Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists . earlygeophysical00soci Year: 1947 ELECTRICAL PROSPECTING 17 about one twentieth of the effect at 100 cycles. This curve illustrates the im- portance of using a low frequency alternating current. P-3 A Fig. 8. Power ratio curves for long line. WOO 2O0O 3000 MET. Fig. 9. Electromagnetic survey across a salt dome. In order to illustrate the results that may be obtained in the field by a good electrical survey under favorable conditions, two surveys made by the Swedish American Prospecting Co
Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists . earlygeophysical00soci Year: 1947 ELECTRICAL PROSPECTING 17 about one twentieth of the effect at 100 cycles. This curve illustrates the im- portance of using a low frequency alternating current. P-3 A Fig. 8. Power ratio curves for long line. WOO 2O0O 3000 MET. Fig. 9. Electromagnetic survey across a salt dome. In order to illustrate the results that may be obtained in the field by a good electrical survey under favorable conditions, two surveys made by the Swedish American Prospecting Corporation for the Gulf Oil Corporation will 161
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