某砂岩型铀矿床井间示踪技术应用研究

Application of inter well tracer test in some sandstone-type uranium deposit

为了查明矿床地下水的连通性和连续抽出条件下地下水渗流速度等地浸地质条件,给矿床地浸地质条件评价提供依据。在某砂岩型铀矿床开展井间示踪试验,试验结果显示,示踪剂突破时间为15d,峰值时间为54d,峰值浓度为2.561mg/L。依据水动力条件下含矿含水层的溶液渗流速度公式,计算出地下水平均流动速度为0.51m/d,表明地下水连通性较好;通过示踪试验期间两次停机前后示踪剂浓度值变化极小这一结果可知地下水在天然状态下流动性较弱;示踪剂浓度随时间变化曲线表明试验区段地下水赋存性质呈现孔隙水特征。

In order to find out the in-situ leaching geological conditions such as the groundwater connectivity of the ore deposit and the groundwater seepage velocity under continuous extraction conditions,it provides a basis for evaluating the in-situ leaching geological conditions of the deposit.Inter well tracer test are carried out in the test section,then sampling analysis and tracer concentration detection are carried out on the pumping well,through the analysis of tracer detection results,tracer breakthrough time is 15 d,and peak time is 54 d,and peak concentration is 2.561 mg/L.Based on the hydrodynamic conditions of ore-bearing aquifer solution seepage velocity formula,to calculate the groundwater seepage velocity is 0.51 m/d.Through the analysis of tracer test twice during downtime changing situation of the tracer density,the mobility of the nature underground water is weaker in test section.It can be concluded that the underground water type in the test section not conform the characteristics of fracture water.