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| TEM INTERFERENCE SUPPRESSION IN EXPLORATION OF THE MINED-OUT AREA IN THE COAL MINE |
| FAN Tao1, AN Shao-peng2, WANG Xiu-chen1, WANG Xin-wen1 |
1. Xi'an Research Institute of China Coal Technology & Engineering Group Corp., Xi'an 710077, China;
2. Changqing Division of East Exploration Department of BGP, CNPC, Xi'an 710021, China |
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Abstract Coal transient electromagnetic exploration is often conducted around a coal mine where man-made interference is stronger and noise in a secondary induction field signal-level is mostly rather high, and hence it is difficult to carry out the work of processing and interpretation. In order to eliminate the electromagnetic interference in data, the authors used the average and variance statistics of slope as mechanisms of interference discrimination according to the morphological characteristics of the decay curve and by refering to the properties of neighboring measuring points without suffering from interference, quickly and easily suppressed the interference and restored the original signal satisfactorily. The theoretical data and measured data obtained by this method were used to make processing and interpretation, which proved the effectiveness of this method. This method was used in the detection of the mined-out area of the coal mine, the anomaly interpretation through curve inversion after interference suppression was highly consistent with the data available, and hence the result in agreement with the reality was obtained.
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Received: 30 August 2011
Published: 10 December 2012
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