| Title | Interpretation of geochemical data from wells in the western geothermal field of Romania |
|---|---|
| Authors | Oana Stanasel and Ludovic Gilau |
| Year | 2003 |
| Conference | Iceland Geothermal Conference |
| Keywords | reservoir temperature, western Romania, scaling potential. |
| Abstract | The western geothermal field of Romania is a low temperature geothermal area. In this paper data from four production wells are presented. The chemical composition of these waters was analysed by standard methods and subsequently classified by the use of the Cl-SO4-HCO3 triangular diagram. Another basic diagram, Na-K-Mg, was used to classifywaters according to the state of equilibrium at given temperatures. The geothermal waters are bicarbonated-sodium-chloride type. Chemical geothermometers were used to predict subsurface temperature. The calculated quartz geothermometer values for the geothermal well waters indicate reservoir temperatures higher than values for chalcedonygeothermometers and Na/K geothermometer values are very different. The silica-enthalpy mixing model was used to try to define the source temperature of the hot water component. The results could be an evidence of mixing with cold waters in all the fields taken for study. The WATCH program was used to interpret the equilibrium state of the reservoirs and to predict scaling tendencies. The saturation index for calcite exceeds 1,which indicates that CaCO3 scaling problems will occur. |