1887

Abstract

Summary

The anisotropy exists widely underground, ignoring anisotropy in migration may lead to large positional errors. In the aspects of computational cost and efficiency, acoustic approximated anisotropic first-order stress-velocity qP-wave equations are better the elastic one. Considering the advantages of avoiding elastic modulus interpolation in rotated staggered-grid finite-difference (RSFD) scheme, so it’s more suitable for anisotropic qP-wave modeling and reverse time migration. However, RSFD scheme tends to cause numerical dispersion due to the need of larger steps. Using the optimal RSFD operator based on dispersion relation and least squares scheme can suppress spatial dispersion efficiently and enhance modeling accuracy, and further improve the imaing quality. Therefore, we construct the anisotropic wave-field extrapolator by LS-RSFD method, and implement accurate VTI and TTI pseudo-acoustic wave numerical modeling and reverse time migration.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201412617
2015-06-01
2020-03-29
Loading full text...

Full text loading...

References

  1. AlkhalifahT.
    [2000] An acoustic wave equation for anisotropic media. Geophysics, 65(4): 1239–1250.
    [Google Scholar]
  2. DuX, FletcherR, FowlerP J.
    [2008] A new pseudo-acoustic wave equation for VTI media. EAGE, Extended Abstracts.
    [Google Scholar]
  3. FletcherR, DuX, FowlerP J.
    [2008] A new pseudo-acoustic wave equation for TI media. SEG, Expanded Abstracts.
    [Google Scholar]
  4. HestholmS.
    [2009] Acoustic VTI modeling using high-order finite differences. Geophysics, 74(5): T67–T73.
    [Google Scholar]
  5. ZhangY, ZhangH Z, ZhangG Q.
    [2011] A stable TTI reverse time migration and its implementation. Geophysics, 76(3): WA3–WA11.
    [Google Scholar]
  6. SaengerE H and BohlenT.
    [2004] Finite-difference modelling of viscoelastic and anisotropic wave propagation using the rotated staggered grid. Geophysics, 69: 583–591.
    [Google Scholar]
  7. YanH, YangL, LiuH.
    [2014] Acoustic Reverse-time Migration with Least Squares Staggered-grid Finite-difference operators. EAGE, Extended Abstracts.
    [Google Scholar]
  8. ThomsenL.
    [1986] Weak elastic anisotropy. Geophysics, 51(10): 1954–1966.
    [Google Scholar]
  9. ChengJ B and KangW.
    [2014] Simulating propagation of separated wave modes in general anisotropic media, Part I: qP-wave propagators. Geophysics, 79(1): C1–C18.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201412617
Loading
/content/papers/10.3997/2214-4609.201412617
Loading

Data & Media loading...

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