Electroseismic waves excited by vertical magnetic dipole in borenole |
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Authors: | Zhiwen Cui Jinxia Liu Guijin Yao Kexie Wang |
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Institution: | 1.Department of Acoustics and Microwave Physics, College of Physics,Jilin University,Changchun,China;2.The College of Communication Engineering,Jilin University,Changchun,China |
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Abstract: | Acoustic and electromagnetic fields are coupled in a fluid saturated porous medium due to seismoelectric effect. Seismoelectric
well logging method has been proposed to detect deep target formation utilizing such effect. Because of uncoupling of SH waves
with P-SV waves, a simple and forthright way to get shear waves information is possible, especially for soft or slow formation
whose shear wave velocity is lower than the velocity of borehole fluid. We consider the wave fields excited by a vertical
magnetic dipole (VMD) source. Two methods are used to simulate, one is the coupled method based on Pride model and the other
is the uncoupled method. For two methods, the frequency wavenumber domain representations of the acoustic field and associated
seismoelectric field are formulated. The full waveforms of acoustic waves and electromagnetic wave induced SH waves excited
by VMD source in the time domain propagation in borehole are simulated and analyzed. |
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