Borehole Model in a Horizontally Layered Strata

Zhenya Zhu,M. Nafi Toksoz, Matthijs W. Haartsen

Seismoelectric ExplorationGeophysical Monograph Series(2021)

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Theoretic and experimental studies show that there are two kinds of seismoelectric signals that can be induced with acoustic waves. A propagating seismic wave can generate the seismoelectric and seismomagnetic fields in a homogeneous porous medium; propagating seismoelectric EM waves can be generated at an interface or through a heterogeneous medium. An electrode, used as a receiver on the ground surface, can detect the propagating EM wave generated at an interface in the formation, but cannot detect the seismoelectric field generated inside a homogeneous formation. When the electrode is in a fluid-saturated borehole and close to a porous formation, it can detect both the EM waves and the seismoelectric field. Seismoelectric measurements are performed with borehole models made of natural rocks or artificial materials. The acoustic waveforms and electric signals received by acoustic receiver and electrode are generated by an acoustic source in the same borehole. We calculate the seismoelectric amplitudes are normalized by the corresponding acoustic amplitudes. The normalized seismoelectric amplitudes show different properties from the traditional acoustic well logging. Comparison of the waveforms of the seismoelectric signals and acoustic logging waveforms suggests that seismoelectric well logging may explore the different properties of the formation. The seismoelectric logging might be a new logging method for directly exploring the physical properties related to fluid flow in a formation.
horizontally layered strata
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