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Theoretical Study and Numerical Simulation of the Borehole Acoustic Field’s and Seismoelectric Field’s Excited by External Point Force Source

Author: JiangYanJi
Tutor: ZhangYuJun
School: Jilin University
Course: Acoustics
Keywords: Biot medium Shock -electric effect Point force source
CLC: P631.4
Type: Master's thesis
Year: 2010
Downloads: 63
Quote: 1
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Abstract


The shock electric effect , a physical phenomenon unique porous media . The amplitude and frequency of the sound waves and electromagnetic waves excited in the earthquake -electric effect not only the sound waves themselves , but also to the media and reservoir porosity, permeability and reservoir parameters and fluid properties in close contact . Shock electric effect both in theory and has important implications for the field experiment . The main content of this paper is to shock electric effect , well outside the point force source excitation borehole acoustic electric field theoretical study and numerical simulation of the application of pride equations , the pore - media sound - electric coupling equation group transformation for solving scalar and vector Helmholtz equation , write a porous formation and borehole fluid displacement, stress and electromagnetic fields expressions , and out of the shot and the reflection coefficient boundary equation , the solution , and then through the MATLAB programming, numerical simulation and image analysis . Borehole sound well outside the point force source excitation electric field numerical simulation and analysis process , for hard and soft formations , different sources at different frequency, different reception from the simulation and comparative analysis , and discusses the pore degree of penetration , bending , and salinity on the sound of the electric field inside and outside the well . The calculation results in the earthquake -electric effect , the paper compared the numerical results of the partial results of the sound field with not consider Seismoelectric effect when there is no difference . The shock electric effect , well outside the point force excitation source wells sound farm no one has done , to study it , conducive to grasp the sound of a porous formation - the law of propagation of the wave field and features , the results of this study explain cross- the hole seismoelectric observational data has some theoretical significance .

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CLC: > Astronomy,Earth Sciences > Geology > Geology, mineral prospecting and exploration > Geophysical exploration > Seismic exploration
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