ERT+IP in hole geoelectrics

This methodology makes it possible to obtain a geoelectrical characterization of the subsurface with high vertical resolution, representing a valuable extension of traditional surface ERT/IP surveys, especially in contexts where the stratigraphy is complex or covered by low conductivity materials.

The principle of operation is similar to that of multielectrode surface surveys: data acquisition is by means of a georesistivimeter, which manages the sequential activation of electrodes, installed at different depths along the borehole walls. The holes can be single (for vertical down-hole type measurements) or multiple (for 2D and 3D cross-hole configurations), allowing direct exploration of the investigated volume horizontally and vertically. Electrodes can be temporarily lowered or permanently installed, depending on monitoring needs. Finally, performing repeated measurements over time (timelapse), especially in 3D configuration, is a powerful tool for dynamic monitoring.