Units

There are several important quantities associated with electrical rock properties. These, along with the most commonly used units, are tabulated below. Note that since electrical resistivity is the reciprocal of the conductivity:

\[\rho = \frac{1}{\sigma}\]

and

\[1 \; S/m = 1 \; \Omega m\]

Property	Symbol	Units
Electric Field	\(\vec E\)	N/C or V/m
Current Density	\(\vec J\)	A/m \(\!^2\)
Electrical Conductivity	\(\sigma\)	S/m
Electrical Resistivity	\(\rho\)	\(\Omega m\)
Chargeability (Cole-Cole model)	\(\eta\)	Unitless
Intrinsic Chargeability	\(\eta_{app}\)	ms
Intrinsic Chargeability (normalized)	\(\eta_{app}\)	mV/V
Time Relaxation Constant	\(\tau\)	s
Phase Constant	\(C\) or \(\alpha\)	Unitless