活性炭测氡法在地热勘探中的应用——以张掖—民乐盆地为例

地热的运移和聚集主要沿断裂带进行,查明勘查区的断裂构造是地热勘探的重要目标。张掖—民乐盆地内断裂众多,且埋藏深,地表难以发现,特殊的地质条件使得传统物探方法的优势无法得到有效发挥。活性炭测氡法抗干扰性强、探测深度大、成本低,在探测隐伏构造方面具有独特优势。本次勘查在张掖—民乐盆地应用活性炭测氡法进行隐伏构造研究,通过对氡浓度测量值的趋势分析,提取局部异常,确定了研究区地下热水勘查有利部位,并为进一步进行钻探和浅层人工地震勘探创造了条件。

Application of the activated charcoal radon measurement in the geothermal exploration:A study of the Zhangye-Minle basin

Geothermal energy mainly migrates and accumulates along fractured zones. Ascertaining the faults in the study area is an important goal of geothermal exploration. Many faults are distributed in the Zhangye-Minle basin. They are deeply buried and are difficult to find on the surface. The special geological conditions make it difficult to fully utilize the advantages of conventional geophysical methods. By contrast, the activated charcoal radon measurement features strong anti-interference, large detection depth, and low cost, which are unique advantages in detecting concealed structures. This study investigated the concealed structures in the Zhangye-Minle basin using the activated charcoal radon measurement. Through the trend analysis of measured radon concentrations, this study extracted local anomalies and determined the favorable parts for the geothermal water exploration in the study area, creating conditions for further drilling and shallow artificial seismic exploration.