international meeting, Expanded Abstracts30, 289–294.
  7. CasasantaL. and FomelS.2011. Velocity‐independent tau‐p moveout in a vertically‐varying VTI medium. Geophysics76, U45–U57.
    [Google Scholar]
  8. CastleR.J.1994. Theory of normal moveout. Geophysics59, 983–999.
    [Google Scholar]
  9. ClaerboutJ.1978. Straight edge determination of interval velocity. Stanford Exploration Project Report14, 13–16.
    [Google Scholar]
  10. de BazelaireE.1988. Normal moveout revisited—inhomogeneous media and curved interfaces. Geophysics53, 143–157.
    [Google Scholar]
  11. FomelS.2007. Velocity‐independent time‐domain seismic imaging using local event slopes. Geophysics72(3), S139–S147.
    [Google Scholar]
  12. FomelS. and GrechkaV.2001. Nonhyperbolic reflection moveout of P waves. An overview and comparison of reasons: Report CWP‐372, Colorado School of Mines.
  13. FomelS. and StovasA.2010. The generalized non‐hyperbolic moveout approximation. Geophysics75(2), U9–U18.
    [Google Scholar]
  14. FowlerP.J., JacksonA., GaffneyJ. and BorehamD.2008. Direct nonlinear traveltime inversion in layered VTI media. 78th SEG annual international meeting, Expanded Abstracts, 3028–3032.
  15. MalovichkoA.A.1978. A new representation of the traveltime curve of reflected waves in horizontally layered media. Applied Geophysics in Russian91, 47–53 (translation provided by Sword 1987a).
    [Google Scholar]
  16. OttoliniR.1983. Velocity independent seismic imaging. Stanford Exploration Project Report37, 59–68.
    [Google Scholar]
  17. RiabinkinL.A.1957. Fundamentals of resolving power of controlled directional reception (CDR) of seismic waves. In: Slant‐Stack Processing (1991), 36–60. SEG (translated and paraphrased from Prikladnaya Geofiizika16, 3–36).
  18. RieberF.1936. A new reflection system with controlled directional sensitivity. Geophysics1(1), 97–106.
    [Google Scholar]
  19. StovasA. and AlkhalifahT.2012. A new traveltime approximation for TI media. Geophysics77, C37–C42.
    [Google Scholar]
  20. ZhangF. and UrenN.2001. Approximate explicit ray velocity functions and travel times for p‐waves in TI media. SEG Technical Program Expanded Abstracts20, 106–109.
    [Google Scholar]
/content/journals/10.1111/1365-2478.12284
Loading
/content/journals/10.1111/1365-2478.12284
Loading

Data & Media loading...

  • Article Type: Research Article
Keyword(s): Mapping; Moveout

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