Geoelectrical imaging 2D & 3D and induced polarization are new electrical survey methods. They use an array of electrodes to measure and give out the detailed image of the subsurface layers. Instead of providing simple layer information as traditional sounding method, these methods can provide images of complex structures, the zone of heterogeneity in small size. In geological engineering and geotechnical investigation they are used to determine the thickness of overburden, to determine the tectonic zone, the boundary between rocks of different lithological composition, especially they can detect carst caves and death pits.
Geoelectrical imaging 2D & 3D and induced polarization can be carried out to depths that range from a few meters to a hundred meters under favorable conditions. By using the multi-functional equipment and different electrode arrays to measure the potential and intensity of the electrical current, from which can calculate the apparent resistivity of the subsurface earth.
Geoelectrical imaging 2D & 3D and induced polarization are processed using professional software RES2DINV. The last result is the sections which estimate approximately true resistivity sections of earth.
Fieldwork, processing and interpretation of electrical imaging and IP are carried out in accordance with Vietnamese standard 9433:2012.