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.
伍显红, 许第桥, 李茂. 宽频大地电磁法在二连盆地铀矿资源评价中的试验应用[J]. 物探与化探, 2022, 46(4): 830-837.
WU Xian-Hong, XU Di-Qiao, LI Mao. An application test of broadband magnetotelluric method (BMT) for the evaluation of uranium resources in the Erlian Basin. Geophysical and Geochemical Exploration, 2022, 46(4): 830-837.
Zhang J D. Rational planning and scientific layout,actively promoting the construction of large uranium bases[C]// Zhang J D, Li Z Y, Su Y R. Proceding of the national symposium on the construction of large uranium bases. Beijing: Chinese Nuclear Society, 2012: 1-4.
傅良魁. 电法勘探教程[M]. 北京: 地质出版社, 1983:150-151.
Fu L K. Course of electrical exploration[M]. Beijing: Geological Publishing House, 1983:150-151.
Kong Z Z, Xie M H, Shan K S, et al. Research Report on comprehensive geophysical prospecting method in low resistance area of Northern songliao Basin[R]. Shijiazhuang:Nuclear Industry Aerial Survey Remote Sensing Center, 2020.
Kuang W Z, Kang S H. Regional evaluation report on uranium resources in Wulanchabu depression and its surrounding area in Erlian Basin,inner Monggolia[R]. Baotou,Inner Mongolia:Nuclear Industry 208 Team, 2012.
Shan K S, Qiao Y, Shen J B, et al. Audio magnetotelluric survey report in Erenzhuoer area of Wulanchabu depression,inner Mongolia[R]. Shijiazhuang:Nuclear Industry Aerial Survey Remote Sensing Center, 2008.
Zhang J W, Zhang Z B, Li Y B, et al. Controlled source audio magnetotelluric survey report in Yihetu area of Wulanchabu depression,inner Mongolia[R]. Shijiazhuang:Nuclear Industry Aerial Survey Remote Sensing Center, 2013.
Xu D Q, Kong Z Z, Zhao C, et al. Mandulatu of Erlian basement in Inner Mongolia and research report on electromagnetic detection technology in Wejing area[R]. Shijiazhuang:Nuclear Industry Aerial Survey Remote Sensing Center, 2020.