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Study on the exploration depth of transient electromagnetic method in northern China coalfield

HAN Zi-hao1,2,WEI Wen-bo1,ZHANG Wen-bo1(1.School of Geophysics and Information Technology,China University of Geosciences,Beijing 100083,China;2.Geophysical Exploration & Surveying Team of Coal Geology Bureau of Henan Province,Zhengzhou 450009,China)  
For the study on the exploration depth of transient electromagnetic method(TEM) in northern china coalfield,the formulas to calculate the time of latest detectable signal and the maximum depth of exploration were developed from the formula for late time apparent resistivity by assuming the minimum detectable signal of instrument,also the time of the latest detectable signal and the maximum exploration depth for some conditions were calculated: when the transmit moment is 10002×20 A·m2,and the resistivity of the earth is 10 and 100 Ω·m respectively,the time of latest detectable signal is 209.6 ms and 52.6 ms,the maximum depth of exploration is 1823m and 2889m.A typical TEM exploration curve acquired in a coalfield in northern China was inversed using 1-D inversion software and the maximum depth is 1400 m.The results show that TEM can satisfy the depth demanded to the exploration in northern China coalfield if appropriate instrument is applied and the correct array is adapted.
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