Integrated Field Surveys with Complex of Electroprospecting Methods Using Broadband Multifunction EM Instruments

In a number of cases, it is necessary to combine several methods during geological mapping and exploration projects. For hydrocarbon exploration these are MT-MVP, TDEM, FDEMS-IP, CSAMT, less often AMT, MT, MVP, DES-IP, TEM. It is difficult at times for a contractor to acquire various equipment sets and maintain software for processing, visualizing, analyzing and interpreting data. To overcome these difficulties, increase efficiency and productivity of the entire integrated electroprospecting complex, designed were 4-channel and 8-channel broadband multifunction EM instruments GEPARD including all the necessary sensors and accessories for field data acquisition, processing, editing and analysis of all ground EM methods. EM data acquisition system is complemented by low power portable multifunction current source for investigations with control source methods up to 200–300m. For deep investigations with a controlled source, other mid-range and high-power transmitters can be used. However, the main focus for the deep soundings is on successful integration of MT, AMT and MVP methods as the most geologically and economically effective for investigations in the 10–150000m depth interval. Positive experience of integrated EM surveys has been accumulated in North America, Asia and Africa using instruments adapted for both ground and marine EM data acquisition system applications.