NDLI: A Broadband Electromagnetic Propagation Logging With Linear Frequency Modulation Signal

Content Provider	IEEE Xplore Digital Library
Author	Kebin Zhu Zaiping Nie Xiangyang Sun
Copyright Year	2004
Abstract	In this letter, a novel broadband electromagnetic (EM) propagation logging method with linear frequency modulation (LFM) continuous waves (LFMCWs) as well-logging signals has been proposed for logging while drilling (LWD). The logging response of the layered media to the LFMCWs under the noise environment has been numerically modeled using numerical mode matching (NMM) and inverse fast Fourier transform (IFFT). Based on the frequency spectrum of LFM signals, the NMM method is used first to calculate both the amplitude and the phase of the signals in receiving coils for every frequency point, and then, IFFT is applied to convert them to the logging response in the time domain. After that, the matched filter method has been imposed to realize pulse compression of the received signals and to improve the peak SNR (PSNR) significantly. As the logging responses of the EM propagation logging tool, the amplitude ratio and the phase difference between the compressed signals from the two separated coils at the peak point are obtained, respectively. Then, the apparent conductivity based on the amplitude ratio and the phase difference is obtained to have the logging curves. It has been shown from the simulation results that using LFMCWs as wideband logging signals can improve the SNR and the logging resolution remarkably, particularly under the condition with correlated noise that restrained the SNR and logging resolution strongly in traditional logging with a single-frequency continuous wave.
Sponsorship	IEEE Geoscience and Remote Sensing Society
Starting Page	758
Ending Page	762
Page Count	5
File Size	831898
File Format	PDF
ISSN	1545598X
Volume Number	11
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Conductivity Signal to noise ratio Coils Frequency-domain analysis White noise Signal resolution pulse compression Broadband well logging electromagnetic (EM) propagation logging linear frequency modulation (LFM) signal logging while drilling (LWD)
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Geotechnical Engineering and Engineering Geology

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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