Research on the genetic model and exploration progress of hot dry rock resources on the southeast coast of China
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摘要:
干热岩是一种重要的地热资源，绝大部分以开采地壳中生代以来中酸性侵入岩体中所蕴含的热量为主。东南沿海地区是中国最主要的高放射性花岗岩分布区，发育大面积的中生代酸性花岗岩体，是寻找干热岩的良好靶区。通过研究东南沿海大地构造背景、区域大地热流分布、地壳厚度、居里面埋深及新构造等条件，分析了东南沿海干热岩资源的赋存背景，对福建地区是否存在干热岩进行了探讨，并通过控热构造分析提出了东南沿海干热岩资源的成因模式，初步建立了东南沿海干热岩成藏的三元聚热模型，总结了漳州、惠州等地区的干热岩资源靶区勘查进展，相关研究为今后中国东南沿海地区干热岩勘查评价提供了基础。
Abstract:Hot dry rock (HDR) is an important geothermal resource, whose exploitation mostly centers on the heat contained in the intermediate-acid intrusive rock mass of the crust since the Mesozoic. The southeast coast is the main distribution area of highly radioactive granites in China, with a large area of developed Mesozoic acid granite intrusions, which makes it a target area for HDR prospecting. By studying the tectonic background of the southeast coast, regional terrestrial heat flow distribution, crustal thickness, buried depth of the curie surface and new structures, the occurrence background of HDR resources on the southeast coast and the existence of HDR resources in Fujian were analyzed and discussed. Based on the analysis of the heat-controlling structure, a genetic model of HDR resources on the southeast coast was proposed and a ternary heat accumulation model for HDR accumulation on the southeast coast was preliminary established. The exploration targeting at HDR resources in Zhangzhou, Huizhou, etc. was summarized. The progress and related research provide the basis for future exploration and evaluation of HDR resources on the southeast coast of China.
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Key words:
- HDR resources /
- southeast coast /
- genetic model /
- exploration progress
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图 1 东南沿海部分地区地壳厚度图(Guo et al., 2019)
Figure 1.
图 3 江西南部—福建—台湾综合地球物理剖面图(Zhou and Li, 2000)
Figure 3.
表 1 东南沿海地区不同岩石类型的单位体积生热率(赵平等，1995；林乐夫等，2017)
Table 1. Heat production per unit volume of different rock types on the southeast coast of China(Zhao et al., 1995; Lin et al., 2017)
岩石类型 平均单位体积生热率/
(μW/m3)不同时代花岗岩 晋宁期花岗岩 3.1 加里东期花岗岩 3.3 印支期花岗岩 3.9 燕山早期花岗岩 5.2 燕山晚期花岗岩 6.4 凝灰岩 2.7 碳酸盐岩 0.59 
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表 2 模型主要参数表
Table 2. Main parameters of the model
模型部分 孔隙度 渗透率/
m2热导率/
W/(m·K)热储 0.01 1×10-17 3.4 浅部断裂 0.05 1×10-12 5.5 深部断裂 0.02 1×10-17 5.5
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