# Wyllie time-average equation

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${\displaystyle {\frac {1}{v}}={\frac {\phi }{v_{f}}}+{\frac {1-\phi }{v_{m}}}}$
where, ${\displaystyle \phi }$ is the total porosity, ${\displaystyle v}$ is the wave's measured phase velocity, ${\displaystyle v_{m}}$ is the velocity of the rock matrix, and ${\displaystyle v_{f}}$ is the velocity of the fluid in the pores.