Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 156 C. A. II EI LAND productive horizon both are seen to decline rapidly in resistivity toward the edge of the productive zone. I ! a i Bf | ! ! Fig. 37.—High resistivity of two producing sands, Wewoka field, Seminole area, Oklahoma, 1929. (Peney Reed No. 1.) (After Schlumberger.)

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