纳岭沟铀矿床局部隔水层分布样式及对铀矿开发的影响

Spatial distribution patterns of local impermeable layers and their influence on uranium development in Nalinggou uranium deposit

纳岭沟砂岩型铀矿是鄂尔多斯盆地重要的铀矿床之一,具有含矿含水层厚、岩矿比大的特点。通过详细研究该矿床局部隔水层的空间分布特征,将其总结为3种类型:完整型、残缺型和天窗型,并细分为11种亚类型。详细分析了局部隔水层的空问分布对铀矿开发的影响,不同的局部隔水层空间发育样式,控制着浸出液的不同分布模式。以完整型的同顶不同底亚类和残缺型的双边缺底板亚类进行了动态注采模拟分析,将整个模拟过程分为反应前阶段、初始反应阶段、反应中阶段、浸出液连通阶段、见矿阶段和稳定阶段,对该矿床的下一步有效开采将具有很好的借鉴意义。

Nalinggou sandstone type uranium deposit is one of the most important uranium deposits in Ordos Basin which is characterized by thick ore-bearing aquifer and the bigger rock-ore thickness rate. Based on the detailed study on spatial distribution patterns of local impermeable layers, this paper classified the patterns into three types： completed-type, incompleted-type, and scuttle-type and 11 subtypes. Besides, the influence of spatial distribution patterns of local impermeable layers to uranium exploitation was analyzed. The different patterns had the different functions in controlling the movement patterns of leaching liquid. Moreover, this paper made the dynamic injection and production simulation analysis to subtype of completed-type with same top and different floors between two adjacent areas and incompleted-type with no floor subtype, and the simulation process was divided into six stages, which are before-reaction stage, initial leaching liquid intercommunication stage, uranium-bearing liquid The study result will provide important geological basis for the uranium deposit. reaction stage, discovery stage, reaction stage, and stable stage. further exploitation in Nalinggou