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For many years,
traditional seismic processing
approximated the propagation of seismic waves by
the acoustic wave equation 18.
Wyllie 1956 suggested a simple
empirical time-average
equation to relate the wave's phase velocity *v* to
porosity , fluid velocity *v*_{f}, and rock matrix velocity *v*_{m}:

| |
(45) |

This relationship was used extensively in the interpretation of sonic
well log measurements.
Raymer 1980
suggests an improved expression for sandstones.

** Next:** General inversion theory
** Up:** Alternative rock velocity models
** Previous:** Terzaghi's model
Stanford Exploration Project

3/9/1999