180 Geophysics in Geothermal Exploration Conclusion ERT is one of the geophysical techniques both sensitive to water content and temperature. Traditional ERT equipment, known as resistivimeters, combining a central instrument that controls current injection and potential measurements, remain highly effective for obtaining high-resolution knowledge of conductivity distribution in the ground. However, the depth of investigation is not compatible with the demands of geothermal energy. The use of recording units separated from high-power transmitters for deep investigation is more appropriate. Unfortunately, this requires the management of long reception cables in the field, which is very laborious and can generate strong coupling effects that are problematic for the final quality of the data. Thanks to the use of self-contained receivers, deep 3D field surveys are accessible to organized and meticulous field operators. The cost of this type of survey, provided the team is experienced, remains very low when compared with other geophysical techniques or with poorly positioned drilling. ERT alone cannot guarantee geothermal drilling, but when combined with geological knowledge, it can guide the man of the art in his interpretation. These new acquisition systems and protocols pave the way for wider use of ERT in medium-depth geothermal energy.
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