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《Oil Geophysical Prospecting》 2004-03
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Study on electric azimuth anisotropy of controlled source in frequency domain and near-field effects.

Yue Rui-yong and Xu Yi-xian1200206 Class,Postgraduate Institute of China University of Geologic Science,Wuhan City,Hubei Province,430074,China  
There are the issues of how to divide the near-field from the far-fields when using manual field source for electro-magnetic prospecting.Taking the azimuth-anisotropic and half-infinite earth as a model,the paper yielded the far-field distance (FFD) of ground horizontal electric dipole (HED) by computation,presented taking relative variation η≤5% as the judge condition of dividing the near-field from the far-field.The influence of azimuth-anisotropy on division of the near-field from the far-field has been studied by numeric tests,that resulted in following conclusions:the linear relation between the far-field distance (FFD) and skin effect existed when the anisotropic parameters are certain;the affect of anisotropy on FFD in formation strike is larger than that in its orthonormal direction,the same is true for its value.
【CateGory Index】: P631.3
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