Acousto-electric well logging by eccentric source and extraction of shear wave
Cui Zhi-Wen(崔志文)a)c)†, Wang Ke-Xie(王克协)a), Hu Heng-Shan(胡恒山)b), and Sun Jian-Guo(孙建国)c)
a Department of Acoustics and Microwave Physics, School of Physics, Jilin University, Changchun 130021, China; b Department of Astronautics and Mechanics, Harbin Institute of Technology, Harbin 150001, China; c College of Geoexploration Science and Technology, Jilin University, Changchun 130026, China
Abstract The nonaxisymmetric acousto-electric field excited by an eccentric acoustic source in the borehole based on Pride seismoelectric theory is considered. It is shown that the acoustic field inside the borehole, converted electric and magnetic fields and coupled fields outside the borehole are composed of an infinitude of multipole fields with different orders. The numerical results show that both the electromagnetic waves and the seismoelectric field in the borehole, and the three components of both electric field and magnetic field can be detected. Measurements on the borehole axis will be of advantage to determining shear velocity information. The components of the symmetric and nonsymmetric acoustic and electromagnetic fields can be strengthened or weakened by adding or subtracting the two full waveforms logged in some azimuths. It may be a new method of directly measuring the shear wave velocity by using the borehole seismoelectric effect.
Received: 06 June 2006
Revised: 12 September 2006
Accepted manuscript online:
Fund: Project supported by National Natural Science Foundation of China
(Grant Nos 10534040 and 10272038) and Doctorate Foundation
of the State Education Ministry of China
(Grant Nos 20040183045 and 20030183052).
Cite this article:
Cui Zhi-Wen(崔志文), Wang Ke-Xie(王克协), Hu Heng-Shan(胡恒山), and Sun Jian-Guo(孙建国) Acousto-electric well logging by eccentric source and extraction of shear wave 2007 Chinese Physics 16 746
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