广东省龙门县永汉地热田地热地质条件及成因分析

Geothermal Geological Conditions and Genesis Analysis of Yonghan Geothermal Field in Longmen County,Guangdong Province

广东省龙门县地热资源丰富,查明其形成机理对区域地热资源开发利用有重要意义。以永汉地热田为例,通过地热地质调查、地热钻探、测温、综合研究等工作手段,基本查明了地热田热异常空间分布、热储特征、地温场特征,分析了地热田的成因,为此类地热田的研究提供参考。永汉地热田分2个勘查区,均为灰岩热储,异常形态均呈北东向带状展布,热源主要来自于沟通深部热源断裂带的热对流,北东向断裂构造应力作用下形成的连通性较好的断裂破碎带和裂隙溶洞发育带是地热流体的主要通道。

Longmen County,Guangdong Province is rich in geothermal resources.It is of great significance for the development and utilization of regional geothermal resources to find out its formation mechanism.Taking Yonghan geothermal field as an example,by means of geothermal geological survey,geothermal drilling,temperature measurement and comprehensive research,the spatial distribution of thermal anomaly,thermal reservoir characteristics and geothermal field characteristics are basically found out,and the genesis of geothermal field is analyzed,so as to provide reference for the research of this kind of geothermal field.Yonghan geothermal field is divided into two exploration areas,both of which are limestone thermal reservoirs,and the abnormal forms are distributed in a NE trending belt.The heat source is mainly from the thermal convection of the fault zone connecting the deep heat source.The fracture zone and fracture cave development zone with good connectivity formed under the action of NE trending fault tectonic stress are the main channels of geothermal fluid.