1887

Abstract

Summary

We present new method for elastic waveform inversion in anisotropic media which is based on a combination of the well-known (single scattering) Born approximation with a Gassmann-consistent rock physics model for the overall properties of materials with interconnected pores and fractures. Previous attempts to perform a Born inversion for fracture parameters have been based on an model of isolated fractures. However, the predictions of the isolated fracture model can be very different from those of a Gassmann-consistent model of interconnected pores and fractures, due to the phenomenon of dispersion. We have performed a series of numerical experiments to investigate the effects of pore fluid pressure communication on the results of a Born inversion for fracture density. Our numerical experiments are associated with a HTI model of interconnected pores and vertically aligned fractures, but our rock physics based approach to elastic waveform inversion can in principle also be used for anisotropic systems of lower symmetry. The results of our numerical experiments suggest that it is essential to use a Gassmann-consistent rock physics model that accounts for hydraulic connection between the pores and fractures when performing waveform inversion directly for fracture parameters.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201600997
2016-05-30
2024-03-29
Loading full text...

Full text loading...

References

  1. Ali, A. and Jakobsen, M.
    [2011] On the accuracy of Rugers approximations for reflection coefficients in HTI media: implications for the determination of fracture density and orientation from seismic A V AZ data. Journal of Geophysics and Engineering, 8, 372–393.
    [Google Scholar]
  2. Bansal, R. and Sen, M. K.
    [2010] Ray-Born inversion for fracture paramerters. Geophysical Journal International, 180, 1274–1288.
    [Google Scholar]
  3. Eaton, D.W.S. and Stewart, R.R.
    [1994] Migration/inversion for transversely isotropic media, Geophys. J. Int., 119, 667–683.
    [Google Scholar]
  4. Jakobsen, M., McCann, C.M. and Johansen, T.A.
    [2003] The acoustic signature of fluid flow in complex porous media, Journal of Applied Geophysics, 54, 219–246.
    [Google Scholar]
  5. Jakobsen, M. and Hudson, J.A.
    [2003] Visco-elastic waves in rock-like composites. Studia Geophysica et Geodaetica, 47, 793–826.
    [Google Scholar]
  6. Jakobsen, M. and Ursin
    [2015] Full waveform inversion in the frequency domain using direct iterative T-matrix methods. Journal of Geophysics and Engineering, 12, 400–418.
    [Google Scholar]
  7. Jakobsen, M., Pilskog, I. and Lopez, M.
    [2015] Generalized T-matrix approach to seismic modelling of fractured reservoirs and related anisotropic systems. Extended abstract, 77th EAGE meeting, Madrid.
    [Google Scholar]
  8. Kamath, N. and Tsvankin, I.
    [2015] Sensitivity analysis for elastic full-waveform inversion in VTI media. Centre for Wave Phenomena report, CWP-805.
    [Google Scholar]
  9. Pilskog, I., Lopez, M. and Jakobsen, M.
    [2015a] Linearized waveform inversion for fracture density. Extended abstract, 16th International workshop on seismic anisotropy, Natal, Brazil.
    [Google Scholar]
  10. [2015b] Full waveform inversion for fracture parameters. Extended abstract, 77th EAGE meeting, Madrid.
    [Google Scholar]
  11. Shaw, R.K. and Sen, M.K.
    [2004] Born integral, stationary phase and linearized reflection coefficients in weak anisotropic media, Geophys J. Int., 158, 225–238.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201600997
Loading
/content/papers/10.3997/2214-4609.201600997
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