1887

Abstract

Summary

Anisotropic azimuthal amplitude variation with offset (AVO) inversion works as an important tool to estimate elastic parameters and anisotropic parameters of underground medium from pre-stack and azimuthal seismic data in the geosciences. Shale formation with parallel vertical or near-vertical fractures is often described with orthogonal anisotropic medium. However, the problems, which more model parameters, higher condition number of forward solver and relatively stronger dependence on the initial model for traditional orthotropic azimuthal AVO inversion, render the poor stability of the estimated parameters. In this paper, we carry on the study on the approaches with wide azimuthal pre-stack seismic data to establish the azimuthal amplitude difference AVO forward solver of orthotropic media, and implement the azimuthal amplitude difference AVO inversion for the orthotropic parameters under Bayesian framework with smooth background constraint to reduce the condition number of forward solver and improve the robustness and stability of inversion. Besides, Cauchy and Gaussian probability distributions are respectively utilized as priori information of the model parameters and the likelihood function for enhancing the inversion precision. Finally, field data examples are finally used to verify the feasibility and stability of the proposed approach in the estimation of the anisotropic parameters in orthotropic medium.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201900681
2019-06-03
2024-03-28
Loading full text...

Full text loading...

References

  1. Bachrach, R.
    , 2015, Uncertainty and nonuniqueness in linearized AVAZ for orthorhombic media: The Leading Edge, 34, no. 9, 1048–1056.
    [Google Scholar]
  2. Pšenčík, I., and J. L.Martins
    , 2001, Properties of Weak Contrast PP Reflection/Transmission Coefficients for Weakly Anisotropic Elastic Media: Studia Geophysica et Geodaetica, 45, no. 2, 176–199.
    [Google Scholar]
  3. Pan, X., and G.Zhang
    , 2018, Model Parameterization and PP-Wave Amplitude Versus Angle and Azimuth (AVAZ) Direct Inversion for Fracture Quasi-Weaknesses in Weakly Anisotropic Elastic Media: Surveys in Geophysics, 39, 937–964.
    [Google Scholar]
  4. Rüger, A.
    , 1997, P-wave reflection coefficients for transversely isotropic models with vertical and horizontal axis of symmetry: Geophysics, 62, no. 3, 713–722.
    [Google Scholar]
  5. , 1998, Variation of P-wave reflectivity with offset and azimuth in anisotropic media: Geophysics, 63, no. 63, 935–947.
    [Google Scholar]
  6. Shaw, R. K., and M. K.Sen
    , 2004, Born integral, stationary phase and linearized reflection coefficients in weak anisotropic media: Geophysical Journal International, 158, no. 1, 225–238.
    [Google Scholar]
  7. Zong, Z., et al
    , 2017, Broadband seismic amplitude variation with offset inversion: Geophysics, 82, no. 3, M43–M53.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201900681
Loading
/content/papers/10.3997/2214-4609.201900681
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