地学前缘 ›› 2020, Vol. 27 ›› Issue (1): 10-16.DOI: 10.13745/j.esf.2020.1.2

• 地热资源形成与分布 • 上一篇    下一篇

试论地球深部地热能传输机理

罗文行,孙国强,周洋,刘德民,陈棋   

  1. 1. 长江勘测规划设计研究有限责任公司, 湖北 武汉 430010
    2. 长江三峡勘测研究院有限公司(武汉), 湖北 武汉 430074
    3. 中国地质大学(武汉), 湖北 武汉 430074
  • 收稿日期:2019-04-21 修回日期:2019-09-28 出版日期:2020-01-20 发布日期:2020-01-20
  • 作者简介:罗文行(1983—),男,高级工程师,主要从事构造地质与深层地热开发利用研究。E-mail:luo_wenxing@qq.com
  • 基金资助:

    企业自主研发项目“深层地热能热源机制与勘查技术组合优化研究”(CX2017Z29);广西干热岩选区预测与分级评价(2019016110)

Discussion on the mechanism of deep geothermal energy transmission

LUO Wenxing,SUN Guoqiang,ZHOU Yang,LIU Demin,CHEN Qi   

  1. 1. Changjiang Survey, Planning, Design and Research Co., Ltd., Wuhan 430010, China
    2. Three Gorges Geotechnical Consultants Co., Ltd.(Wuhan), Wuhan 430074, China
    3. China University of Geosciences (Wuhan), Wuhan 430074, China
  • Received:2019-04-21 Revised:2019-09-28 Online:2020-01-20 Published:2020-01-20

摘要:

本文在对前人地热成因认识归纳检验的基础上,通过演绎推理的方法,从几条基本的物理定律和基本假设组成的第一性原理出发,推理“地球内部热能从深部向浅表传输”的动力学过程,探讨深层地热能热源机制。热源机制问题从物理学的角度看,本质上就是热能从地球内部向近地表传输的问题。可以根据第一性原理,通过演绎法推理其可能的传输过程。深层热能传输的第一性原理由“温度的定义、热胀冷缩原理、阿基米德原理、热力学第二定律以及辐射、传导和对流三种热量传输方式的效率对比”5条基本的概念和定理组成。结合地球已知的圈层结构,通过演绎推理可知,在固态内核偏移驱动下,液态外核开始流动,在局部聚集导致地幔中形成上升的地幔柱;地幔柱在另一个地球圈层界面发生顶托作用,使得界面上凸,并产生烘烤加热作用,被烘烤的上层物质流变性增强发生侧向流动,于是物质垂直运动转换为水平运动。水平流动的热物质聚集到一定程度又会上浮产生垂直运动。如此垂直运动和水平运动不断转换,最终将地球深部地核中的热能传输到了地壳浅层。地球深部热能向浅表传输的过程会导致海底增生扩张、板块运动、盆山耦合等,同时也形成不同级别的控热构造系统。地球尺度的控热构造系统为:地球内核为生热构造,液态外核为储热构造,各级地幔柱和流动的高温物质为导热构造,地表的火山、温泉、地震为释热构造子系统。大陆地壳准固态流变物质的侧向流动是干热岩形成的主控因子,对于干热岩地热能勘查具有重要意义。

关键词: 深层地热, 热传输机制, 演绎推理, 第一性原理, 干热岩

Abstract:

Based on deductive testing of previous mechanistic models of geothermal energy generation, we deduced the dynamic process of “internal heat transfer from the deep to the shallow surface of the earth”. We also discussed the mechanism of deep geothermal energy transmission from a few basic laws (first principles) through deductive reasoning. From a physical perspective, geothermal energy is essentially the result of thermal energy transfer from the Earth’s interior to the shallow crust. According to the first principle, the possible transmission process can be inferred by deductive method. The first principle of deep thermal energy transmission consists of five basic concepts: definition of temperature, principle of thermal expansion and contraction, Archimedes principle, thermal radiation and second law of thermodynamics and comparative efficiencies of three heat transfer modes of conduction and convection. Combined with the known Earth’s spherical structure, it can be seen from deductive reasoning that the liquid outer core begins to flow under the migration of the solid inner core, resulting in upwelling of mantle plume due to local fluid aggregation. The mantle plume occurs at the interface of another earth sphere, where the uplift force of underplating creates a convex geometry and produces a baking heating effect. As a result, the rheological property of the baked upper materials is enhanced to cause lateral flow, so that the vertical movement of the substance is converted into horizontal motion. The horizontally flowing hot matter accumulates to a certain extent and rises upward to produce vertical motion. Such vertical and horizontal movements are constantly changing, eventually transferring thermal energy from the center of the Earth’s deep core to the shallow crust. This energy transfer can lead to seafloor expansion, plate movement, basinmountain coupling, etc., and also form different levels of heatcontrol structure systems. The earthscale thermostatic tectonic system may be divided into several subsystems: the Earth’s core that is a heatgenerating structure; the liquid outer core that is a heat storage structure; mantle plums and high temperature fluids occurring at each sphere constitute the heatconducting structures; and volcanoes, hot springs and earthquakes on the Earth’s surface form the heatdissipating structures. The lateral flow of quasisolid rheological materials in continental crust is the main controlling factor for the formation of dry hot rock, which is of great significance for geothermal exploration of dry hot rock.

Key words:  deep geothermal energy, mechanism of heat transmission, deductive reasoning method, firstprinciples, hot dry rock

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