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Magneto-Telluric Method Applied to Geothermal Prospecting*
Experience has shown that geothermal fields are usually associated with strong resistivity anomalies. Reservoir resistivity is a function of porosity, permeability and formational water salinity. In particular, increased temperature reduces resistivity. For example, a temperature increase of 100°C will reduce formation resistivity to one-fifth or even one-tenth, of its value. In many cases, increased temperature is accompanied by increased water salinity.
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