Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 144 C. A. HEILAND shows two resistivity profiles with the corresponding drilling results. In interpreting the resistivity curves, reference should be made to the curves shown in Figure 16 for the case in which the resistivity of the lower layer is practically infinite. The two curves shown in Figure 27 also illustrate the effect of a homogeneous and an inhomogeneous overburden. ^-As-â £Qu>*fsssrss/rr ever* /wo Ml&e ^C#L£'â¢â â Fig. 28.âResistivity map
Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 144 C. A. HEILAND shows two resistivity profiles with the corresponding drilling results. In interpreting the resistivity curves, reference should be made to the curves shown in Figure 16 for the case in which the resistivity of the lower layer is practically infinite. The two curves shown in Figure 27 also illustrate the effect of a homogeneous and an inhomogeneous overburden. ^-As-â £Qu>*fsssrss/rr ever* /wo Ml&e ^C#L£'â¢â â 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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