Inversion of Induced

Polarization Effect Using Cole-Cole and

GEMTIP Models

Haiyan Fu

12/13/2011

• Studying of the IP effect is important for developing the methods of subsurface geophysical exploration

• Modeling the IP effect can lead to accurate mineral discrimination

Cole-Cole model

11 1

1 { }eff mat Cm

i

GEMTIP model

0

0

3 ,2

ll

l

m

1

022

lCl

l ll

a

Geometric factors – Grain shape – Grain eccentricity– Grain size– Fraction volume %

(porosity)– Grain alignment

(anisotropy)

chalcopyritequartz monzonite porphyry

10 mm

a1

pyrite

Reservoir parameters– Matrix resistivity– Grain resistivity– Grain polarizability

( )d A m������������� �

1( )d mA ������������� �

CR ,,,, afc

The goal of inversion is to determine parameters from the observed complex resistivity data

Inversion