| 广西干热型地热资源成因机制与赋存模式 |
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| 引用本文： | 孙明行,张起钻,刘德民,孙兴庭,林珊,吴祥珂,梁国科,李玉坤,管彦武,李叶飞.广西干热型地热资源成因机制与赋存模式[J].地质科技通报,2022,41(3):330-340. |
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| 作者姓名： | 孙明行 张起钻 刘德民 孙兴庭 林珊 吴祥珂 梁国科 李玉坤 管彦武 李叶飞 |
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| 基金项目： | 广西关键矿产资源深部勘查人才小高地项目桂组通字[2019]85号广西关键矿产资源深部勘查人才小高地项目2019-2023年广西合浦盆地干热型地热资源调查项目桂地矿地[2021]23号中国地质调查局项目"海南昌江-广东云浮地区区域地质调查"DD20190047 |
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| 摘 要： | 干热岩(HDR)作为一种清洁、可再生的地热资源，所蕴含的地热能潜力巨大，极具开发前景和研究价值。为了向干热型地热资源生成理论研究及赋存条件分析提供案例，向干热岩成因机制、赋存模式的系统性总结贡献广西经验，选取地热资源丰富的钦州、合浦盆地为研究对象，采用区域地质调查、热物性测定、放射性元素测量、地热地球化学和地球物理勘查等综合性研究方法，对两个干热型地热资源潜力区的热源机制、运移和聚热模式进行了系统总结，即在有限的地质、地热井、热物性和大地电磁测深(MT)资料的约束下，初步建立密度、磁性、电性参数与基础地质认识有机统一的地质—地球物理模型和干热型地热资源赋存模型。结果表明:在地球内热的生成、演化理论制约下，钦州盆地以壳、幔物质上涌所形成的传导型热为主要热源，归属于强烈构造活动带—沉积盆地型干热型地热资源区；合浦盆地以“低速高导”局部熔融层为主要热源，以次级幔枝或热点为热源补给，归属于近代火山—沉积盆地型干热型地热资源区。研究结果为干热型地热资源的勘查提供了理论依据，对广西干热型地热资源潜力区的对比性研究和精细化评价具有示范性意义。
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| 关 键 词： | 广西 干热型地热资源 成因机制 赋存模式 |
| 收稿时间： | 2021-06-21 |
Genesis and occurrence models of hot-dry geothermal resources in Guangxi |
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| Abstract: | As a kind of clean and renewable geothermal resource, dry hot rock (HDR) contains a huge potential for geothermal energy, which is of great development prospect and research value. To provide cases for the theoretical study on the generation and the analysis of occurrence conditions of dry-hot geothermal resources, and contribute the experience of Guangxi to the systematic summary of the genesis and occurrence models of HDR, this article selects Qinzhou and Hepu basins, which contain rich geothermal resources, as the research objects, using regional geological survey, thermophysical determination, radioactive element measurement, geothermal geochemistry, geophysical exploration and other comprehensive research methods, systematically summary the heat source mechanism, migration and heat accumulation model of two potential dry heat geothermal resource regions. Under the constraint of limited geological, geothermal well, thermophysical property, and magnetotelluric sounding(MT)data, establish an organic and unified geology-geophysics model of density, magnetism, electrical property parameters, and basic geological knowledge, an occurrence model of dry hot geothermal resources. The results suggest that under the restriction of the generation and evolution of the earth′s internal heat, Qinzhou Basin is classified as an active tectonic belt - sedimentary basin type of HDR resources area, which regards crust-mantle upwelling material as the main heat source; Hepu Basin is classified as the modern volcano-sedimentary basin type of HDR resources area, which regards local molten layer as the main heat source with the "low speed and high resistance" and secondary mantle branch / hot spot as the supply heat source. The research results provide a theoretical basis for the exploration of dry-hot geothermal resources and have demonstrative significance for the comparative study and fine evaluation of dry-hot geothermal resource potential areas in Guangxi. |
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