苏南现代化建设示范区现今地温场特征及影响因素  

Current Geothermal Field of the South Jiangsu Modernization Demonstrative Area and Its Influencing Factors

作　　者：杨露梅[1,2] 邝荣禧 郭慧 左丽琼 苟富刚[1,2] 许书刚 张硕[1,2] YANG Lumei;KUANG Rongxi;GUO Hui;ZUO Liqiong;GOU Fugang;XU Shugang;ZHANG Shuo(Geological Survey of Jiangsu Province,Nanjing,Jiangsu 210018,China;Key Laboratory of Earth Fissures Geological Disaster,Ministry of Natural Resources,Nanjing,Jiangsu 210018,China)

机构地区：[1]江苏省地质调查研究院,江苏南京210018 [2]自然资源部地裂缝地质灾害重点实验室,江苏南京210018

出　　处：《现代地质》2023年第4期954-962,共9页Geoscience

基　　金：省部合作项目“苏南现代化建设示范区综合地质调查”(12120115043201)。

摘　　要：苏南现代化建设示范区隶属于下扬子陆块,区内主要包含有苏北坳陷、中部隆起、苏南坳陷、南通—太湖隆起等构造单元。通过分析该区39口地热井测温数据并结合前人的研究成果,对研究区地温梯度、深部地温和大地热流分布特征进行剖析,并分析地温场的主要影响因素包括地质构造、岩石热导率、盖层厚度和火山岩体。结果表明苏南地区地温梯度范围为14.9~26.5℃/km,平均值为21.3℃/km,大地热流值介于51.0~73.5 mW/m^(2)之间,平均值为64.2 mW/m^(2);研究区地温梯度、深部地温和大地热流分布均表现出凹凸分布的特征,隆起区高于坳陷区,钻孔存在地温梯度分段现象,热导率高的地层地温梯度较热导率低的地层小。The South Jiangsu Modernization Demonstrative Area belongs to the Lower Yangtze region.The study area includes mainly four lower-order structural units:the Northern Jiangsu Depression,the Central Uplift,the Southern Jiangsu Depression,and the Nantong-Taihu Uplift.Distribution characteristics of the local geothermal gradient,the deep ground temperature and the terrestrial heat flow were analyzed based on the temperature data of 39 geothermal wells and previous published data.The results show that the present geothermal gradient ranges from 14.9 to 26.5℃/km(average 21.3℃/km).The present terrestrial heat flow values range from 51.0 to 73.5 mW/m^(2)(average 64.2 mW/m^(2)).Factors affecting the present geothermal field were further explored,including geological structure,thermal conductivity,caprock thickness and volcanic body.The depression area has lower geothermal gradient than the uplift area,and the deep ground temperature and the terrestrial heat flow exhibit the same characteristics.Vertically,the geothermal system is characterized by segmentation.Geothermal gradient of the strata with high thermal conductivity is smaller than that of the strata with low thermal conductivity.

关 键 词：苏南现代化建设示范区 现今地温场 地温梯度 大地热流 热导率 

分 类 号：P314.2[天文地球—固体地球物理学]