Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 ADVANCES IN OIL PROSPECTING 149 prevails between the curves of 43, 44, 45, and 46. Particularly, 43 is very similar to 44, and 45 very similar to 46. Corresponding with the bottom of the first red-bed layer, all the curves mentioned have the same appearance, which becomes less pronounced toward the north- east, but may yet be recognized very faintly in curve 49. Therefore, Jttt Minn 'l *tivt 'A m,/e Strut turf Fig. 33.—Results of potential-drop-ratio observ
Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 ADVANCES IN OIL PROSPECTING 149 prevails between the curves of 43, 44, 45, and 46. Particularly, 43 is very similar to 44, and 45 very similar to 46. Corresponding with the bottom of the first red-bed layer, all the curves mentioned have the same appearance, which becomes less pronounced toward the north- east, but may yet be recognized very faintly in curve 49. Therefore, Jttt Minn 'l *tivt 'A m,/e Strut turf Fig. 33.—Results of potential-drop-ratio observations and corresponding structure at Berthoud dome, Colorado. the writer has- used that particular part of the curve as horizon marker for the resistivity correlation. It is seen that the resistivity contour thus obtained is not everywhere in accord with the logs, but that it checks very well with the structure correlation made on top of the salt beds. The next two figures, 32 and ^^, show some results which were obtained with the single-probe and the potential-drop-ratio 479
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