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Estimating deep temperatures in the Soultz-sous-Forêts geothermal area (France) from magnetotelluric data
Abstract : An indirect electromagnetic geothermometer is used for deep temperature estimations in the Soultzsous-
Forêts geothermal area (France) using magnetotelluric sounding data. Validation of temperature
assessment carried out by comparison of the forecast temperature profile with temperature log from
the deepest borehole has resulted in the relative extrapolation accuracy of less than 2%. It is found
that the resistivity’s uncertainty caused by magnetotelluric inversion errors and by possible effects of
external factors very weakly affects the resulting temperature, with the latter being influenced
mainly by the ratio between the borehole length and the extrapolation depth. The temperature crosssection
constructed up to the depth 5000 m manifests local temperature maxima at large depths
beneath the wells GPK2 and RT1/RT3. The analysis of the temperature profile in GPK2 location
beneath 5000 m indicates that its behaviour continues to be of the conductive type (as in the depth
range of 3700 m–5000 m) up to the depth 6000 m, while manifesting convective type below this
depth. Finally, application of the indirect electromagnetic geothermometer for the deep temperature
forecasting in the Rittershoffen site enabled us to constrain the location for future drilling.
https://hal-brgm.archives-ouvertes.fr/hal-01356866
Contributeur : Anne-Marie Pouget <>
Soumis le : vendredi 26 août 2016 - 17:04:45
Dernière modification le : jeudi 14 mai 2020 - 15:36:02
Contributeur : Anne-Marie Pouget <>
Soumis le : vendredi 26 août 2016 - 17:04:45
Dernière modification le : jeudi 14 mai 2020 - 15:36:02