湖南汝城干热岩地热地质特征及资源潜力

Geothermal geological characteristics and resource potential of Hot Dry Rock in Rucheng,Hunan Province

湖南汝城地热资源丰富,但干热岩地热资源相关研究处于起步阶段。为进一步查明汝城地区干热岩地热特征及资源潜力,通过野外地质调查、采样测试、地热成因分析等方法手段,分析了该区干热岩地热赋存条件,参照国内干热岩勘查靶区选址标准对区内干热岩靶区进行了评价,采取体积法估算了资源总量。研究认为,汝城区内中酸性岩浆岩体发育,地热地质背景良好,花岗岩生热率达6.45μW/m^(3),为高放射性花岗岩体,属于“热壳冷幔”热结构类型,被评为干热岩资源靶区适宜区。深度2~6 km的干热岩总资源量为13.06×10^(17) kJ,折合标准煤445.60×10^(8) t,资源潜力较好。该研究为汝城地区干热岩地热资源的开发提供了科学依据和技术支持,奠定了地热能可持续利用的基础,并具有较好的指导意义。

Although there are abundant geothermal resources in Rucheng,Hunan,research on Hot Dry Rock(HDR)geothermal resources is still in its early stages.In order to learn more about the geothermal characteristics and resource potential of HDR in the Rucheng area,this paper analyzes the geothermal occurrence conditions of HDR in this area using a field geological survey,sampling test,and geothermal resource genesis analysis.According to the site selection standard of the HDR exploration target area in China,the HDR target area in the area is evaluated,and the volume method is employed to estimate the amount of HDR resources.The research indicates that the Rucheng area has a well-developed intermediate-acid magmatic rock mass with a good geothermal geological background.The heat generation rate of granite is 6.45μW/m^(3),which makes it a highly radioactive granite.It belongs to the'hot crust and cold mantle'thermal structure type and is rated as the suitable area for the target area of HDR resources.At a depth of 2~6 km,the total amount of HDR resources is 13.06×10^(17) kilocalories,equivalent to 445.60×10^(8) tons of standard coal,with good resource potential.This study provides a scientific basis and technical support for the development of HDR geothermal resources in the Rucheng area,lays the foundation for the sustainable utilization of geothermal energy,and has good guiding significance.