二连盆地乔尔古地区广域电磁法砂体识别技术研究  

Wide Field Electromagnetic Method Based Identifying Technique for Sand Body of Sandstone-type Uranium Deposit

作　　者：汪硕[1] 段书新[1] 吕孝勇 胡英才[1] 吴曲波[1] 刘祜[1] 刘武生[1] WANG Shuo;DUAN Shuxin;LYU Xiaoyong;HU Yingcai;WU Qubo;LIU Hu;LIU Wusheng(CNNC Key Laboratory of Uranium Resources Exploration and Evaluation Technology,Beijing Research Institute of Uranium Geology,Beijing 100029,China;Geosun Hi-technology Co.,Chang Sha,Hunan 410208,China)

机构地区：[1]核工业北京地质研究院,中核集团铀资源勘查与评价技术重点实验室,北京100029 [2]湖南继善高科技有限公司,湖南长沙410208

出　　处：《铀矿地质》2020年第5期418-423,共6页Uranium Geology

基　　金：中核集团龙灿工程(二期)科研项目“二连基地砂岩型铀矿物化探三维探测技术研究”(编号:物LCEQ02)资助。

摘　　要：二连盆地的砂岩型铀矿赋存于电阻率较低的砂泥岩中,整体较低的电阻率对电磁法的纵向分辨能力提出了较高的要求。本次研究采用基于人工源频率域电磁测深原理的广域电磁法,通过在二连盆地乔尔古地段典型地质剖面上开展对比试验研究,划分了反演断面上的中高阻异常体,推断为可能赋存铀矿的目标砂体。研究表明,通过一维模型约束反演、深度线性校正等技术能够较准确的分辨地下200 m以浅的砂、泥互层,对埋深600 m左右的厚大砂体也有较好的识别效果。The sand-body in Erlian Basin is mostly of low resistivity rocks,such as mudstone,sandstone.Therefore,the vertical resolution is needs to be high to separate the low resistivity zone from the background.In this study,Wide Field Electromagnetic Method(WFEM)was utilized in the frequency domain which is an artificial electromagnetic sounding method.Through the comparison of typical geological profile with WFEM results,the middle-high resistivity zones were delineated as sand-body and be considered as the favorable layer of uranium.The study indicated mud-sand alternating layers beneath 200 m and thick sand-body beneath 600 m can be discriminated by 1D constrain inversion and linear depth correction.

关 键 词：砂岩型铀矿 广域电磁法 砂体识别 二连盆地 

分 类 号：P631.325[天文地球—地质矿产勘探]