宽频大地电磁法在二连盆地铀矿资源评价中的试验应用  

An application test of broadband magnetotelluric method(BMT)for the evaluation of uranium resources in the Erlian Basin

作　　者：伍显红[1,2] 许第桥 李茂[1,2] WU Xian-Hong;XU Di-Qiao;LI Mao(Airborne Survey and Remote Sensing Center of Nuclear Industry,Shijiazhuang 050002,China;CNNC Key Laboratory of Uranium Resources Geophysical Exploration Technology,Shijiazhuang 050002,China)

机构地区：[1]核工业航测遥感中心,河北石家庄050002 [2]中核集团铀资源地球物理勘查技术中心(重点实验室),河北石家庄050002

出　　处：《物探与化探》2022年第4期830-837,共8页Geophysical and Geochemical Exploration

摘　　要：基于二连盆地砂岩型铀矿大基地建设需要,在满都拉图地区开展了BMT试验应用,旨在研究该方法在2000 m以浅的探测能力及效果,为区内铀矿资源评价提供有效的技术支撑。通过试验区方法数据采集时间及最低频率测试,为兼顾工作效率与效益,最终确定最低探测频率为0.10 Hz、观测时间为60 min,可确保二连盆地探测深度达到1500~2000 m的要求,满足地质任务的需要。方法试验结果与钻孔及浅层地震勘探资料对比分析结果表明:BMT在解决盆地盖层结构、基底构造与目的层砂体发育特征以及断裂构造等地质问题上具有可行性,论证了方法的有效性。An application test of the broadband magnetotelluric method(BMT)was carried out in the Mandulatu area based on the construction needs of a large-scale sandstone-type uranium deposit base in the Erlian Basin.The purpose is to study the detection ability and effect of this method at a depth of 2,000 m and above,provide effective technical support for the evaluation of uranium resources in the area,and improve the effects and benefits of uranium prospecting.In this study,the data acquisition time and the lowest frequency were tested by the test area method.Given the work efficiency and benefit,it is determined that the lowest detection frequency is 0.10 Hz and the observation time is 60 min so that the prospecting depth of Erlian Basin can reach the requirement of 1,500~2,000 m.The comparative analysis of the test results with borehole and shallow seismic data shows that BMT is feasible in solving geological problems such as caprock structure,basement structure,sand body development characteristics of the target layer,and fault structure in the basin.

关 键 词：宽频大地电磁法 铀矿 资源评价 二连盆地 探测频率 

分 类 号：P631[天文地球—地质矿产勘探]