Formation resistivity
R_t is defined by mineralization of the rock matrix and saturating fluids.
The simplest and most practical models are based on:
- formation porosity
\phi_e
- water-saturated shaliness
V_{sh}
- water saturation volumetric share s_w
| Archie Model |
| Indonesia Model (Poupon-Leveaux) |
| Simandeux Model |
| Dual-Water Model (DW) |
| Waxman-Smits-Thomas Model (WST) |