跨孔电波衰减成像初始振幅估算方法比较

doi:10.11720/wtyht.2019.1377

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Abstract

Cross-hole electromagnetic attenuation tomography is a method that uses the amplitude information of electromagnetic waves to invert the distribution of the attenuation constant of the medium by the amplitude change of the electromagnetic wave from the transmitting to the receiving. Transmitter amplitude is also called the initial amplitude, which is generally unknown. Its accuracy largely affects the tomographic results and it needs to be obtained before inversion or by special inversion methods. This paper summarizes four initial amplitude processing methods, i.e., linear fitting method, matrix inversion method, dual-frequency electromagnetic wave method and neighboring traces method. The feasibility of these four methods is verified by synthetic data, and the advantages and disadvantages of each method are pointed out: Linear fitting method is suitable for the case where the physical property changes little; matrix inversion has low requirements for physical condition, but the amount of calculation is relatively large.; dual-frequency electromagnetic wave method can directly obtain the conductivity distribution, but only for the good conductor case; the applicable situation of neighboring traces method is the most extensive, but it is susceptible to interference.

Key words： cross-hole electromagnetic wave tomography attenuation constant initial amplitude

Received: 23 October 2018 Published: 31 May 2019

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Corresponding Authors: Si-Xin LIU E-mail: liusixin@jlu.edu.cn

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Cite this article:

Jian-Fu NI,Si-Xin LIU. Comparison of initial amplitude estimation methods for cross-hole electromagnetic wave attenuation tomography[J]. Geophysical and Geochemical Exploration, 2019, 43(3): 634-641.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.1377 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I3/634

Model diagram

Observation system

Comparison of attenuation constant model and tomography of three methods
a—attenuation constant model diagram;b—attenuation tomogram of linear fitting method;c—attenuation tomogram of matrix inversion method;d—attenuation tomogram of neighboring traces method

Linear fit graph

Attenuation tomography with known initial amplitude

Comparison of dual-frequency electromagnetic wave method conductivity model and two sets of frequency conductivity tomography results
a—conductivity model diagram in the case of good conductor;b—conductivity tomography of dual-frequency electromagnetic wave method (1 MHz & 1.2 MHz);c—conductivity tomography of dual-frequency electromagnetic wave method (10 MHz & 12 MHz)

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