The geological interpretation of log overlays is easily extended to sedimentary lithologies other than the common reservoir lithologies of sandstone, limestone, and dolomite. The common evaporite minerals of gypsum, anhydrite, and halite (listed in the order of their evaporitic appearance in the Usiglio Sequence) have highly distinctive logging properties as shown in the table:
| Pe | neutron porosity | density porosity (bulk density) | |
| Halite | 4.7 | -3 | 39 (2.04) |
| Anhydrite | 5.1 | -2 | -16 (2.98) |
| Gypsum | 4.0 | 60 | 21 (2.35) |
and on the figure. Halite and anhydrite have markedly low and high bulk densities, respectively, while the very high neutron porosity of gypsum is caused by hydrogen in its water of crystallization.
