Dictionary:Fluid substitution

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Calculation of the changes in physical properties that should result from changing the pore fluids from brine to oil or gas with specific fluid properties. The calculations usually use the (1951) equations[1] of Gassmann, although Biot[2] (1941), Brown-Korringa (1975)[3], and Rice-Cleary (1976) [4]are also cited. The calculations are used to predict how to interpret time-lapse measurements.


  1. Gassmann F. 1951. Über die Elastizität poröser Medien. Vierteljahrsschrift der Naturforschenden Gesellschaft in Zürich, 96, 1-23. Translated as: On elasticity of porous media, in Classics of Elastic Wave Theory, pp. 1-21, M. A. Pelissier, Ed., Soc. Expl. Geoph., Tulsa, 2005.
  2. Biot M. A. 1941. General theory of three-dimensional consolidation. J. Appl. Phys., 12, 155-164.
  3. Brown R. J. S., and Korringa J. 1975. On the dependence of the elastic properties of a porous rock on the compressibility of the pore fluid. GEOPHYSICS, 40, 608-616.
  4. Rice J. R. and Cleary M. P. 1976. Some basic stress diffusion solutions for fluid saturated elastic porous media with compressible constituents. Rev. Geoph. Space Phys., 14(2), 227-241.