The formations surrounding the borehole are subjected to an alternative
square-wave voltage applied via the upper and lower injection electrodes.
Following each injection cycle, the resulting potential difference over a
section of the formations is analysed as it decreases with time.
The form of this decreases curve is related to the chargeability of the
A high chargeability indicates that induced electrochemical potentials are able
to develop within the formations as a result of ion transfer between pore fluids
and semi-conductive metallic mineral grains present within the rocks.
The IP38 probe is particularly suitable for mining exploration in the context of
a disseminated sulphide mineralisation. In the hydrogeological domain, it can
also provide qualitative information about the permeability of potential aquifer
Lim designs, produces and commercializes measuring instruments and solutions dedicated to drilling.