The resistivity method is designed to yield information on formations or bodies having anomalous electric conductivity and it has been used for a long time to map boundaries between layers having different conductivities. It is employed in engineering geophysics to map bedrock, for determining the homogeneity of the terrain and possible sinkholes, in groundwater studies to determine salinity and the depth to the water table.
It is convenient and customary for most resistivity techniques to define a response function called apparent resistivity, Roa , which can be evaluated or estimated from surface measurements and correlated with geological information, resulting maps and sections of the electrical resistivity variation correlated geologically.
DC geoelectrical methods are frequently used with good results, and to investigate the geological structure covered by water (rivers, lakes).
Application of geoelectrical investigations:
- Research on Inorganic Contaminants
- Determining the Geological and Hydrological Conditions
- Borehole Investigation
- Archeological Surveying
- Lake and River Prospecting
- Wind farms and photovoltaic exploration
- Minerals exploration
Geoelectrical investigation methods: