渤海湾周缘高温地热异常特征及深部热结构分析
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引用本文:张健,何雨蓓,姜程浩,褚伟,方桂.2023.渤海湾周缘高温地热异常特征及深部热结构分析[J].地球学报,44(1):57-69.
DOI:10.3975/cagsb.2022.092801
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作者单位E-mail
张健 中国科学院大学地球与行星科学学院 zhangjian@ucas.ac.cn 
何雨蓓 中国科学院大学地球与行星科学学院  
姜程浩 中国科学院大学地球与行星科学学院  
褚伟 中国科学院大学地球与行星科学学院  
方桂 中国科学院大学地球与行星科学学院  
基金项目:国家重点研发计划“变革性关键科学问题”重点专项(编号: 2021YFA0716002);国家自然科学基金项目(编号: 42176052);中国科学院战略性先导科技专项(编号: XDB42020104)
中文摘要:渤海湾周缘高温地热异常区是华北重要的地热资源区, 研究其浅层高温地热异常及深层高温地热结构, 是解决中国东部高温地热勘查开发瓶颈的重要基础, 对加快构建东部现代能源体系、推进“双碳”目标进程具有重要的科学意义。利用最新的中国大陆岩石圈速度模型USTClitho2.0和航磁资料, 在大地热流资料约束下, 本文计算了渤海湾周缘浅层与深层高温热结构, 结果表明: 该区居里面平均深度20.8 km, 居里温度420 ℃, 中、上地壳高温热结构与居里面起伏形态密切相关。上地壳生热率随深度增大而递减, 反映了放射性生热元素向上迁移、在浅层富集的垂向分异特征。Moho面温度在600~800 ℃之间, 岩石圈底界面1300 ℃等温面深度在66.3~97.5 km之间, 平均值为76.8 km。依据USTClitho2.0模型Vp、Vs速度结构, 本文修正了前人的地壳分层结构及上地壳生热率, 计算了研究区内全部91个大地热流点的壳幔热流比, 结果表明: Qc/Q=56.4%、Qm/Q=43.6%, Qc/Q>Qm/Q, 显示该区为“热壳”结构。前人认为此区是“冷壳热幔”型热结构, 本文的计算结果修正了前人的认识, 指出上地壳层热流在地表总热流中所占比例较高, 为该区寻找和发现中深层高温地热资源提供了重要依据。
中文关键词:渤海湾  地热异常区  深部高温地热资源  上地壳生热率  居里面  热壳结构
 
A Study of High Temperature Geothermal Anomaly and Deep Thermal Structure around Bohai Bay
Abstract:The high temperature geothermal anomaly area around Bohai Bay is an important geothermal resource area in North China. The study of shallow high-temperature geothermal anomaly and deep high-temperature geothermal structure in Bohai Bay is an important basis to solve the bottleneck of high-temperature geothermal exploration and development in eastern China, and has important practical significance for accelerating the construction of modern energy system in eastern China. Using the latest lithospheric velocity model of the Chinese mainland USTClitho2.0 and aeromagnetic data, we calculated the shallow and deep high-temperature thermal structure around the Bohai Bay. The results show that the average depth of Curie in this area is 20.8 km and the Curie temperature is 420 ℃. The high temperature thermal structure of the middle and upper crust is closely related to the undulating shape of the interior. The heat generation rate of the upper crust in this area decreases with the increased depth, which reflects the vertical differentiation characteristics of upward migration of radioactive heat generating elements. Moho temperature is between 600 and 800 ℃ in this area, and the depth of lithospheric bottom is between 66.3 and 97.5 km, with an average of 76.8 km. According to the velocity structures of USTClitho2.0, we modified the previous crustal stratification structure and upper crustal heat generation rate, and calculated the crust mantle heat flow ratio of all 91 terrestrial heat flow points in the study area. The results show that there is a“hot-crust” type thermal structure around the Bohai Bay. It was previously thought that this area is a “cold crust” type thermal structure. Our calculation results correct the previous understanding, and provide an important basis for the exploration and exploitation of high-temperature geothermal resources in the upper crust of this area.
keywords:Bohai Bay  geothermal anomaly area  deep high temperature geothermal resources  heat generation rate of upper crust  Curie point isotherm surface  thermal crustal structure
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