Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 ADVANCES IN OIL PROSPECTING 137 on the operation of these ratiometers and their theory, the publica- tion by Edge and Laby (pp. 50-54, and 268-274) (ref. list No. IV3) should be consulted. Fig. 25.—View of ratio compensator. III. INTERPRETATION Methods of interpretation of potential-drop-ratio results have been worked out in a general way for Koenigsberger's and for the Swedish American methods. The results of the computations show that Koenigsberg
Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 ADVANCES IN OIL PROSPECTING 137 on the operation of these ratiometers and their theory, the publica- tion by Edge and Laby (pp. 50-54, and 268-274) (ref. list No. IV3) should be consulted. Fig. 25.—View of ratio compensator. III. INTERPRETATION Methods of interpretation of potential-drop-ratio results have been worked out in a general way for Koenigsberger's and for the Swedish American methods. The results of the computations show that Koenigsberger's method is, in a number of ways, at a disadvantage as compared with the Swedish method, because bis ratios are only opposite but not equal for good and poor conductors which have the same conductivity ratio. What is meant by this is the following: If we form, for a 2-layer problem, the ratio of the conductivity of the surface layer to the con- ductivity of the lower layer, then the potential-drop ratio in Koenigs- berger's method is if the conductivity ratio is one (homogeneous ground). However, if the conductivity ratio is 10:1, the potential ratio decreases only to , whereas, in the converse case (if the con- ductivity ratio is 1: 10) the potential ratio is (Fig. 40 c). Thus, it is seen that in his method the potential-drop-ratio responses are not symmetrical around the position, and that the influence of good 467
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