贵州省赫章地区典型地热水水文地球化学特征及成因  

Hydrogeochemical Characteristics and Origin of Typical Geothermal Waters in Hezhang,Guizhou Province

作　　者：张小强 孙平明 赵亚云 郭敏 卫永华 洪超 Zhang Xiaoqiang;Sun Pingming;Zhao Yayun;Guo Min;Wei Yonghua;Hong Chao(NO.7 Geological Party,Non-ferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou,Guiyang 550005,Guizhou,China;NO.2 Geological Team,Tibet Autonomous Region Geological Mining Exploration and Development Bureau,Lhasa 850003,Xizang,China;NO.3 YYangbi County Bureau of Natural Resources,Dali 671000,Yunnan,China)

机构地区：[1]贵州省有色金属和核工业地质勘查局七总队,贵州贵阳550005 [2]西藏自治区地质矿产勘查开发局第二地质大队,西藏拉萨850003 [3]云南省漾濞县自然资源局,云南大理671000

出　　处：《陕西地质》2024年第2期95-106,共12页Geology of Shaanxi

摘　　要：本文以成功实施的六曲河、后河2口地热井为研究对象,在充分分析地热地质、水化学特征基础上,阐述了研究区地热水的起源、变质特征,水-岩平衡状态,并计算了储层温度和地热流体热循环深度等。结果表明:研究区水化学类型均为SO4·HCO3-Ca·Ma型,水-岩作用均未达到平衡,均为混合起源水,其中六曲河地热水主要来源于大气降水,属初期变质水,后河地热水主要来源于原热储层地热流体,属中度变质水,同时也反映出区内热储层水体环境较开放和后河热储层水体环境较六曲河封闭、冷水混合比例低、流动缓慢、滞留时间长、热储层水流动力条件差的特点。研究区NE向、近EW向断裂构造是区内主要导热导水通道,区内具有开发利用价值地下热水主要储集于第一热储层和第二热储层,前者热储层温度为115~115.3℃,平均循环深度为3600m,后者热储层温度为113.8~115.5℃,平均循环深度为3100m。通过本次研究,填补了赫章地区地下热水水文地球化学特征和成因研究空白,对本区和黔西北地区地下热水资源勘查、开发利用和保护具有十分重要的意义。This study concentrates on the successful implementation of two geothermal wells,Liuqu River and Houhe,and provides an in-depth analysis of the geothermal geology and hydrochemical characteristics of the region.The study examines the origin,metamorphic characteristics,and water-rock equilibrium state of the geothermal waters,as well as calculating the reservoir temperatures and depths of geothermal fluid circulation.The results demonstrate that the water chemistry in the study area is of the SO_(4)·HCO_(3)-Ca·Ma type,indicating that water-rock interactions have not reached equilibrium.Additionally,the waters are of mixed origin.The Liuqu River geothermal water is primarily sourced from atmospheric precipitation and is classified as early-stage metamorphic water.In contrast,the Houhe geothermal water is derived predominantly from the original geothermal fluids within the reservoir and is classified as moderately metamorphic water.Furthermore,the study demonstrates that the geothermal reservoirs in the region possess an open system environment,with the Houhe reservoir exhibiting a comparatively closed system compared to the Liuqu River reservoir.The Houhe reservoir displays a lower degree of cold water mixing,a slower flow rate,a longer residence time,and inferior hydrodynamic conditions.The NE-and near-EW-trending fault structures serve as the primary conduits for heat and water flow within the region.The geothermal waters with significant development potential are primarily stored in the first and second geothermal reservoirs.The temperature range of the first reservoir is 115-115.3℃,with an average circulation depth of 3600 meters,while the second reservoir has a temperature range of 113.8-115.5℃ and an average circulation depth of 3100 meters.This study addresses a significant knowledge gap regarding the hydrogeochemical characteristics and genesis of underground thermal waters in the Hezhang region.It offers invaluable insights that will inform the exploration,development,and protection of geothermal res

关 键 词：地下热水 地热地质 水化学特征 成因 赫章地区 

分 类 号：P641.3[天文地球—地质矿产勘探]