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Geothermal Reservoir Forming Model and Development Direction of North-South Geothermal Zone In Southern Tibet
Geothermal resource evaluation and development potential analysis are important basis for accurate development of geothermal resources in the zone. On the basis of synthesizing the previous research results and the latest field work results, the geothermal reservoir forming model in the key geothermal zones in southern Tibet is established by the analysis of the main factors such as geothermal geological conditions, main structural characteristics and geothermal water supply sources. The high-temperature geothermal resources in southern Tibet is under the background of high geothermal flow value in Tethys convergent plate edge geothermal domain, the high temperature geothermal fluid formed by atmospheric precipitation and snowmelt water as cold water supply source, infiltrating along the fault to the deep melt to heat. The fluid interacts with the surrounding rock, finally discharged through hot springs, geothermal wells and other forms. According to the density of hydrothermal display, the scale of active structure development, and the market demand for geothermal power generation and heating, The three nearly north-south graben tropics of Shenza-Dingjie, Naqu-Yangbajing-Yadong and Riduo-Cuona in southern Tibet are selected as geothermal resource development potential areas, the total geothermal reserves is 8.71×1015kJ, which is equivalent to 6.21× 104t of standard coal, have a good prospect of geothermal market development.