UnitsΒΆ
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 |