Velocities of elastic waves andv
P/v
S ratios in dry and water-saturated rock samples at high pressure |
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| Authors: | M P Volarovich V A Budnikov |
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| Institution: | (1) Section of Physics of the Source and Precursors of Earthquakes, Institute of Physics of the Earth, USSR Academy of Sciences, Bolshaja Gruzinskaja 10, 123242 Moscow, USSR |
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| 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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| Keywords: | velocity changes Rock mechanics Fluids in porous media |
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