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Measurement of electromagnetic fields over a small electrolytic tank.

机译：测量小电解槽上的电磁场。

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摘要

In 1986, Hart proposed a large, hemispherical electrolytic tank and the use of the Surface Electrical Potential method with which to study resistivity changes due to energy-extraction processes in the earth. A second method for the inference of underground resistivity changes, the Controlled Source Audio-MagnetoTelluric method, has been widely used in the field. This method uses measurements of the electromagnetic field from a surface dipole, rather than the surface potential distribution from a buried vertical electrode, as the basis of the technique. If both SEP and CSAMT could be applied to the same model structure in the same electrolytic tank, it would seem that the diagnostic information would be enhanced over the use of each technique separately. Accordingly, the specific objectives were: to determine to what radial extent the bowl could be used as a homogeneous half-space; and to demonstrate acceptable accuracy by measuring the effect of a conducting target immersed in the bowl and comparing the measurements with numerical modeling. Electromagnetic fields over an electrolytic tank have been measured by others, and this report begins with a comparative summary of both prior and present work. The next section presents the formulas for the electromagnetic fields, and explains the choice of a particular method of measuring apparent resistivity. The field theory is also used in the subsequent section to provide error estimates needed for design guidance. The following sections describe the measurements, and the considerations for a larger facility. The appendices include the derivatives of the fields, the electrolyte characteristics, a description of the apparatus, and calibration methods. 24 refs., 26 figs.

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