1887

Abstract

Summary

The stress conditions influence the elastic parameters and therefore the anisotropy of the shales. Such an influence is important for geophysical applications like an overpressure prediction from seismic data, or hydrocarbon production monitoring using time-lapse seismic measurements.

We present an application of a theoretical approach, known as porosity deformation approach (PDA) on our own experimentally obtained data. We introduce the theoretical background of the approach and validate it on a real data set. We propose an optimization algorithm called universal exponent approach (UNE) as an extension for PDA. We also propose the constant anellipticity approach (CAN), which is created for estimation of stress dependent inclined velocities in the transversely isotropic medium.

Moreover we present the experimentally measured full data set of velocities as functions of stress for two vertical transversely isotropic shales.

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/content/papers/10.3997/2214-4609.201600426
2016-05-02
2024-04-24
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References

  1. Biot, M.A.
    [1962] Mechanics of deformation and acoustic propagation in porous media. Journal of applied physics, 33(4), 1482–1498.
    [Google Scholar]
  2. Brown, R.J. and Korringa, J.
    [1975] On the dependence of the elastic properties of a porous rock on the compressibility of the pore fluid. Geophysics, 40(4), 608–616.
    [Google Scholar]
  3. Ciz, R. and Shapiro, S.A.
    [2008]. Stress-dependent anisotropy in transversely isotropic rocks: Comparison between theory and laboratory experiment on shale. Geophysics, 74(1), D7–D12.
    [Google Scholar]
  4. Eaton, B.A.
    [1975, January] The equation for geopressure prediction from well logs. Fall Meeting of the Society of Petroleum Engineers of AIME. Society of Petroleum Engineers.
    [Google Scholar]
  5. Gurevich, B.
    [2004] A simple derivation of the effective stress coefficient for seismic velocities in porous rocks. Geophysics, 69(2), 393–397.
    [Google Scholar]
  6. Landro, M., Digranes, P. and Stronen, L.K.
    [2001] Mapping reservoir pressure and saturation changes using seismic methods-possibilities and limitations. First Break, 19(12).
    [Google Scholar]
  7. Mayr, S.I. and Burkhardt, H.
    [2006] Ultrasonic properties of sedimentary rocks: effect of pressure, saturation, frequency and microcracks. Geophysical Journal International, 164(1), 246–258.
    [Google Scholar]
  8. Mayr, S.I., Niemann, R. and Shapiro, S.A.
    [2015] Elastic anisotropy of shale under triaxial loading conditions: Application of the porosity deformation approach. Submitted to Geophysics.
    [Google Scholar]
  9. Ryan-Grigor, S.
    [1998] SEG Technical Program Expanded Abstracts 1998.
    [Google Scholar]
  10. Shapiro, S.A.
    [2003] Elastic piezosensitivity of porous and fractured rocks. Geophysics, 68(2), 482–486.
    [Google Scholar]
  11. Shapiro, S.A. and Kaselow, A.
    [2005] Porosity and elastic anisotropy of rocks under tectonic stress and pore-pressure changes. Geophysics, 70(5), N27–N38.
    [Google Scholar]
  12. Thomsen, L.
    [1986] Weak elastic anisotropy. Geophysics, 51(10), 1954–1966. ISO 690.
    [Google Scholar]
  13. Winterstein, D.F. and Paulsson, B.N.P.
    [1990] Velocity anisotropy in shale determined from crosshole seismic and vertical seismic profile data:Geophysics, 55, 470–479.
    [Google Scholar]
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