二连盆地芒来铀矿床镭氡平衡系数研究  

Study on the Radium Radon Equilibrium Coefficient of the ManglaiUranium Deposit in Erlian Basin

作　　者：熊攀 XIONG Pan(Geologic Party No.208,CNNC,Baotou 014010,China)

机构地区：[1]核工业二〇八大队,内蒙古包头014010

出　　处：《铀矿冶》2024年第1期12-19,共8页Uranium Mining and Metallurgy

基　　金：中国核工业地质局“内蒙古二连盆地及周边铀矿资源调查评价与勘查”项目(202202)。

摘　　要：在可地浸砂岩型铀矿地质勘查中,矿体的镭氡原始平衡状态被破坏,造成γ测井解释得到的矿层铀含量偏低,影响铀资源量估算的准确度。通过施工物探参数孔,对γ测井解释的铀含量进行镭氡平衡系数修正。以二连盆地芒来铀矿床普查阶段施工的物探参数孔观测数据为例,对参数孔内遭受破坏的矿段进行多次γ测井状态观测,绘制相应的镭氡观测曲线,并对采用平均值法和拟合法计算得到的镭氡平衡系数进行了对比分析。结果表明,2种计算方法得到的镭氡平衡系数相对误差均在±3%以内,且采用拟合法计算的结果比平均值法计算的结果小,采用拟合法有利于降低估算漏矿的可能性。通过建立数学非线性回归模型,基于MATLAB软件运行编程语言实现对观测数据的曲线拟合,得到可求极限的数学拟合公式。通过拟合法得到的曲线更符合理论上镭氡平衡破坏后的恢复情况,求得的氡饱和状态观测值唯一且确定,有效避免了因观测数据波动带来的不可控误差,计算得到的镭氡平衡系数更为科学和准确。研究结果为该矿床铀资源储量的准确估算提供了客观可靠的修正系数,也为铀矿山生产能力的预测提供了指导。In the geological exploration of in-situ leachable sandstone type uranium deposits,the original equilibrium state of radium and radon in the ore body is disrupted,resulting in the low uranium content in the ore layer obtained fromγlogging interpretation,which affects the accuracy of uranium resource estimation.By constructing geophysical parameter holes,the uranium content interpreted byγlogging is corrected for the radium radon equilibrium coefficient.Taking the observation data of geophysical parameter holes during the reconnaissance phase of the Manglai uranium deposit in the Erlian Basin as an example,multipleγlogging observations were conducted on the disrupted ore sections in the parameter holes,and corresponding radium and radon observation curves were drawn.The results of radium radon balance coefficients calculated using the average method and fitting method were compared and analyzed.The results show that the relative errors of the calculated values obtained by the two calculation methods are within±3%,and the results calculated using the fitting method are smaller than those calculated using the average method.Using the fitting method is beneficial for reducing the possibility of estimating leakage.By establishing an appropriate mathematical nonlinear regression model and running programming language based on MATLAB software,curve fitting of observed data is achieved,and a mathematical fitting formula that can calculate the limit is obtained.The curve obtained by the fitting method is more consistent with the recovery situation after the destruction of the radium radon balance in theory,and the radon saturation observation value obtained is unique and determined,effectively avoiding the uncontrollable error caused by the fluctuation of the observation data.The calculated radium radon balance coefficient is more scientific and accurate.The research results provide an objective and reliable correction coefficient for the accurate estimation of the uranium resource reserves of the deposit,and also pro

关 键 词：芒来铀矿床 物探参数孔 镭氡平衡系数 曲线拟合 Γ测井 

分 类 号：P619.14[天文地球—矿床学] TL2[天文地球—地质学]