1887

Abstract

Summary

In this manuscript, an alternative converted-wave image with elastic reverse-time migration is proposed. In the proposed method, PS image is generated by applying the imaging condition to the P- and S-wave stress wavefields. In decoupled wave equation, which is used to separate wavefields, we can obtain the P- and S-wave particle-velocity (or displacement) wavefields and P-wave stress, however we cannot obtain the pure S-wave stress. To fully excavate potential of using stress to produce converted-wave image, we construct a quasi S-wave stress from S-wave particle-velocity wavefield using the so called ‘acoustic shear wave equation’. We illustrate such S-wave stress can provide polarity-consistent converted-wave image theoretically and numerically.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201800638
2018-06-11
2020-04-09
Loading full text...

Full text loading...

References

  1. Chang, W. F., and McMechanG. A.
    . Reverse-time migration of offset vertical seismic profiling data using the excitation-time imaging condition[J]. Geophysics, 51(1): 67–84.
    [Google Scholar]
  2. DuQ, GuoC F, ZhaoQ, et al.
    Vector-based elastic reverse time migration based on scalar imaging condition[J]. Geophysics, 2017.
    [Google Scholar]
  3. Li, Z., Zhang, H., Liu, Q., Han, W.
    Numeric simulation of elastic wavefield separation by staggering grid high-order finite-difference algorithm (in Chinese)[J]. Oil Geophysical Prospecting, 2007, 42(5): 510–515.
    [Google Scholar]
  4. Ma, D., and ZhuG.
    . P- and S-wave separated elastic wave equation numerical modeling (in Chinese)[J]. Oil Geophysical Prospecting, 2003, 38(5): 482–486.
    [Google Scholar]
  5. Sun, R., McMechanG.A.
    Scalar reverse-time depth migration of prestack elastic seismic data[J]. Geophysics, 2001, 66(5): 1519–1527.
    [Google Scholar]
  6. WangW, McMechanG A.
    Vector-based elastic reverse time migration[J]. Geophysics, 2005, 80(6): S245–S258.
    [Google Scholar]
  7. Whitmore, N. D.
    Iterative depth migration by backward time propagation[J]: 53rd Annual International Meeting, SEG, Expanded Abstracts, 1983, 382–385.
    [Google Scholar]
  8. Xiao, X., and W. S.Leaney
    . Local vertical seismic profiling (VSP) elastic reverse-time migration and migration resolution: Salt-flank imaging with transmitted P-to-S waves[J]. Geophysics, 2010, 75(2): S35–S49.
    [Google Scholar]
  9. YanJ, SavaP.
    Isotropic angle-domain elastic reverse-time migration[J]. Geophysics, 2008, 73(6).
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201800638
Loading
/content/papers/10.3997/2214-4609.201800638
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