Chemical Changes in Natural Features and Geothermal Well Discharges in Oradea and Surroundings

Abstract

The Oradea reservoir is an integrated part of the main exploited geothermal reservoir located in the western part of Romania. It is situated almost entirely within the Oradea city, but is hydrodynamically connected with a second reservoir in the Felix Spa resort and 1 Mai resort. Development exploitation of Oradea and surrounding geothermal resources has resulted in changes to the chemistry in natural features as well as of the discharged fluids. In order to monitor these changes, water samples were taken and complete analysed and further used for classifying them and evaluating reservoir behavior through exploitation. A systematic evaluation of the studied geothermal area was done, by using also previous data. The calculated fluid compositions through numerical modeling were compared with the compositions of the wells discharged from the reservoirs.