Estimation of TEM observation time due to conductor covered layer
The low-resistivity covered layer has shielding effects on transient electromagnetic (TEM) field above prospecting target.The probing depth of TEM depends on observation time.So, it is of great guiding significance to study the estimation method of observation time with low-resistivity covered layer.Firstly, the finite-difference time-domain method was used to analyze the change laws of underground electric field with observation time.From FDTD analysis, we know that the low-resistivity covered layer will not only affect the detection depth, but also weaken abnormal response of underground target.Secondly, based on the calculation of 2-layer geo-electric section, formula of departure time for anomaly was set up.Finally, the comprehensive apparent resistivity of layered medium was calculated and the estimated results of observation time with different electrical characteristic were given.
low resistivity Layer shielding effect TEM
Dongyang Hou Guoqiang Xue Nan-nan Zhou Shu Yan
Institute of Geology and Geophysics Chinese Academy of Sciences Beijing, China School of computer science and telecommunication engineering Jiangsu University Zhenjiang, China
国际会议
北京
英文
194-196
2016-06-27（万方平台首次上网日期，不代表论文的发表时间）