| Autor: |
Olga K. Zakharova, Viacheslav V. Spichak |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
Heat-Mass Transfer and Geodynamics of the Lithosphere ISBN: 9783030635701 |
| DOI: |
10.1007/978-3-030-63571-8_4 |
| Popis: |
The paper presents a review of recent advances in using of electromagnetic geothermometry in geothermal areas Travale (Italy), Hengill (Iceland) and Soultz-sous-Forets (France). 2D temperature model built along a magnetotelluric profile crossing Travale (Italy) geothermal system enabled to constrain the location of potential supercritical reservoir at large depth by two seismic reflection horizons, which correspond to isotherm TSCF = 400 °C characterizing appearance of supercritical fluids and isotherm TBDT = 550–600 °C characterizing brittle / ductile transition. At shallow depths (< 2 km) P-T conditions support formation of superheated steam - gas mixture detected by drilled boreholes. 3D temperature model of the Hengill (Iceland) geothermal area built up to the depth of 20 km from electromagnetic sounding data enabled to explain location of magma pockets at shallow depth. Joint analysis of the resistivity and temperature models taking into account gravity anomalies allowed to distinguish domains in the crust with different thermal regimes, which, in turn, explains the observed seismicity structure by thermo-mechanical rather than by crust spreading effect. Deep temperature model built in the Soultz-sous-Forets (France) from the profile magnetotelluric data and temperature well logs was used for locating deep heat sources and predicting convective fluid circulation in the granitic basement below 5 km. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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