Seismoelectric waves in a borehole excited by an external explosive source

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

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.

Keywords: poroelastic wave borehole scattering field explosive source

Received: 24 January 2013
Revised: 27 March 2013
Accepted manuscript online:

PACS:	43.20.+g	(General linear acoustics)
	91.60.Lj	(Acoustic properties)
	91.30.-f	(Seismology)

Fund: 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.

Corresponding Authors: Cui Zhi-Wen
E-mail: cuizw@jlu.edu.cn

Cite this article:

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 2014 Chin. Phys. B 23 014301

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