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METHOD FOR CALCULATING ELECTROMAGNETIC FIELDS FROM A SOURCE THAT UTILIZES A CONDUCTING CASING OF A BOREHOLE
METHOD FOR CALCULATING ELECTROMAGNETIC FIELDS FROM A SOURCE THAT UTILIZES A CONDUCTING CASING OF A BOREHOLE
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机译:利用电导率套管的源计算电磁场的方法
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摘要
A method for efficiently calculating a subsurface distribution of electrical resistivity or conductivity generated by an electromagnetic (EM) source is provided wherein a significant fraction of the electric current produced by a source flows along a casing of a borehole. The method is comprised of two steps: calculating EM fields produced by the casing in the background lithology; and calculating EM fields caused by a resistivity anomaly in the presence of an EM field produced by the casing within a subsurface or survey model that does not include the casing.
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