Stochastic SGILD electromagnetic modeling and inversion

2000 ◽  
Author(s):  
Ganquan Xie ◽  
Jianhua Li ◽  
Michael Oristaglio
Keyword(s):  
Electromagnetic Modeling ◽  
And Inversion

Airborne Transient Electromagnetic Modeling and Inversion Under Full Attitude Change

2017 ◽  
Vol 14 (9) ◽  
pp. 1575-1579 ◽  
Author(s):  
Youzheng Qi ◽  
Ling Huang ◽  
Xucun Wang ◽  
Guangyou Fang ◽  
Gang Yu
Keyword(s):  
Attitude Change ◽  
Electromagnetic Modeling ◽  
Transient Electromagnetic ◽  
And Inversion

Are 3D electromagnetic modeling and inversion useful?

2000 ◽  
Author(s):  
Art Raiche ◽  
Fred Sugeng ◽  
Zonghou Xiong
Keyword(s):  
Electromagnetic Modeling ◽  
And Inversion

2.5D AGILD Electromagnetic Modeling and Inversion

PIERS Online ◽  
2006 ◽  
Vol 2 (4) ◽  
pp. 390-394
Author(s):  
Ganquan Xie ◽  
Jianhua Li ◽  
Feng Xie
Keyword(s):  
Electromagnetic Modeling ◽  
And Inversion

Full transmitter waveform transient electromagnetic modeling and inversion for soundings over coal measures

Geophysics ◽  
1987 ◽  
Vol 52 (3) ◽  
pp. 279-288 ◽  
Author(s):  
Michael W. Asten
Keyword(s):  
Case Depth ◽  
Earth Model ◽  
Electromagnetic Modeling ◽  
Resistive Layer ◽  
Homogeneous Half Space ◽  
Full Waveform ◽  
Transient Electromagnetic ◽  
Electromagnetic Soundings ◽  
And Inversion ◽  
Coal Measures

Modeling of transient electromagnetic soundings requires consideration of the full bipolar transmitter waveform in order to obtain full measurement accuracy from field instruments. The full‐waveform transient may be computed using existing impulse‐response forward algorithms followed by a convolution procedure with truncation and residual estimation after an even number of terms, which results in average increases in run time of about 80 percent. Simple calculations based on approximations for the behavior of transient decay over (a) a conductive layer over a resistive basement, (b) a homogeneous half‐space, and (c) a resistive layer over a conductive basement show that the effect of the full waveform is greatest at sample times near the end of the transmitter off‐time, and for the case of a conductive basement. Failure to consider the full waveform is expected to yield errors in the amplitude of the computed transient in the range of 4 to 100 percent or more, depending upon the sample time and type of earth model. Examples of soundings over moderately conductive coal measures and highly conductive cindered coal show that failure to use the full waveform yields depths and resistivities biased to erroneously high values. The bias is small in the former case, but produces substantial errors in the latter case. Depth to the electrical basement of 300 to 400 m may be estimated to accuracies of approximately 5 percent by computer inversion to three‐layer or four‐layer models.

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