1887

Abstract

Summary

A straightforward and naive implementation of elastic reverse time migration (ERTM) might produce images that are not very useful mainly because they are filled with noises arising from incorrectly imaged mode conversions, cross-talk, and back-scattered energy. Therefore, we present a ERTM workflow that overcomes these problems. We first employ vector-based normalized cross-correlation imaging conditions (VBNICs) for PP and PS reflections to avoid cross-talk and polarity reversal. Based on Poynting-vector imaging condition, we implement angle filtering to reduce low-wavenumber and high-amplitude noise. Then, we efficiently extract dip-angle gathers by using Poynting vectors and finally utilize them to attenuate the artifact caused by non-physical wave-mode conversions because their slopes differ from the migration dip. Numerical examples demonstrate that the proposed ERTM workflow can produce images with less noise and higher quality.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201900378
2019-04-24
2020-07-10
Loading full text...

Full text loading...

References

  1. Costa, J.C., Neto, F.A.S., Alcantara, M.R., Schleicher, J. and Novais, A.
    [2009] Obliquity-correction imaging condition for reverse time migration. GEOPHYSICS, 74(3), S57-S66.
    [Google Scholar]
  2. Klokov, A. and Fomel, S.
    [2013] Selecting an optimal aperture in Kirchhoff migration using dip-angle images. Geophysics, 78(6), S243–S254.
    [Google Scholar]
  3. Ravasi, M. and Curtis, A.
    [2013] Elastic imaging with exact wavefield extrapolation for application to ocean-bottom 4C seismic data. Geophysics, 78(6), S265–S284.
    [Google Scholar]
  4. Wang, W. and McMechan, G.A.
    [2015] Vector-based elastic reverse time migration. Geophysics, 80(6), S245–S258.
    [Google Scholar]
  5. Yan, J. and Sava, P.
    [2008] Isotropic angle-domain elastic reverse-time migration. Geophysics, 73(6), S229–S239.
    [Google Scholar]
  6. Yu, P., Geng, J., Li, X. and Wang, C.
    [2016] Acoustic-elastic coupled equation for ocean bottom seismic data elastic reverse time migration. Geophysics, 81(5), S333–S345.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201900378
Loading
/content/papers/10.3997/2214-4609.201900378
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