DC Electro-Kinetic Coupling Coefficient of Porous Samples in the Laboratory: Experimentation and Modelling
E. Walker*, P.W.J. Glover, E. Tardif, J. Ruel.
Universitй Laval, Quйbec, Canada
(walker.emilie.1@ulaval.ca, paglover@ggl.ulaval.ca)
Introduction
Electro-kinetic properties of rocks allow the generation of an electric potential by the flow of an aqueous
fluid through a porous media. The electrical potential is called the streaming potential, and the streaming
potential coupling coefficient Cs is the ratio of the generated electric potential to the pressure difference that
causes the fluid flow. The streaming potential coupling coefficient for rocks is described in the steady-state
regime by the well known Helmholtz-Smoluchowski equation, and is supported by a relatively small body
of experimental data. However, electro-kinetic measurement is a powerful tool to characterise a rock with
one simple measurement (Glover and Walker, 2009). This simple characterisation of a rock on field could
induce further development of different area of expertise such as oil and gas exploration, reservoir
prospection and monitoring, volcano and earthquake monitoring, the underground sequestration of CO2 .or
borehole geophysics (Glover and Jackson, 2010)
http://www.cspg.org/documents/Conventions/Archives/Annual/2011/130-DC_Electro-Kinetic_Coupling_Coefficient.pdf