邯邢东部平原馆陶组地下热水化学特征及成因分析

Hydrochemical Characteristics and Formation of Geothermal Water in Guantao Formation of Eastern Hanxing Plain

邯邢东部平原蕴藏着丰富的中低温地热资源,以馆陶组热储为主。但长期以来人们对该地区的地热资源研究程度较低,相关认识不足。运用水文地球化学研究手段,对邯邢东部平原地下热水的水化学特征、物源机制、热储特征进行分析。结果表明:邯邢东部平原馆陶组地下热水化学类型主要为Cl-Na型和HCO_(3)-Na型,微量元素含量较高,具有理疗保健的功效;其馆陶组热储变质程度较低,热储环境较为开放;大气降水是其主要的补给来源,由于地下热水对周围岩体的长期溶滤并经历了一系列的水—岩反应,形成了pH呈弱碱性的微咸水—咸水;运用了多种地热地球化学温度计分析认为邯邢东部平原深部热储温度为67℃~89℃。此次研究可为邯邢地区地下热水研究及地热资源的合理开发利用提供数据支撑。

The eastern plain of Hanxing is rich in medium and low temperature geothermal resources,mainly the heat storage of Guantao Formation.However,for a long time,the degree of research on geothermal resources in this region is low,and the relevant understanding is insufficient.In this paper,hydrogeochemical research means are used to analyze the hydrochemical characteristics,provenance mechanism,and heat storage characteristics of the Handan and Xingtai plain geothermal water.The results showed that the hydrochemical types of the geothermal water in the east plain of Hanxing were mainly Cl-Na and HCO_(3)-Na,and the contents of trace elements were relatively high,which had the effect of physiotherapy.The Guantao formation has a low degree of thermal reservoir metamorphism and an open thermal reservoir environment;meteoric water is the main source of replenishment.Due to the long-term dissolution and filtration of underground hot water to the surrounding rock mass and a series of water-rock reactions,brackish water with weak pH is formed;using a variety of geothermal geochemical thermometers,it is considered that the deep heat storage temperature in the eastern plain of Hanxing is 67℃~89℃.This study can provide data support for the study of geothermal fluid and the rational development and utilization of geothermal resources in Hanxing area.