干热岩地热资源热源机制研究现状及其对成因机制研究的启示

Research status of heat source mechanism of the hot dry rock geothermal resources and its implications to the studies of genetic mechanism

干热岩作为一种清洁可再生能源具有巨大的开发利用价值,大力开发干热岩可助力我国实现“碳达峰”与“碳中和”目标.成因机制研究是干热岩地热资源高效开发利用的基础.在干热岩地热资源形成中,热源是首要控制因素.本文通过全面梳理全球典型干热岩示范场地的地热地质背景与热源机制研究现状,对常见的干热岩热源机制进行了分类归纳,并在此基础上,分析了我国未来干热岩成因机制研究的方向.研究结果表明,花岗岩放射性生热、附加岩浆热与深部地幔热是干热岩常见的热源,其中,附加岩浆热源又可进一步根据成因分为火山岩浆热源与构造岩浆热源.本论文认为在未来干热岩成因机制研究中,应高度重视热源构成及各热源热贡献量的量化表征,在此基础上,重点查明浅部控热构造,构建干热岩地热资源的“生热-控热”一体化定量模型.此外,进一步完善大地热流数据也有助于干热岩地热资源成因机制的深入研究.

Hot Dry Rock(HDR),as a kind of clean and renewable energy,has great value of development and utilization,and can help to achieve the goal of carbon peak and carbon neutralization.The researches on the genesis mechanism are the basis for the efficient development and utilization of the HDR resources.During the formation of the HDR resources,the heat source is the primary controlling factor.Thus,based on the comprehensively analysis of the geothermal geological background and heat source mechanism of typical HDR demonstration sites around the world,the common heat source mechanisms are summarized in this paper,and consequently the future directions of the researches of the genesis mechanism of the HDR are analyzed.The results show that the radioactive source of the granite,additional magma heat source as well as the heat from the deep mantle are the most commonly candidates.Among them,the additional magma heat source can be further divided into the volcanic magma and tectonic magma heat sources based on their genesis.This paper believes that in the future research,the great attention should be paid to figure out the composition of heat sources and the quantitative heat contribution of each heat source bodies.On the basis of above,the focus should be on the identification of the shallow heat-controlling structures,as well as the construction of the integrated quantitative model of“heat generation-heat control”of the HDR resources.In addition,the further improvement of the terrestrial heat flow will also contribute to the in-depth researches on the genesis mechanism of the HDR resources.