Dictionary:Cole-Cole relaxation model

ADVERTISEMENT
From SEG Wiki
Revision as of 15:01, 20 December 2011 by Wiki Admin (talk | contribs) (Initial import)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

(kōl kōl) A model for induced polarization (IP) effects in which the effective impedance varies as a power of the frequency. The complex resistivity ρ(ω) is given by

ρ(ω)=Ro{1–m[1–1/(1+iωτ)c]},


where Ro is the dc resistivity, τ is the time constant, and c is the frequency dependence. Typical ranges for parameters are m=0.1 to 1.0, depending on the mineral content, τ=10–4 to 104 depending on grain size, and c=0.2 to 0.6 depending on the particle size distribution. Compare Warburg impedance, for which the value of c is 0.5.