Resistivity logging
Logging and geophysics of boring

In civil engineering, resistivity logging is used to determine the lithology of the ground traversed by a borehole. It can also be used to study the fracturing of a rock mass. It also complements surface electrical prospecting campaigns, by providing precise information on the local distribution of material resistivities as a function of depth, enabling interpretation of surface measurements by removing ambiguities. In particular, we can accurately determine the depth of interfaces and the thickness of the various geological layers revealed.

As we saw in paragraph 2.2 of the article