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This article will review some of what is known about the concept of
``dynamic permeability,'' as it is now commonly called, within the
subject of poroelasticity.
There are competing terms that are used sometimes. In particular,
Biot (1956b) introduced the concept of dynamic viscosity, and this
concept is incorporated into the dynamic permeability concept as we
shall see. Dynamic tortuosity is closely related to dynamic
permeability since the electric tortuosity is related (inversely)
to the high frequency limit of the dynamic permeability, whereas the
usual Darcy permeability is exactly the low frequency limit of the
dynamic permeability. The tortuosity is also related to the effective
mass of the fluid in the presence of the solid frame or to the
effective mass of the solid in the presence of the pore fluid.
We will discuss all of these concepts at greater length in the
following sections.

** Next:** EQUATIONS OF POROELASTICITY
** Up:** Berryman: Dynamic permeability
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Stanford Exploration Project

7/8/2003