1887

Abstract

Summary

Studying the relation between the effective pressure and the elastic wave velocities of the rock is of great importance for the oil/gas exploration and production. In this work, we investigate the effective pressure for sandstone elastic wave velocities experimentally. The sandstone samples are subjected to both confining and pore pressures, which are changed at the same amplitude and hence keep the differential pressure constant. The P-and S- wave velocities are then measured using the ultrasonic pulse transmission method. The results show that the velocities and elastic moduli decrease with the pore pressure while keeping the differential pressure constant. This indicates that the effective pressure is different from the differential pressure, which is inconsistent with the previous research and hence a new expression for the effective pressure is needed. The analysis of the experimental results show that the effective pressure coefficient is pressure-dependent and increases when the effective pressure decreases. This provides the basis for finding the appropriate expression for the effective pressure in the future.

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/content/papers/10.3997/2214-4609.201801013
2018-06-11
2024-03-29
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References

  1. Ba, J., Carcione, J. M., Cao, H., Yao, F. and Du, Q.
    [2013] Poro-acoustoelasticity of fluid-saturated rocks. Geophysical Prospecting, 61(3), 599–612.
    [Google Scholar]
  2. Grinfeld, M.A. and NorrisA.N.
    [1996] Acoustoelasticity theory and applications for fluid-saturated porous media. The Journal of the Acoustical Society of America, 100(3), 1368–1374.
    [Google Scholar]
  3. Han, T., Gurevich, B., Pervukhina, M., Clennell, M.B. and Zhang, J.
    [2016] Linking the pressure dependency of elastic and electrical properties of porous rocks by a dual porosity model. Geophysical Journal International, 205(1), 378–388.
    [Google Scholar]
  4. Prioul, R., Bakulin, A. and Bakulin, V.
    [2004] Nonlinear rock physics model for estimation of 3D subsurface stress in anisotropic formations: Theory and laboratory verification. Geophysics, 69(2), 415–425.
    [Google Scholar]
  5. Shapiro, S.A.
    [2003] Elastic piezosensitivity of porous and fractured rocks. Geophysics, 68(2), 482–486.
    [Google Scholar]
  6. [2017] Stress impact on elastic anisotropy of triclinic porous and fractured rocks. Journal of Geophysical Research Solid Earth, 122, 2034–2053.
    [Google Scholar]
  7. Sinha, B.K. and Plona, T.J.
    [2001] Wave propagation in rocks with elastic-plastic deformations. Geophysics, 66(3), 772–785.
    [Google Scholar]
  8. Todd, T. and Simmons, G.
    [1972] Effect of pore pressure on the velocity of compressional waves in low-porosity rocks. Journal of Geophysical Research, 77(20), 3731–3743.
    [Google Scholar]
  9. Winkler, K.W. and Liu, X.
    [1996] Measurements of third-order elastic constants in rocks. Journal of the Acoustical Society of America, 100(5), 1392–1398.
    [Google Scholar]
  10. Zimmerman, R.W., Somerton, W.H. and King, M.S.
    [1986] Compressibility of porous rocks. Journal of Geophysical Research, 91(B12), 12765–12777.
    [Google Scholar]
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