江苏省地热水水化学特征研究

Study on Hydrochemical Characteristics of Geothermal Water in Jiangsu Province

江苏省地处我国东部沿海,为我国经济最发达的地区之一,地热水资源较为丰富,地热水资源开发前景广阔,科学的开发利用好地热水资源对缓解能源压力、节能减排、保护生态环境,促进江苏低碳经济的发展具有十分重要的意义[1]。本文对江苏省178口地热井与温泉基本情况进行调查,并收集大量资料进行计算分析,对全省热储分布特征,微量元素的分布与区域地质背景之间关系以及其受水岩相互作用等条件的影响进行研究。结果表明,江苏省可按构造及地层特征划分为四大地热资源区,区内地热化学类型主要为HCO_3-Na、Cl-Ca、Cl-Na、SO_4-Ca、SO_4-Na,地热水的矿化度范围为297~2 1087 mg/L,pH值范围为6.59~9.17。地热水微量元素以氟化物、锶、偏硼酸、偏硅酸四种微量元素为主,主要富集在40℃~60℃的地热水之中。该研究结果对江苏省地热水长期研究及开发利用提供参考。

Jiangsu Province is located in the eastern coastal area of China,which is one of the most economically developed areas in China. The geothermal water resources are abundant,and the development prospect is broad. Scientific development and utilization of geothermal water resources is of great significance to alleviate energy pressure,save energy and reduce emissions,protect the ecological environment and promote the development of low-carbon economy in Jiangsu. In this paper,the survey of 178 geothermal wells and hot springs in Jiangsu Province are carried out,and a large amount of data is collected for analysis. Also,the characteristics of the distribution of thermal storage in this province,the relationship between the distribution of trace elements and the regional geological background and the influence of water-rock interaction are studied. The results show that Jiangsu Province can be divided into four geothermal resource zones according to the characteristics of structure and stratum. The geothermal chemical types in the area are mainly HCO3-Na,Cl-Ca,Cl-Na,SO4-Ca and SO4-Na,the geochemical degree of geothermal water is 297 - 21 087 mg/L,pH value is 6. 59 - 9. 17. The trace elements of geothermal water are mainly composed of four kinds,listed as fluoride,strontium,metaboric acid and metasilicic acid,which are mainly enriched in geothermal water of 40 ℃ - 60 ℃. The results of this study provide a reference for the long-term research and development of geothermal water in Jiangsu Province.