. Early geophysical papers of the Society of Exploration Geophysicists . Fig. 28.âResistivity map of the Aricesti anticline. Work carried out in 1923 (after Schlumberger). 3. BY POTENTIAL AND PHASE MAPPING This method will probably find little application in oil structural work, although it can give valuable indications in determining the character of surface formations in suitable areas under a shallow cover. Figure 19 shows, as an example, the effect of a gabbro intrusion with two ore bodies on the contact zone upon the potential-drop and 474

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