松辽盆地宝龙山地区钻孔γ照射量率分布特征  

Distribution Characteristics of Gamma-ray Exposure Rate of Boreholes in Baolongshan Area of Songliao Basin

作　　者：黄笑 杨亚新[3] 王殿学 罗齐彬 蔡建芳[1] 周文博[1] 张亮亮[1] 余弘龙 马振宇 HUANG Xiao;YANG Yaxin;WANG Dianxue;LUO Qibin;CAI JianfangZHOU Wenbo;ZHANG Liangliang;YU Honglong;MA Zhenyu(Geologic Party No.243,CNNC,Chifeng,Inner Mongolia 024000,China;School of Geophysics and Measurement-control Technology,East China University of Technology,Nanchang Jiangxi 330013,China;School of Nuclear Science and Engineering,East China University of Technology,Nanchang Jiangxi 330013,China)

机构地区：[1]核工业二四三大队,内蒙古赤峰024000 [2]东华理工大学地球物理与测控技术学院,江西南昌330013 [3]东华理工大学,核资源与环境国家重点实验室,江西南昌330013

出　　处：《铀矿地质》2019年第5期305-312,共8页Uranium Geology

基　　金：国家自然科学基金项目“砂岩型铀矿钻孔中放射性场特征和铀矿化关系研究及应用”(编号:41574102);国家自然科学基金项目“地气测量寻找铀矿的机理及快速测量方法研究”(编号:41774134);中国核工业地质局项目“松辽盆地南部奈曼-大安地区铀矿资源调查评价与勘查”(编号:201910);“国防科工局核能开发【2017】1403”项目联合资助

摘　　要：钻孔γ照射量率是确定铀矿石品位、圈定铀矿体边界的主要依据和指标。在所收集的宝龙山地区钻孔γ测井资料以及区域、矿床地质资料的基础上,系统地统计、分析了井中γ照射量率的背景值、均值、均方差、变异系数等,总结出钻孔γ照射量率在不同地层、不同岩性段中的分布特征、变化规律;结合地质背景,总结了放射性元素迁移富集规律,查明了γ照射量率与铀矿化的关系,探索了其找矿意义。研究结果显示:在有利成矿的砂体中,钻孔γ照射量率均值大小反映了岩层中放射性元素的富集程度,均方差及变异系数则反映了岩层中放射性元素富集的均一性;均值、均方差及变异系数同时增大,且稳定变化,表明地层放射性元素含量增加,易形成品质较好的工业铀矿体。该成果可用于指导钻探工作部署,提高找矿效率。Gamma-ray exposure rate of boreholes is the fundmental criterior and index for determining the grade of uranium ore and delineating the boundary of uranium orebody.Based on the collected drilling gamma logging data,regional and deposit geological data in Baolongshan area,the background value,mean-variance and coefficient of variation of gamma exposure rate in boreholes were systematically analyzed in this paper.The distribution characteristics and variation pattern of drilling gamma exposure rate parameters in different strata,different lithology segments were summarized by combiny with the geological background,the migration and enrichment law of radioactive elements and the favorable horizon has been identified for uranium enrichment and mineralization.The results showed that in the favorable ore-forming sand bodies,the mean value of gamma exposure rate of the borehole can reflect the enrichment of radioactive elements in the stratum,while the mean-variance and coefficient of variation can reflect the uniformity of enrichment and mineralization of radioactive elements in the stratum.The increase,and stably change of both the mean value,mean-variance,and coefficient of variation means the the increase of radioactive elements in the target formation and easy to form industrial uranium ore with high quality.The results of this study can guide the deployment of drilling and improve the efficiency of prospecting.

关 键 词：钻孔γ照射量率 元素富集 砂岩型铀矿 

分 类 号：P631.8[天文地球—地质矿产勘探]