1887

Abstract

Summary

We experience the application of a genetic algorithm driven full-waveform inversion (GA FWI) on two expanding spread records acquired in a forward-reverse configuration along a 2D seismic land profile. Maximum source to receiver offset reach up to 40 km for the forward record and up to 30 km for the reverse record. The FWI is performed in time domain and with the acoustic 2D approximation. The data area is characterized by rough topography and complicate near surface and the seismograms show a low S/ N ratio. We test whether, given the poor data quality and using a simple data misfit computation based on waveform envelopes and L1norm, the order of approximation of the spatial derivatives can be reduced without losing anything significant with respect to higher order approximations. The GA FWI experiments consider only the direct and diving waves of the shot records and constitute part of a wider project in which GA FWI is applied to both the expanding spread and the standard data to estimate a low-resolution velocity model apt to be used as a starting model for gradient based FWI. It turns out that reducing the order of approximation in the spatial derivatives computation from the 4th to the 2nd order does not appreciably change the matching between observed and predicted data as well as the estimated velocity models, while the computing time is drastically reduced. Also, in such data conditions, the adoption of more sophisticated misfit functions does not seem to produce significant improvements in the results.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201601189
2016-05-30
2024-03-28
Loading full text...

Full text loading...

References

  1. Alford, R. M., Kelly, K. R., & Boore, D. M.
    (1974). Accuracy of finite difference modeling of the acoustic wave equation. Geophysics , 39 (6), 834–842.
    [Google Scholar]
  2. Al-Yaqoobi, A. and Warner, M.
    [2013] Full waveform inversion – dealing with limitations of 3D onshore seismic data. 83th Annual international Meeting, SEG, Expanded Abstract.
    [Google Scholar]
  3. Brossier, R., Operto, S. and Virieux, J.
    [2009] Seismic imaging of complex onshore structures by 2D elastic frequency-domain full-waveform inversion. Geophysics, 74, no. 6, WCC105–WCC118.
    [Google Scholar]
  4. Cohen, G.
    (2002). Higher-order Numerical Methods for Transient Wave Equations. Berlin: SpringerVerlag.
    [Google Scholar]
  5. Guasch, L., Burgess, T., and Warner, M.,
    [2015] Optimised adaptive waveform inversion - improved convergence via conjugate gradients and superior step-length calculation. 77th Conference & Exhibition, EAGE, Expanded Abstract.
    [Google Scholar]
  6. Plessix, R. E., Baeten, G., de Maag, J. W., Klaassen, M., Rujie, Z. and Zhifei, T.
    [2010] Application of acoustic full waveform inversion to a low-frequency large-offset land data set. 80th Annual international Meeting, SEG, Expanded Abstract.
    [Google Scholar]
  7. Sajeva, A., Bienati, N., Aleardi, M., Stucchi, E. and Mazzotti, A.
    [2014a] Estimation of velocity macro-models using stochastic full-waveform inversion. 84th Annual international Meeting, SEG, Expanded Abstract.
    [Google Scholar]
  8. Scrocca, D., Doglioni, C., Innocenti, F., Manetti, P., Mazzotti, A., Bertelli, L., Burbi, L., D’Offizi, S.,
    [2003] CROP ATLAS: seismic reflection profiles of the Italian crust. Memorie Descrittive della Carta Geologica d’Italia62, 15–46.
    [Google Scholar]
  9. Sirgue, L., Barkved, O.I., Dellinger, J., Etgen, J., Albertin, U. and Kommedal, J.H.
    [2010] Full waveform inversion: The next leap forward in imaging at Valhall. First Break, 28, 65–70.
    [Google Scholar]
  10. Stucchi, E., Zanzi, L. and Mazzotti, A.
    [2003] Lessons learned from the acquisition and processing of the CROP C-ALPS/b, CROP 03, CROP 04, CROP 18 NVR and expanding spread seismic data. Memorie Descrittive Carta Geologica d’Italia., 62, 75–88.
    [Google Scholar]
  11. Tarantola, A.
    [1984] Linearized inversion of seismic reflection data. Geophysical Prospecting, 32, 998–1015.
    [Google Scholar]
  12. Tognarelli, A., Stucchi, E., Bienati, N., Sajeva, A., Aleardi, M. and Mazzotti, A.
    [2015] Two-grid stochastic full waveform inversion of 2D marine seismic data. 77th Conference & Exhibition, EAGE, Expanded Abstract.
    [Google Scholar]
  13. Virieux, J. and Operto, S.
    [2009] An overview of full-waveform inversion in exploration geophysics. Geophysics, 74, no.6, WCC1–WCC26.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201601189
Loading
/content/papers/10.3997/2214-4609.201601189
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