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地理科学  2011 

天水及其南北地区地热水水化学特征及起源

, PP. 668-673

Keywords: 天水及南北地区,水化学,同位素,地热温标

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Abstract:

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(226~255mg/L)HCO3型水,通渭和清水地热水为pH较低(7.1~8.07)的较高TDS(915~1793mg/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500mm的天水及其南北地区,应采取采、停交替的地热水利用方式。

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