Governing equations for the coupled electromagnetics and acoustics of porous media

Steve Pride
Phys. Rev. B 50, 15678 – Published 1 December 1994
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Abstract

The macroscopic governing equations controlling the coupled electromagnetics and acoustics of porous media are derived here from first principles. The porous material is assumed to consist of a packing of solid grains that is saturated by an electrolyte. A sedimentary rock is an example of such a material. The approach is to volume average the equations known to apply in the fluid and solid phases while allowing for the boundary conditions that exist on the fluid-solid interface. The coupling is due to a layer of excess charge adsorbed to the sufaces of the solid grains that is balanced by mobile ions in the fluid electrolyte; i.e., the coupling is electrokinetic in nature. The derived equations have the form of Maxwell’s equations coupled to Biot’s equations with coupling occurring in the flux-force (or transport) relations. The frequency-dependent macroscopic-transport coefficients are explicitly obtained and related to each other. Onsager reciprocity is derived and is not simply postulated.

  • Received 18 August 1994

DOI:https://doi.org/10.1103/PhysRevB.50.15678

©1994 American Physical Society

Authors & Affiliations

Steve Pride

  • Institut de Physique du Globe de Paris, Département de Géomagnétisme, 4 place Jussieu, 75252 Paris cedex 05, France

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Issue

Vol. 50, Iss. 21 — 1 December 1994

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