ABSTRACT

The effect of induced polarization on the electrical conductivity of rock samples is studied using a variable frequency (reversed square wave) technique while varying the concentration of saturating NaCl solution and shalyness of the samples. Induced polarization effects are analyzed from the recorded wave-forms for frequency variations between 0.2 cps and 30 cps. The rock samples are further characterized by their porosity, air permeability, and cation exchange capacity (CEC). The study found that the induced polarization effect increases with

  1. increasing permeability,

  2. decreasing shalyness (CEC),

  3. increasing salinity,

  4. increasing porosity, and

  5. frequency domain studies and theory.

It is noted that induced polarization effects observed using variable frequency techniques may vary significantly from observations using pulse-transient techniques.

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