1887

Abstract

Summary

We apply the joint approach of traveltime tomography and Full Waveform Inversion (FWI) to a synthetic experiment in media exhibiting Tilted Transverse Isotropy (TTI) Symmetry. We adopt a Finite-Difference Frequency-Domain (FDFD) approach for modeling acoustic waves within the seismic modeling framework, Zephyr. The synthetic crosshole experiment consists of a tilted layer sequence chosen to simulate a realistic TTI environment. Models of seismic velocity and the anisotropic parameters were obtained from anisotropic traveltime inversion and used as the starting models for monoparameter FWI to update the velocity model only. The effects of parameter crosstalk are evident within the traveltime results and are mitigated by the application of a Gaussian smoothing operator before FWI. The final FWI model contains all of the prominent features from the true model, although there are some artefacts present in these results. Steeply dipping artefacts are introduced due to mismatches between the velocity and background anisotropy models at larger offsets. We mitigate the presence of these artefacts by stringent offset weighting of the data at lower frequencies. The successful application of FWI to this synthetic experiment suggests that this approach is a suitable candidate for field data which display TTI symmetry.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201700793
2017-06-12
2024-03-29
Loading full text...

Full text loading...

References

  1. Alkhalifah, T.
    [2000] An acoustic wave equation for anisotropic media. Geophysics, 65(4), 1239–1250.
    [Google Scholar]
  2. Chapman, C.H. and Pratt, R.G.
    [1992] Traveltime tomography in anisotropic media-I. Theory. Geophysical Journal International, 109(1), 1–19.
    [Google Scholar]
  3. Gholami, Y., Brossier, R., Operto, S., Ribodetti, A. and Virieux, J.
    [2013] Which parameterization is suitable for acoustic vertical transverse isotropic full waveform inversion? Part 1: Sensitivity and trade-off analysis. Geophysics, 78(2), R81–R105.
    [Google Scholar]
  4. Hadden, S.M., Smithyman, B.R. and Pratt, R.G.
    [2016] Frequency-domain Acoustic Wave Modelling through TI Media in Western Canada-Implications for Anisotropic FWI. In: 78th EAGE Conference and Exhibition 2016.
    [Google Scholar]
  5. Operto, S., Virieux, J., Ribodetti, a. and Anderson, J.E.
    [2009] Finite-difference frequency-domain modeling of viscoacoustic wave propagation in 2D tilted transversely isotropic (TTI) media. Geophysics, 74(5), T75–T95.
    [Google Scholar]
  6. Pratt, R. and Chapman, C.
    [1992] Traveltime tomography in anisotropic media-II. Application. Geophysical Journal International, 109(1), 20–37.
    [Google Scholar]
  7. Pratt, R., Shin, C. and Hicks, G.
    [1998] Gauss-Newton and full Newton methods in frequency-space seismic waveform inversion. Geophysical Journal International, 133(2), 341–362.
    [Google Scholar]
  8. Smithyman, B.R., Pratt, R.G. and Hadden, S.M.
    [2015] Zephyr: Open-source Parallel Seismic Waveform Inversion in an Integrated Python-based Framework. In: AGU Fall Meeting.
    [Google Scholar]
  9. Thomsen, L.
    [1986] Weak elastic anisotropy. Geophysics, 51(10), 1954–1966.
    [Google Scholar]
  10. Zhou, H., Zhang, G. and Bloor, R.
    [2006] An anisotropic acoustic wave equation for modeling and migration in 2D TTI media. In: 76th Annual International Meeting, SEG. 194–198.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201700793
Loading
/content/papers/10.3997/2214-4609.201700793
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