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Resistivity

Resistivity is a bulk property of a material and describes how well that material inhibits current flow. The resistivity of geological materials varies greatly and is mainly dependent on the content and salinity of water. DC electrical resistivity surveying is carried out by transmitting an electrical current into the ground by use of galvanic electrodes and then measure the resulting potential using two or more potential electrodes. The measured potential can be related to bedrock and overburden resistivity, their geometry and distribution. Depending on the purpose of the investigation, Resistivity Profiling, Vertical Electrical Sounding (VES) or Electrical Resistivity Tomography (ERT) is used to map either vertical or horizontal structures of the subsurface, or both in the case of ERT.

GeoVista possess the Lund imaging system from ABEM, a multi electrode system that provides fast, accurate and automated resistivity and IP surveys in 2D and 3D. Resistivity surveying is widely used in mineral exploration, groundwater exploration, environmental and engineering applications.

Reference projects:

– Detection of possible flow paths for creosote which had contaminated the ground around a wood treating facility on the island of Gotland
– Detection of leakage in various hydro power embankment dams
– Location of suitable sites for a geothermal heating system in Kristineberg by evaluation of important parameters such as the depth to the ground water table, bedrock and fracture zones