巴彦乌拉铀矿床精细三维地质建模

地浸采铀是一种通过溶浸液与砂岩矿层中含铀矿物发生溶解反应的矿石原位开采方法，厘清矿层及矿层上覆下伏含水层三维结构，对提高地浸采铀效率具有重要意义。在资料收集的基础上，结合测井数据，采用地质统计学方法，对地浸采区地层及矿层进行精细刻画，建立了相应三维地质模型，根据模型模拟结果分析了含矿含水层的空间结构特征。结果表明，含矿含水层主要岩性为粗砂岩；含矿含水层各种岩性孔隙连通性较好，透水岩性分布较均匀；采区地层倾向大致为325°，倾角为6.76°。顶部隔水层厚度呈南部和中部较厚、北部和西部较薄的特点，发育7个隔水顶板天窗；矿层贴近隔水底板，厚度由北部向各个方向逐渐减薄，矿层厚度与含矿含水层厚度呈正相关。三维地质结构模型的构建完整、直观地展示了巴彦乌拉铀矿C12采区地层、岩体的三维空间分布特征，可以为进一步开展地浸采铀数值模拟研究提供科学依据。

Fine 3D Geological Modeling of Bayanwula Uranium Deposit

In-situ leaching uranium mining is a kind of in-situ ore mining method through the dissolution reaction between leaching solution and uranium bearing minerals in sandstone layer. It is of great significance to improve the efficiency of in-situ uranium mining to clarify the three-dimensional structure of ore bed and aquifer overlying it. On the basis of data collection, combined with well logging data, geostatistics method was used to fine classify the strata and ore layers in the mining area, the corresponding three-dimensional geological model was established, and the spatial structure characteristics of ore-bearing aquifer was analyzed according to the model simulation results. The analysis results show that the main lithology of ore-bearing aquifer is coarse sandstone. The ore-bearing aquifer has good pore connectivity and uniform distribution of permeable lithology. The formation dip of the mining area is approximately 325° and the dip angle is 6.76°. The thickness of the top water-repellent layer is thicker in the south and middle part, and thinner in the north and west part. Seven water-repellent roof skylights are developed. The thickness of the ore bed is close to the water-repellent floor, and gradually drops from the north to all directions. The thickness of the ore bed is positively correlated with the thickness of ore-bearing aquifer. The construction of three-dimensional geological structure model completely and intuitively shows the three-dimensional spatial distribution characteristics of strata and rock mass in C12 mining area of Bayanwula uranium mine, which can provide scientific basis for further numerical simulation research of in-situ leaching uranium mining.