摘要
为查明龙沐湾地热田的地温场、水化学及补给来源等特征,分析地热田成因模式。利用水文地球化学、同位素及地温测量等方法,结合区域地质特征,系统分析龙沐湾地热田水化学特征、热储温度、补给来源,初步构建龙沐湾地热田成因概念模型。结果表明:龙沐湾地热田孔隙型层状热储地温梯度5.23~8.25℃/100 m,裂隙型带状热储地温梯度1.47~4.50℃/100 m,深部热储温度87~115℃,地热流体循环深度可达960~2298 m。地热流体水化学类型为HCO_(3)-Na·Ca和Cl·HCO_(3)-Na型,主要补给来源为大气降水,计算补给高程为421~597 m,推断补给区域为尖峰岭腹地。同位素年龄结果表明:地热水形成年龄超过6000 a,具有补给路径长、径流缓慢的特点。
In order to identify the characteristics of the geothermal field in Longmuwan,including its temperature field,hydrochemistry,and recharge sources,and to analyse its genetic model.The hydrogeochemistry,isotopes,and geothermal temperature measurement methods were employed,integrated with regional geological characteristics,the hydrochemical characteristics,heat reservoir temperature and recharge sources of the geothermal field were systematically analysed,and a conceptual genetic model was preliminarily constructed.The results indicate that the geothermal gradient of porous stratified reservoir is 5.23~8.25℃/100 m,while the fracture zoned reservoir has a gradient of 1.47~4.50℃/100 m,the deep heat reservoir temperature range is 87~115℃,with geothermal fluid circulation depths reaching 960~2298 m in Longmuwan geothermal field.The hydrochemical types of geothermal fluid are HCO_(3)-Na·Ca type and Cl·HCO_(3)-Na type,primarily recharged by atmospheric precipitation.The calculated recharge elevation is 421~597 m,suggesting the recharge area is the hinterland of Jianfeng Ridge.Isotopic age results show that the formation age of geothermal water exceeds 6000 a,and it has the characteristics of a long recharge pathway and slow groundwater flow.
作者
王晓林
杨永鹏
杨峰
柳长柱
李信
黄照杰
WANG Xiao-lin;YANG Yong-peng;YANG Feng;LIU Chang-zhu;LI Xin;HUANG Zhao-jie(Hainan Key Laboratory of Marine Geological Resources and Environment,Haikou 570206,China;Hainan Geological Survey Institute,Haikou 570206,China;Hainan Ecological Environment Geological Survey Institute,Haikou 570206,China)
出处
《科学技术与工程》
北大核心
2025年第20期8371-8378,共8页
Science Technology and Engineering
基金
海南省海洋地质资源与环境重点实验室课题(23-HNHYDZZYHJZZ007)
原海南省国土资源厅项目(HNZC15-023-002H)。
关键词
地热田
地温梯度
同位素
地热温标
龙沐湾
海南
geothermal field
geothermal gradient
isotopes
geothermometer
Longmuwan
Hainan
