渭河盆地西部地热水水化学特征分析
Geothermal Water Hydrochemical Features Analysis in Western Part of Weihe Basin
宋一民,申小龙,王伟,刘军
摘要(Abstract):
地热水是一种绿色低碳、可循环利用的重要可再生资源。以我国西部渭河断陷盆地西端地区的清洁能源供暖中低温地热系统开发为研究基础,通过研究区域地热地质特征,采用水文地球化学测试与分析方法对施工的8口地热井的水化学特征进行了系统研究,并结合地热井温度流量等数据总结了研究区的地热水化学特征。研究发现:研究区地处盆地西部,在地质历史构造运动时期受多期构造运动影响,其断裂构造多为导水导热断裂,断层裂隙是研究区的主要热储层;利用Piper图等分析手段对地热水的化学基本特征进行了总结分析,研究区地热水矿化度平均值为752.35mg/L,属淡水,pH值平均值为8.30,弱碱性水,水化学类型主要是HCO_3–Na型,氟、偏硅酸,地热水为非腐蚀性水,结垢趋势为轻微-不结垢;利用K-Mg地热温标法对热储温度进行了估算,热储推算温度45.6~83.5℃。研究结果为我国西部渭河断陷盆地地热资源开发利用保护提供了参考依据。
关键词(KeyWords): 地热水;水化学特征;热储温度;地热温标
基金项目(Foundation):
作者(Author): 宋一民,申小龙,王伟,刘军
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