Temperature forecasting from electromagnetic data

In this Chapter we discuss the methodology for temperature forecasting from EM sounding data. To this end the data collected in two areas are used: northern Tien Shan and Hengill geothermal area. It is shown that prior knowledge of the geology and hydrological conditions in the region under study can guide the location of EM sites with respect to the locations where the temperature is to be predicted and thereby reduce the average estimation errors. The results of the electromagnetic temperature extrapolation in depth indicate that the extrapolation accuracy essentially depends on the ratio of the well depth to the extrapolation depth. Soultz-sous-Forêts (France) case study demonstrates possibility of building the temperature model of the study area up to the depth of 5 km from results of MT sounding and available temperature logs.