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运用水化学和同位素示踪的原理追溯地热水的水岩相互作用和起源,得出武山和天水地热水为pH较高(7.94～9.06)的低TDS(226～255 mg/L)HCO3型水,通渭和清水地热水为pH较低(7.1～8.07)的较高TDS(915～1 793 mg/L)SO4型水,地热水的水化学特征主要受不同的围岩及与围岩相互作用的程度所控制。地热水的δD和δ18O值说明地热水起源于大气降水,且未受水-岩同位素交换明显影响。综合应用各种地热温标,估算地热水的热储温度为70～111℃,属于中低温地热资源。对年均降雨量约500 mm的天水及其南北地区,应采取采、停交替的地热水利用方式。
Using the principles of water chemistry and isotope tracing, we can trace the water-rock interaction and origin of hot water, and draw the conclusion that the low TDS (226-255 mg / L) HCO3 Geothermal water of Tongwei and Qingshui was higher TDS (915-1793 mg / L) SO4 with lower pH (7.1 ~ 8.07). The hydrochemical characteristics of geothermal water were mainly influenced by different surrounding rock and With the degree of rock interaction under the control. The δD and δ18O values of geothermal water indicate that geothermal water originates from atmospheric precipitation and is not significantly affected by water-rock isotope exchange. Comprehensive application of a variety of geothermal temperature scale, geothermal water is estimated heat storage temperature of 70 ~ 111 ℃, belonging to low-temperature geothermal resources. For the annual average rainfall of about 500 mm in Tianshui and its northern and southern regions, the utilization of geothermal water should be taken alternately.