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Effect of pore pressure on the velocity of compressional waves in low-porosity rocks.The velocity V sub p of compressional waves has been measured in rock samples of low porosity to confining pressures P sub c of 2 kb for a number of different constant pore pressures P sub p. An effective pressure defined by P sub e = P sub c-nP sub p, n less than or equal to 1, is found to be the determining factor in the behavior of V sub p rather than an effective pressure defined simply by the differential pressure Delta P = P sub c-P sub p. As pore pressure increases at constant effective pressure, the value of n increases and approaches 1, but as effective pressure increases at constant pore pressure, the value of n decreases. These observations are consistent with Biot's theory of the propagation of elastic waves in a fluid-saturated porous solid.
Document ID
19720052365
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Todd, T.
Simmons, G.
(MIT Cambridge, Mass., United States)
Date Acquired
August 6, 2013
Publication Date
July 10, 1972
Publication Information
Publication: Journal of Geophysical Research
Volume: 77
Subject Category
Geophysics
Accession Number
72A36031
Funding Number(s)
CONTRACT_GRANT: NAS9-8102
Distribution Limits
Public
Copyright
Other

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