北京地区地热流体质量评价

Geothermal Fluid Quality Evaluation in Beijing

地热流体的质量决定了其使用方向,以往地热流体质量评价主要为单井评价或局部区域评价。本文首次利用140件地热水化学资料开展全区地热流体质量评价,主要包括医疗热矿水质量评价、渔业用水水质评价、农业浇灌用水水质评价及地热流体腐蚀(侵蚀)性及结垢趋势评价。评价结果显示,北京市地热水绝大部分地热水中含有氟且达到命名浓度,多数含有偏硅酸且达到医疗价值,有的达到命名浓度。北京市只有1/4左右到的地热井可进行渔业直接用水;根据钠吸附比进行评价,88.6%地热水不适于农业浇灌直接用水;北京地区的地热水中导致腐蚀的因素是比较弱的,结垢趋势也相对较弱。

The quality of the geothermal fluid determines its utilization direction. In the past, the quality of geothermal fuid was mainly evaluated by single well evaluation or local evaluation. In this research, it is frst to use the water chemistry data of 140 samples to carry out the quality evaluation of geothermal fuid, and it mainly includes the quality evaluation of medical hot mineral water, fishery water, agricultural irrigation water, and corrosion geothermal water. The results show that the majority of geothermal water in Beijing contains fuoride and its content reaches the level to determine the names. Most water contains metasilicate and some has the medicinal value. Only about 1/4 of geothermal water in Beijing can be used directly for fsheries. According to evaluate the sodium adsorption ration, 88.6% geothermal water is not suitable for agricultural irrigation. The corrosion factors of geothermal water in Beijing area are relatively weak, and the scaling trend is relatively weak.