| Title | The Chemical Properties of Yangyi High Temperature Geothermal Field in Tibet |
|---|---|
| Authors | ZHENG Xiuhua, DUAN Chenyang, LIU Haiyang |
| Year | 2013 |
| Conference | Stanford Geothermal Workshop |
| Keywords | geothermal water, chemical property, geothermometer, scale |
| Abstract | Abstract:Yangyi high temperature geothermal field was explored in the 1990¡¯s and now is being developed for power generation with 40 MWe of capacity in Tibet. Chemical Properties from 8 boreholes were analyzed to evaluate the resources and predict the scaling potential of this geothermal field. The results show that the geothermal water presents alkalescence with 7.5-9.5 of pH and the total dissolved solids(TDS) are low, and vary little ranging from 1.4 to 1.8g/l. The geothermal water is characterized by a dominant HCO3¨CNa composition according to the Piper diagram Compared the concentrations of some compositions in the thermal water with that in the cold spring around the field, it can be found that the concentrations of Li+, F-, Cl- (especially Li+) in the thermal water are higher, which indicates the thermal water supply is from deep water with the replenishment from atmospheric precipitation. Taking into account the cation and SiO2-temperature geothermometers, the temperature of the reservoir may be estimated to be about 180~210¡æ. |