Volume 45 Issue 4
Aug.  2017
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CHEN Mingsheng, XU Yangcheng. Suitable algorithm of transient electromagnetic turn-off effects and whole-stage apparent resistivity[J]. COAL GEOLOGY & EXPLORATION, 2017, 45(4): 131-134. DOI: 10.3969/j.issn.1001-1986.2017.04.023
Citation: CHEN Mingsheng, XU Yangcheng. Suitable algorithm of transient electromagnetic turn-off effects and whole-stage apparent resistivity[J]. COAL GEOLOGY & EXPLORATION, 2017, 45(4): 131-134. DOI: 10.3969/j.issn.1001-1986.2017.04.023
shu

Suitable algorithm of transient electromagnetic turn-off effects and whole-stage apparent resistivity

  • 1. Xi'an Research Institute, China Coal Technology and Engineering Group Corp., Xi'an 710077, China;

  • 2. Chongqing Research Institute of China Coal Techonogy & Engieering Group Corp., Chongqing 400039, China

Funds: 

National Natural Science Foundation of China(41374150)

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  • Received Date: August 05, 2016
  • Published Date: August 24, 2017
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    • Abstract
  • Firstly the transient electromagnetic(TEM) field convolution was given, and change rate of turn-off current is taken as a impact function, the field component of vertical step pulse excitation as the input signal. The convolution result is TEM response of arbitrary shape turn-off current. The current excitation pulse is regarded as a superposition of many vertical step function. The transient electromagnetic response of arbitrary current pulse excitation is induced by the superposition of step function response. When the measured value of TEM field and the turn-off current form are known, whole-stage apparent resistivity can be calculated by the method of programming. The paper gives two examples on TEM vertical magnetic field of slope turn-off current excitation of electric dipole source, a response of uniform half-space and all-time apparent resistivity, a response to the three K-type geoelectric section and whole-stage apparent resistivity.
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    • References (6)
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