华南陆缘火成岩区差异性地壳热结构及地热意义
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本文为科技部重点研发计划课题(编号2021YFB1507401)和国家自然科学基金项目(编号41874100)联合资助的成果


Differential crustal thermal structure and geothermal significance in the igneous region of southeastern China
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  • LIN Wenjing

    LIN Wenjing

    1) Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang, Hebei 050061, China;2) Technical Innovation Center for Geothermal and HDR Exploration and Development, Ministry of Natural Resources, Shijiazhuang, Hebei 050061, China
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  • WANG Guiling

    WANG Guiling

    1) Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang, Hebei 050061, China;2) Technical Innovation Center for Geothermal and HDR Exploration and Development, Ministry of Natural Resources, Shijiazhuang, Hebei 050061, China
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  • GAN Haonan

    GAN Haonan

    1) Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang, Hebei 050061, China;2) Technical Innovation Center for Geothermal and HDR Exploration and Development, Ministry of Natural Resources, Shijiazhuang, Hebei 050061, China
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    摘要:

    高产热花岗岩是重要的壳内热源之一,我国华南陆缘花岗岩体分布广泛,为该区浅表热量的生成及聚集提供了可能。本文在简述区内花岗岩资源分布的基础上,系统分析了区内主要花岗岩体的放射性生热特征,并结合区内近些年施工的地热勘探深钻,对重点地热勘查区的深部地温场分布、地热通量、地壳热结构等进行了对比分析,提出了华南陆缘浅表地热资源的聚热模式。分析认为,华南陆缘地区具有“幔源供热壳内生热断裂传热盖层保热”的四元聚热模式,其中,花岗岩体的放射性生热率是影响区内浅部地温场的主要因素之一,粤北—赣南岩体的生热率明显高于漳州地区的花岗岩体,其近似“热壳冷幔”型或“温壳温幔”型岩石圈热结构与漳州“热幔冷壳”型岩石圈热结构有一定的差异;断裂构造及盖层条件对于地下热量聚集及散失具有明显的控制作用。研究成果对于深入理解华南陆缘地热资源的成因、控热因素,以及今后该地区地热资源勘探开发实践具有一定的理论与指导意义。

    Abstract:

    High heat- producing granite is one of the important intracrustal heat sources is widely distributed in the southeastern China, which provides the possibility of superficial heat generation and accumulation in the region. Based on the distribution of granite resources in the region, this paper systematically analyzes the radiogenic heat production characteristics of the main granite bodies in the region, and makes a comparative analysis of the deep temperature distribution, geothermal heat flux and crustal heat structure in the key geothermal exploration areas with the deep drilling of geothermal exploration in the region in recent years, and proposes a heat gathering model of shallow surface geothermal resources in the study area. The analysis concluded that the southeastern China has a quadratic heat gathering pattern of “mantle source heat supply- intracrustal heat generation- fracture heat transfer- cover heat preservation”, among which, the radiogenic heat production rate of granite is one of the main factors affecting the shallow geothermal field in the area. The heat production rate of the North Guangdong- South Jiangxi rock body is obviously higher than that of the granite body in Zhangzhou area, which in turn is similar to the thermal structure of lithosphere of “hot crust- cold mantle” or “warm crust- warm mantle” type but has some differences with that of “hot mantle- cold crust” type in Zhangzhou. The fracture structure and cover conditions have obvious control on subsurface heat accumulation and dissipation. The results of the study are of theoretical and guiding significance for the in- depth understanding of the genesis and heat control factors of geothermal resources in southeastern China, as well as the future exploration and development practice of geothermal resources in the region.

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蔺文静,王贵玲,甘浩男.2024.华南陆缘火成岩区差异性地壳热结构及地热意义[J].地质学报,98(2):544-557.
LIN Wenjing, WANG Guiling, GAN Haonan.2024. Differential crustal thermal structure and geothermal significance in the igneous region of southeastern China[J]. Acta Geologica Sinica,98(2):544-557.

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历史
  • 收稿日期:2022-07-10
  • 最后修改日期:2022-08-09
  • 录用日期:2022-08-11
  • 在线发布日期: 2024-01-31