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海南岛东海岸官塘地区地热水水化学特征及其循环演化过程识别
张彦鹏, 黎清华, 余绍文
PDF(4251 KB)
PDF(4251 KB)
海南岛东海岸官塘地区地热水水化学特征及其循环演化过程识别
Hydrochemical Characteristics Constraints on Evolution of Geothermal Water in Guantang Area on the East Coast of Hainan Island
地热水资源的形成与演化过程认识是区域地热资源科学合理开发利用的重要基础.运用水化学及同位素分析方法，结合区域地质构造特征，系统揭示了海南东海岸官塘地区地热水水化学特征、地热储温度以及补给来源，构建了官塘地区地热水循环演化概念模型.研究结果表明：该区地热水水化学类型主要为HCO3·SO4-Na型，其组分主要来源于硅酸盐矿物溶解及深部CO2等气体；地热水主要受到大气降水补给，补给海拔约为1 122.2~1 569.4 m，并且地热水上升过程中与浅部地下水之间存在较为显著的混合作用.在考虑混合和蒸汽损失的条件下，深部地热水与冷水混合前蒸汽损失的质量百分比约为18.2%~25.2%，地热水温度为190.4~217.8 ℃，冷水混合比例可达到66.8%~80.8%.该地区地热水开发程度逐年提高，导致地热水水位大幅下降，使得浅部冷水补给量增大，这可能是造成该地区开采地热水温度下降的关键影响因素.
The understanding of the formation and evolution of geothermal water is an important basis for the scientific and rational utilization of regional geothermal resources. In this paper, the hydrochemical characteristics, geothermal storage temperature and recharge source of geothermal water in Guantang area on the east coast of Hainan were systematically revealed by using hydrochemical and isotopic analysis methods combined with regional geological structure characteristics, and a conceptual model of geothermal water cycle evolution in Guantang area was constructed. The results show that the hydrochemistry of geothermal water was mainly HCO3·SO4-Na type, and its components mainly came from silicate mineral dissolution and deep gas components. Geothermal water was mainly originated from meteoric precipitation, and the recharge area was most likely located at the altitude of 1 122.2-1 569.4 m. There was a significant mixing effect between geothermal water and shallow groundwater. Under the condition of steam loss before mixing, the mass percentage of steam loss from geothermal water was 18.2%-25.2%, and the initial temperature of geothermal water was 190.4-217.8 ℃, and the mass percentage of cold water mixing to geothermal water was 66.8%-80.8%. The geothermal water level decreased greatly with the increasing geothermal water exploration in this area in recent decades, so the increase of shallow groundwater supply may be the crucial process resulting in the decrease of geothermal water temperature in this area.
官塘地热田 / 地热水资源 / 水文地球化学 / 地热水补给来源 / 热储温度 / 水文地质
Guantang geothermal field / geothermal water resources / hydrogeochemistry / geothermal water recharge / geothermal storage temperature / hydrogeology
P641.3
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