山东省济南市莱芜区雪野湖地区地热氡泉形成机理探析

Formation Mechanism of Geothermal Radon Spring in Xueyehu Area in Laiwu District of Ji'nan City in Shandong Province

摘要:

济南市雪野湖DR1地热井地热流体中氡含量达到379.74～563.33Bq/L，属于稀有的地热氡泉资源。为查明雪野湖地区氡泉分布特征及形成机理，开展了电阻率联合剖面测量、可控源音频大地电磁（CSAMT）测量、土壤氡气测量、水氡测试等工作。研究区内氡泉（氡异常）分布在岩浆岩侵入区，受断裂构造裂隙带、侵入接触裂隙带控制呈带状分布。研究区广泛发育的酸性花岗岩类为地热氡泉形成提供了物源条件；断裂构造裂隙带提供了地下水与氡迁移、富集的空间条件，亦是深部热源沟通的通道，地热氡泉受断裂构造控制形成。

Abstract:

The radon content in geothermal fluid of DR1 geothermal well in Xueyehu reaches 379.74～563.33Bq/L. It is a rare geothermal radon spring resource. In order to find out the distribution characteristics and formation mechanism of radon springs in Xueyehu area, resistivity joint profile measurement, controllable source audio frequency magnetotelluric method (CSAMT) measurement, radon test in soil, radon test in water have been carried out. Radon springs (radon anomalies) in the study area are distributed in the magmatic rock intrusion area, which is controlled by fault structural fracture zone and intrusion contact fracture zone. The widely developed acidic granitoids in the study area provide material source conditions for the formation of geothermal radon springs. The fracture zone of fault structure provides spatial conditions for the migration and enrichment of groundwater and radon. It is also the channel for the communication of deep heat source. The geothermal radon spring is formed under the control of fault structure.