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Velocities of elastic waves andv P/v S ratios in dry and water-saturated rock samples at high pressure

Abstract

Elastic wave velocities and the ratiov P/v S were studied for dry and initially saturated samples of carbonate and crystalline rocks at pressures to 2 kbar. In initially saturated samplesv P increases in crystalline rock, whereas in sedimentary rock it may either increase or decrease with increasing pressure. Under the same conditionsv S remains approximately constant in crystalline rocks and decreases in sedimentary samples. The ratiov P/v S as a function of pressure increases in dry rocks and decreases in saturated ones. Saturated samples always have higherv P/v S ratios than dry ones. It appears that the geometry of the pore space influences the acoustic properties of saturated crystalline rocks.

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References

  1. [1]

    Volarovich, M. P., et al.Physico-mechanical Properties of Rocks and Minerals at High Pressures and Temperatures (Nauka, Moscow, 1974).

  2. [2]

    Petkevich, G. I., andVerbitsky, T. Z. Elastic Properties of Rocks Saturated with Fluids (Naukova dumka, Kiev, 1965).

  3. [3]

    Dortman, N. B. and Magid, M. Sh. (1968), Elastic wave velocity in crystalline rocks and its dependence on water saturation, Doklady, USSR Acad. Sci. 179 (1).

  4. [4]

    Magid, M. Sh. (1972),The effect of water saturation on shear velocities in crystalline rocks, Geology and geophysics, No. 6.

  5. [5]

    Silaeva, O. I., andZamakhaev, A. M. (1974),Variation of velocity anisotropy in water saturated rock samples, Izv, USSR Acad. Sci, Physics of the Earth, No. 8.

  6. [6]

    Nur, A., and Simmons, G. (1969), The effect of saturation on velocity in low-porosity rocks. Earth and Planet. Sci. Lett. 7 (2).

  7. [7]

    Nur, A. and Simmons, G. (1969), The effect of viscosity of fluid phase on velocity in low-porosity rocks, Earth and Planet. Sci. Lett. 7 (2).

  8. [8]

    Todd, T. and Simmons, G. (1972), Effect of pore pressure on the velocity of compressional waves in lowporosity rocks, J. Geoph. Res. 77 (29).

  9. [9]

    Wang, C., Lin, W., and Weng, H. R. (1975), The effect of water and pressure on velocities of elastic waves in a foliated rocl, J. Geophys. Res. 80 (8).

  10. [10]

    Budnikov, V. A. (1975), Experimental equipment for multi-purpose studies of rock samples under pressure, Izv. Vyssh. Ochebn. Zaved., ser. Geology and exploration, No. 6.

  11. [11]

    Volarovich, M. P. and Balakishiev, Sh. A. (1971), The effect of fluid phase on ultrasonic velocities in volcanic rocks at high pressure, Colloid J. 33 (4).

  12. [12]

    Scholz, C. H., Sykfs, L. R. and Aggarwal, J. P. (1973), Earthquake prediction: a physical basis, Science 181 (4102).

  13. [13]

    Miachkin, V. I., Brace, W. F., Sobolev, G. A., and Dietrich, J. H. (1975), Two models for earthquake forerunners, Pure Appl. Geophys. 113 (1/2).

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Volarovich, M.P., Budnikov, V.A. Velocities of elastic waves andv P/v S ratios in dry and water-saturated rock samples at high pressure. PAGEOPH 117, 795–805 (1978). https://doi.org/10.1007/BF00879980

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Key words

  • velocity changes
  • Rock mechanics
  • Fluids in porous media