1887

Abstract

Summary

Seismic data acquired at the sea bottom are more and more available. It is now possible to record shear and converted waves thanks to this type of data. It opens up the possibility to constrain bot h P- and S-wave velocities with tools such as full waveform inversion (FWI). The data recorded at the sea bottom can be particularly sensitive to attenuation, especially at long-offset, thus often viscoelastic FWI is required. In this study we use a 2D viscoelastic FWI scheme on synthetic data to assess possibility to treat the attenuation parameters as passive parameters of the inversion and still recover acceptable models for P-and S-wave velocities. Alternatively, we assess the inversion of the seismic velocities as well as the parameters controlling attenuation altogether. We find that inverting for all parameters together is necessary to get access to the short wavelength features of the subsurface model because the short-wavelength attenuation model is required to properly treat reflections and converted waves close to the critical angle. Inverting long-offset data in conjugation with a smooth attenuation model is sufficient to yield the long wavelength features of the velocity models.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201601012
2016-05-30
2024-03-29
Loading full text...

Full text loading...

References

  1. Belahi, T., Fuji, N., & Singh, S. C.
    [2015] Elastic V ersus Viscoelastic Full Waveform Inversion of Near-offset and Wide-angle Data in the Presence of Attenuation. 77th EAGE Conference and Exhibition 2015, p. 1–4
    [Google Scholar]
  2. Kurzmann, A., Przebindowska, A., Kohn, D., & Bohlen, T.
    [2013] Acoustic full waveform tomography in the presence of attenuation: a sensitivity analysis. Geophysical Journal International, 195(2), p985–1000
    [Google Scholar]
  3. Lailly, P.
    [1983] The seismic inverse problem as a sequence of before stack migration. Conference on Inverse Scattering, Theory and Applications, SIAM, Expanded Abstracts, 206–220
    [Google Scholar]
  4. Martin, G. S., Marfurt, K. J., & Larsen, S.
    [2002] Marmousi-2: An updated model for the investigation of AVO in structurally complex areas. SEG Technical Program Expanded Abstracts, 21(1), 1979–1982.
    [Google Scholar]
  5. Quintal, B., Steeb, H., Frehner, M., Schmalholz, S. M., & Saenger, E. H.
    [2012] Pore fluid effects on S-wave attenuation caused by wave-induced fluid flow. Geophysics, 77(3), L13–L23
    [Google Scholar]
  6. Robertsson, J. O. a., Blanch, J. O. and Symes, W. W.
    [1994] Viscoelastic finite-difference modeling. Geophysics, 59(9)
    [Google Scholar]
  7. Tarantola, A.
    [1988] Theoretical Background for the Inversion of Seismic Waveforms, Including Elasticity and Attenuation. Pure and Applied geophysics, 128, p365–399
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201601012
Loading
/content/papers/10.3997/2214-4609.201601012
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