摘要
中国大陆蕴藏丰富的地热资源,山西省局部地热异常特征明显。通过收集山西省典型地热区域流体数据,选取典型钻孔分析,探讨并总结山西省地热资源赋存规律和成因机制,为后期地热资源勘探及开发利用提供重要参考依据。通过分析研究结果得出以下几点认识:山西省水热型地热储层水温分布在28~78℃,北部以太古代花岗片麻岩为主,中部以古生代灰岩为主,南部以古生代碳酸盐岩为主;北部热源主要来自花岗岩中放射性元素衰变产生热量,中部和南部热源受地幔上隆及岩浆活动影响;省内深大断裂构成地下热水运移通道,热传导性较好;第四纪和第三纪松散层为省内地热良好的保温盖层,岩性以粘土、砂质粘土及砂层为主。结合前人水文地球化学研究成果,认为山西省地热水pH值呈弱碱性,其中Sr、Li、SiO_(2)与Cl大体上存在正相关关系,大部分地热水氚含量小于1TU,水源主要为大气降水补给,部分地热田出现δ^(18)O漂移,氧同位素交换作用显著。
The Mainland of China is rich in geothermal resources,and Shanxi Province possesses obvious geothermal anomalies.This work collected the fluid data of typical geothermal regions in Shanxi Province and selected typical boreholes for analysis.The occurrence law and mechanism of geothermal resources in Shanxi Province were discussed and summarized,which will provide an important reference for the exploration,development and utilization of geothermal resources in the later stage.Results indicate that the water temperature of hydrothermal geothermal reservoirs in Shanxi Province ranges from 28℃to 78℃.Archaean granite gneiss,Paleozoic limestone and Paleozoic carbonate are the main heat reservoirs in the north,middle and south area of Shanxi Province.The heat source in the north is mainly from the decay of radioactive elements in the granite.However,the heat source in the central and southern regions is affected by mantle uplift and magmatic activity.The deep and large faults constitute the main hot water migration channels with high thermal conductivity.The Quaternary and Tertiary loose sedimentary layers are good thermal insulation covers,mainly including clay,sandy clay and sand layer.Combined with previous geochemical research results,it is concluded that the pH value of geothermal water in Shanxi Province is weakly alkaline.Sr,Li,SiO_(2)and Cl are generally positively correlated.The content of 3H in most geothermal water is less than 1TU.Water source mainly comes from precipitation recharge.δ^(18)O drift occurs in some geothermal fields,and the exchange of oxygen isotope is significant.
作者
李壮
冯志强
侯建斌
郭亮亮
何俊辰
王权
郝书清
邓玉龙
LI Zhuang;FENG Zhiqiang;HOU Jianbin;GUO Liangliang;HE Junchen;WANG Quan;HAO Shuqing;DENG Yulong(Department of Earth Science and Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024;Shanxi Huaye Metallurgical Engineering Technology Co.,LTD,Taiyuan,Shanxi 030002;College of Water Resources Science and Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024;Shanxi No.3 Institute of Geological Engineering Investigation Co.,LTD,Taiyuan,Shanxi 030320;Shanxi Institute of Geological Survey Co.,LTD,Taiyuan,Shanxi 030006)
出处
《地质与勘探》
CAS
CSCD
北大核心
2023年第2期353-376,共24页
Geology and Exploration
基金
山西省自然科学基金面上项目(编号:202103021224012、2019L0126和2019L0054)
山西省自然资源厅地勘基金项目-山西省地热资源开发利用现状调查及潜力分析项目(编号:2019-12)联合资助。
关键词
山西省
地热
热源
断裂
通道
热储
盖层
水源
Shanxi Province
geothermal resource
heat source
fault
channel
heat storage
caprock
water source
