Numerical Simulation of Shear-Horizontal-Wave-Induced Electromagnetic Field in Borehole Surrounded by Porous Formation
Numerical Simulation of Shear-Horizontal-Wave-Induced Electromagnetic Field in Borehole Surrounded by Porous Formation
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DOI：
10.1088/0256-307x/24/12/045
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发表时间：
2007-12
影响因子：
3.5
通讯作者：
Cui Zhi-Wen;Wang Kexie;S. Jianguo;Zhu Zheng-ya;Yao Gui-Jin;Hu Hengshan
中科院分区：
文献类型：
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作者：
Cui Zhi-Wen;Wang Kexie;S. Jianguo;Zhu Zheng-ya;Yao Gui-Jin;Hu Hengshan
考虑了直接作用在井壁上的纯扭转载荷激发的地震电场。简要的公式和一些计算波形显示了使用剪切水平（SH）横向电（TE）地震电波测井测量流体饱和多孔地层中的剪切速度的优点。在假设声场不受震电效应引起的电磁场影响的前提下，将电磁场的耦合控制方程化为含有传播电流源的麦克斯韦方程组。结果表明，这种简化是有效的，井中震电转换效率主要取决于动电耦合系数。在SH-TE地震电波测井中，接收器可以放置在井液中，探测转换电磁场，获得横波速度。
Seismoelectric field excited by purely torsional loading applied directly to the borehole wall is considered. A brief formulation and some computed waveforms show the advantage of using shear-horizontal (SH) transverse-electric (TE) seismoelectric waves logging to measure shear velocity in a fluid-saturated porous formation. By assuming that the acoustic field is not influenced by its induced electromagnetic field due to seismoelectric effect, the coupling governing equations for electromagnetic field are reduced to Maxwell equations with a propagation current source. It is shown that this simplification is valid and the borehole seismoelectric conversion efficient is mainly dependent on the electrokinetic coupling coefficient. The receivers to detect the conversion electromagnetic field and to obtain shear velocity can be set in the borehole fluid in the SH-TE seismoelectric wave log.