Seismoelectric waves in a borehole excited by an external explosive source

doi:10.1088/1674-1056/23/1/014301

Chin. Phys. B ›› 2014, Vol. 23 ›› Issue (1): 14301-014301.doi: 10.1088/1674-1056/23/1/014301

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

Seismoelectric waves in a borehole excited by an external explosive source

周久光^{a b}, 崔志文^a, 吕伟国^a, 张玉君^a, 王克协^a

a College of Physics, Jilin University, Changchun 130012, China;
b School of Basic Medical, Beihua University, Jilin 132001, China

收稿日期:2013-01-24 修回日期:2013-03-27 出版日期:2013-11-12 发布日期:2013-11-12
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 40974067, 11134011, and 41004044), the State Key Laboratory of Acoustics, Chinese Academy of Sciences (Grant No. SKLOA201108), and the Scientific Forefront and Interdisciplinary Innovation Project of Jilin University, China.

Seismoelectric waves in a borehole excited by an external explosive source

Zhou Jiu-Guang (周久光)^{a b}, Cui Zhi-Wen (崔志文)^a, Lü Wei-Guo (吕伟国)^a, Zhang Yu-Jun (张玉君)^a, Wang Ke-Xie (王克协)^a

a College of Physics, Jilin University, Changchun 130012, China;
b School of Basic Medical, Beihua University, Jilin 132001, China

Received:2013-01-24 Revised:2013-03-27 Online:2013-11-12 Published:2013-11-12
Contact: Cui Zhi-Wen E-mail:cuizw@jlu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 40974067, 11134011, and 41004044), the State Key Laboratory of Acoustics, Chinese Academy of Sciences (Grant No. SKLOA201108), and the Scientific Forefront and Interdisciplinary Innovation Project of Jilin University, China.

摘要/Abstract

摘要： The conversion of energy between seismic and electromagnetic wave fields has been described by Pride’s coupled equations in porous media. In this paper, the seismoelectric field excited by the explosive point source located at the outside of the borehole is studied. The scattering fields inside and outside a borehole are analyzed and deduced under the boundary conditions at the interface between fluid and porous media. The influences of the distance of the point source, multipole components of the eccentric explosive source, and the receiving position along the axis of vertical borehole, on the converted waves inside the borehole are all investigated. When the distance from the acoustic source to the axis of a borehole is far enough, the longitudinal and coseismic longitudinal wave packets dominate the acoustic and electric field, respectively. The three components of both electric field and magnetic field can be detected, and the radial electric field is mainly excited and converted by the dipole component. Owing to the existence of borehole, the electric fields and magnetic fields in the borehole are azimuthal. The distance from the point where the maximum amplitude of the axial components of electric field is recorded, to the origin of coordinate indicates the horizontal distance from the explosive source to the axis of vertical borehole.

关键词: poroelastic wave, borehole, scattering field, explosive source

Abstract: The conversion of energy between seismic and electromagnetic wave fields has been described by Pride’s coupled equations in porous media. In this paper, the seismoelectric field excited by the explosive point source located at the outside of the borehole is studied. The scattering fields inside and outside a borehole are analyzed and deduced under the boundary conditions at the interface between fluid and porous media. The influences of the distance of the point source, multipole components of the eccentric explosive source, and the receiving position along the axis of vertical borehole, on the converted waves inside the borehole are all investigated. When the distance from the acoustic source to the axis of a borehole is far enough, the longitudinal and coseismic longitudinal wave packets dominate the acoustic and electric field, respectively. The three components of both electric field and magnetic field can be detected, and the radial electric field is mainly excited and converted by the dipole component. Owing to the existence of borehole, the electric fields and magnetic fields in the borehole are azimuthal. The distance from the point where the maximum amplitude of the axial components of electric field is recorded, to the origin of coordinate indicates the horizontal distance from the explosive source to the axis of vertical borehole.

Key words: poroelastic wave, borehole, scattering field, explosive source

中图分类号: (General linear acoustics)

43.20.+g

91.60.Lj (Acoustic properties) 91.30.-f (Seismology)

周久光, 崔志文, 吕伟国, 张玉君, 王克协. Seismoelectric waves in a borehole excited by an external explosive source[J]. Chin. Phys. B, 2014, 23(1): 14301-014301.

Zhou Jiu-Guang (周久光), Cui Zhi-Wen (崔志文), Lü Wei-Guo (吕伟国), Zhang Yu-Jun (张玉君), Wang Ke-Xie (王克协). Seismoelectric waves in a borehole excited by an external explosive source[J]. Chin. Phys. B, 2014, 23(1): 14301-014301.

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Seismoelectric waves in a borehole excited by an external explosive source

Seismoelectric waves in a borehole excited by an external explosive source

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