测氡技术在泉州清源山地下水源勘查中地应用

测氡是一种有效的放射性地球物理探测方法。由于含水裂隙基岩与其周边岩体的结构存在差异，氡气的浓度异常可间接反映出地质体裂隙系统的情况，并可分析其开启度、连通性，以及破碎程度。应用测氡技术对地下水资源进行勘探，对含水裂隙基岩的结构特征进行研究，能达到节约投资，缩短勘探时间的目的。并可与地质资料分析相互验证，为地下水勘察应用提供依据。这里将测氡技术应用于泉州市清源山地卞水资源勘探工作中，旨在寻找基岩山区地下水富集带。测氡结果显示，在清源山一带明显存在二条北西西向和北西向断裂，结合地质资料认为：F1断裂带和F2断裂带是地下水赋存的理想位置，而且这二条断裂延伸2．5km～3．0km，汇水面积大于13km^2，大气降水的补给能力5770m^3／d，每年的补给量可达211×10^4m^3。

Application of radon-detection for groundwater exploration in Qingyuanshan of Quanzhou region

Radon-detection is an effective geophysical radiometry.Because of the difference of structures between fractured rock and base-rock body,the abnormity of the concentration of radon could reflect the state of fractures,and could be used to analyze the extent of opening,connectedness,and the crashing extent of fractures.It can be made use of in exploration of groundwater,and describing of the fractures character.Combining with the geological data,it could accurately be the base of exploration of groundwater resource.Here,for the aim of groundwater-rich zones,radon-detection was applied in exploration of fracture groundwater resource in Qingyuan mountain in Quanzhou,east-southern China.And the results shown that there was two obvious faults named F1 and F2,with the direction of North-West-West and North-West in Qingyuan mountain.Combining with the geological data,F1 fault was engendered from orogeny,and F2 fault was original from invading of granitoids and tectonic activity,they were an ideal reserving space of groundwater.And the extending of the faults was 2.5 km~3.0 km,water catchment area was more than 13 km2 with 211×104 m3/a of precipitation recharge,the storage of fracture groundwater was about 5.1×108 m3.