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Effect of transmitter current waveform on transient electromagnetic responses

E. Yu. Antonov, V. S. Mogilatov and M. I. Epov
Effect of transmitter current waveform on transient electromagnetic responses
Russian Geology and Geophysics (April 2019) 60 (4): 492-499

Abstract

The theoretical studies and methodological guidelines for transient electromagnetic (TEM) surveys assume an ideal step turn-off of transmitter current. Yet, the pulse duration in the survey practice is nonzero: It depends on penetration depth and has economic or logistic limitations. The turn-off time, which cannot be too short for technical reasons, affects especially the late-time transient responses, while the transmitter waveform is more essential at early times. Therefore, forward calculations of voltage decay should take into account the real parameters of the turn-off ramp. Earlier it was suggested to use transmitter current of a special waveform to improve the resolution of TEM soundings, e.g., in the designed and successfully tested compensation method. In this study the problem is treated from a broader perspective, in terms of TE and TM polarization of the TEM field. The two components are excited by different sources and behave in different ways in responses of a two-layer earth with a resistive lower layer to transmitter current of different waveforms.


ISSN: 1068-7971
Serial Title: Russian Geology and Geophysics
Serial Volume: 60
Serial Issue: 4
Title: Effect of transmitter current waveform on transient electromagnetic responses
Affiliation: Russian Academy of Sciences, A. Trofimuk Institute of Petroleum Geology and Geophysics, Novosibirsk, Russian Federation
Pages: 492-499
Published: 201904
Text Language: English
Publisher: Allerton Press, New York, NY, United States
References: 13
Accession Number: 2020-084312
Categories: Applied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Secondary Affiliation: Novosibirsk State University, RUS, Russian Federation
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2020
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