氡气测量在嘉鱼县地热资源勘查中的应用

Application of Radon Measurement in Geothermal Resources Exploration of Jiayu County

在嘉鱼县地热资源勘查中,对调查区50 km2沿垂直构造线走向布置37条土壤氡气测量剖面线,共测1 262个氡气点。利用统计方法对测量数据进行分析,确定调查区氡气的背景值和阀值。结果表明,逆冲断裂正上方氡无异常显示,而断裂上盘一侧氡气具有异常显示,异常位置与断层倾向具有较好的一致性,尤其在两组断裂交汇处异常值明显。根据氡气异常确定调查区内被第四系覆盖的高铁隐伏断裂(F22)的位置及断面倾向,分析断裂与调查区地热异常的关系以及地热田形成机理,建立地热田结构概念模型,通过钻孔印证了断裂与地热田关系。

During the geothermal resource exploration in Jiayu County,a total of 1 226 radon gas points were measured by arranging 37 soil radon gas measurement profiles along the vertical tectonic line for 50 km2 in the survey area.The background value and threshold value of radon in the survey area were determined by analyzing the measured data by statistical method.It turns out there is no abnormal radon in the upper part of the thrust fault,but radon in the upper wall of the fault shows abnormal radon,the anomalous position is in good agreement with fault tendency,especially at the intersection of two groups of faults.Based on radon anomaly,the location and sectional tendency of the Quaternary covered Gao Tielin Hidden Fault(F22) in the investigation area are determined,analysis of the relationship between faults and geothermal anomalies in the investigation area and the formation mechanism of geothermal fields,establishment of conceptual model of geothermal field structure,the relationship between faults and geothermal fields has been confirmed by drilling holes.