Numerical modelling of Alpine deep flow systems: a management and prediction tool for an exploited geothermal reservoir (Lavey-les-Bains, Switzerland)

摘要: The geothermal site of Lavey-les-Bains, Switzerland is an Alpine deep flow system in fractured crystalline rocks. Groundwater analyses since 1973 reveal a mixing process between warm component (68°C and TDS 1.4 g/L) cold shallow water. production rate the new well P600, installed 1997, has amplified this P201, for which decline temperature been observed. Numerical hydrogeological two-dimensional three-dimensional models heat, mass transport have developed to reproduce forecast long-term exploitation potential resource. computed inferred reservoir (100–130°C) agreement with geothermometers, whereas simulated thermal water flux (5,400–9,000 m3/day) probably underestimated. Different fluid scenarios can stabilization phases temperatures field 1997. For ratio calculated before during P600 comparable observed data; modelled tends towards P201 at 56°C after 10–15 years P600. Another proposed likely reduce output existing wells.