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干热岩资源不同于传统的化石能源,具有可再生、储量大、高度清洁等优势。粤北佛冈地区地热活动明显,岩体时代较新,出露面积巨大,有利于形成干热岩系统。佛冈岩体主体岩性为燕山期黑云母花岗岩,37个花岗岩样品U,Th,K含量的平均值分别为11×10-6,51×10-6,5.12%,Th/U比为4.96,密度为2.56 g/cm3,单位体积生热率平均值为6.77μW/m3。区内发育的NE向、EW向深大断裂和次一级断裂,共同控制着地温场的分布。此外,研究区相对薄的岩石圈厚度表明地幔热也是佛冈岩体的重要热源之一。初步结论认为,佛冈岩体生热率远高于世界范围内花岗岩的平均值,放射性生热元素含量高,且区内导热、控热构造明显,地壳厚度低于周边地区,可做进一步详查评估工作。
Dry hot rock resources are different from the traditional fossil fuels, with renewable, large reserves, a high degree of cleaning and other advantages. The geothermal activity in Fogang area in northern Guangdong is obvious. The age of rock mass is relatively new, and the exposed area is huge, contributing to the formation of dry-hot rock system. The main lithology of the Fagang pluton is Yanshanian biotite granite. The average contents of U, Th and K in 37 granite samples are respectively 11 × 10-6, 51 × 10-6, 5.12% and the Th / U ratio is 4.96 , The density of 2.56 g / cm3, the average heat capacity per unit volume of 6.77μW / m3. The NE-trending and EW-trending deep faults and secondary faults in the area jointly control the distribution of geotemperature field. In addition, the relatively thin lithosphere thickness in the study area indicates that mantle heat is also one of the important heat sources of the Fagang rock mass. The preliminary conclusion is that the heat rate of the Fagang rock mass is much higher than the average value of the granite in the world, the content of radioactive heat elements is high, the thermal conductivity and thermal control structure are obvious in the area, and the crustal thickness is lower than the surrounding area. Check assessment work.