• 责任者：Wen Yuhua (College of Earth and Environmental Science ; Center for Hydrologic Cycle and Water Resources in Arid Region ; Lanzhou University ; Lanzhou 730000 ; China) ; Wang Nai’ang
• 刊名：Scientia Geographica Sinica
• 出版年：2011
• 卷期：31(6)
• 关键词：地下热水 ; geothermal water ; 水化学 ; hydrochemistry ; 甘肃 ; Gansu Province
• 页码：p.668-673
• 图表：4 illus., 3 tables, 31 refs.
• 分类号：1005
• issnNo：ISSN1000-0690
• isbnNo：CN22-1124/P

A geochemical study of geothermal water has been carried out in the Tianshui and its northern-southern area. Geothermal water of Wushan and Tianshui is bicarbonate water of low salinity characterized by pH in 7.94~9.06 and low total dissolved solids (TDS)(226~255 mg/L), which were probably formed by water-rock interaction between meteoric rain, biotite plagioclase gneiss rock and carbonate sediment in reservoir. The isotopic data show that the origin of thermal water is meteoric water and not severely affected by water-rock isotope exchange. Assessments of various chemical geothermometer applied on the geothermal waters suggested the probable existence of a deep geothermal reservoir of middle-low enthalpy (70~111 ℃) in the Tianshui and its northern-southern area. The sustainable utilization of the thermal water will be maintained if the total withdrawal rate is relatively small, and an alternative pumping and non-pumping pattern is used in Tianshui and its northern-southern area with mean yearly rainfall of near 500 mm.