| 位于导电介质中三维导体的电磁响应 |
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| 引用本文： | 靳职理,许洪海.位于导电介质中三维导体的电磁响应[J].地球物理学报,1989,32(4):423-432. |
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| 作者姓名： | 靳职理 许洪海 |
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| 作者单位： | 中国地质大学 北京 |
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| 摘 要： | 本文给出一种用积分方程法配合有限差分法计算位于导电介质中三维导体的电磁响应的新途径,在二层大地条件下给出了具体计算方法和结果。详细讨论了围岩介质的导电性对导体异常的影响。这对于开展低阻覆盖层地区的电磁法工作具有一定的指导意义。
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| 关 键 词： | 三维导体 电磁感应 |
| 收稿时间： | 1987-10-07 |
ELECTROMAGNETIC RESPONSE OF A THREE-DIMENTIONAL CONDUCTOR IN LAYERED EARTHS |
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| JIN ZHI-LI,Xu HONG-HAI.ELECTROMAGNETIC RESPONSE OF A THREE-DIMENTIONAL CONDUCTOR IN LAYERED EARTHS[J].Chinese Journal of Geophysics,1989,32(4):423-432. |
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| Authors: | JIN ZHI-LI Xu HONG-HAI |
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| Institution: | China University of Gcoscienccs, Beijing |
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| Abstract: | This paper presents a new integral equation to describe the EM response of a 3D body in layered earths. The inhomogeneities of the body are replaced by an equivalent current distribution. This current contains both collective and vortex current. A matrix equation is constructed by using the electric tensor Green's function appropriate to a layered earth. We can first obtain vortex current from the primary magnetic field by the finite-difference method. The total scattering current of the body is obtained by solving this equation. Finally, the scattered magnetic fields are found by using the magnetic tensor Green's function.The effects of varying excitation-frequency, conductivities of the host rock and the overburden have been studied in detail for a horizontal loop source fixed on a 2-layered earth with a prismatic inhomogeneity situated in the lower conductive half space. |
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| Keywords: | Three-dimensional conductor Electromagnetic induction |
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