湿度修正对砂岩型铀矿资源量估算的影响  

Effect of Humidity Correction to Resources of Sandstone-type Uranium

作　　者：高龙 陈霜 王佩华 侯树仁 彭爽 GAO Long;CHEN Shuang;WANG Peihua;HOU Shuren;PENG Shuang(Geological Party No.208,CNNC,Baotou,Inner Mongolia 014010;East China University of technology,Nanchang,Jiangxi 330063)

机构地区：[1]核工业二〇八大队,内蒙古包头014010 [2]东华理工大学,江西南昌330063

出　　处：《铀矿地质》2024年第3期547-554,共8页Uranium Geology

基　　金：辽河石油勘探局项目“内蒙古通辽市钱家店铀矿床钱Ⅲ块详查”(编号:2011-001)资助。

摘　　要：依据《γ测井规范》(EJ/T 611—2015),当铀矿石湿度大于5%时,γ测井解释时应对矿石品位进行修正;地浸砂岩型铀矿床一般采用矿石湿品位、湿密度,少数单位使用矿石干品位、干密度。采用矿石湿品位只是将湿度修正值带入到矿石密度中,忽略了湿度修正系数变化对矿层厚度的影响;采用矿石干品位是将边界品位(0.010%)视为γ测井解释下限,待解释结果出来后再对品位进行湿度修正,也忽略了湿度修正系数变化对矿层厚度的影响,这种处理方法源自于硬岩型铀矿床。上述两种湿度修正方法,相当于变相提高了矿段解释品位下限,对于矿石品位相对较低且γ测井曲线边界不清楚的矿段,厚度变薄,进而估算的铀资源量也相应减少。研究表明,目前湿度修正方法会造成个别铀矿床的资源量最多可减少1/3左右,且是易浸出的优质资源;对于品位较高的砂岩型铀矿床或硬岩型铀矿床,γ测井曲线边界清楚,无论使用矿石湿品位、湿密度,还是使用矿石干品位、干密度,对铀资源量估算影响不大。建议估算地浸砂岩型铀矿资源储量时采用矿石干品位、干密度为宜。According to"specification forγLogging"(EJ/T 611—2015),the uranium grade by logging interpretation should be corrected while the humidity of uranium ore is bigger than 5%;Usually,the wet grade and wet density of ore are used for in-situ leaching sandstone type uranium deposits,but in some cases,dry grade and dry density is also used.The wet grade is used to correct the ore density by humidity content,however the affection to ore depth is not concerned;The dry grade is to used to calculated the cut-off grade(0.010%)as the lower limit ofγlogging interpretation that is originated from hard rock type uranium deposit,which is also ignoring humidity correction coefficient’s affection to ore depth.This two humidity correction methods will result in the raise of the low limit of the ore section interpretation’s grade and the decrease of the ore thickness and estimated uranium resources,especially in the case of low grade and not clearγlogging curve boundary.Our research showed that the present humidity correction method will reduce the easily leached uranium resources for specific uranium deposit at a third upmost;For higher-grade uranium deposits or hard rock type uranium deposit,there is little impact on the resource estimation by wet grade,wet density or dry grade,dry density.Thus dry grade,dry density are recommended when estimating the uranium resources for in-situ leaching uranium deposits.

关 键 词：砂岩型铀矿 湿度修正 边界品位 平米铀含量 资源量 

分 类 号：P631.8[天文地球—地质矿产勘探]