. Early geophysical papers of the Society of Exploration Geophysicists . limestones, shown in section below Graph No. 10. The results of the measurement are shown in curve 69, which occupies a position es- sentially midway between what would be expected for limestone, lire A A, and for shale, line BB. In other words, the resistivity at the con- tact of two formations should be an average of their resistivities in proportion to the volume of each functioning as a conductor. It is interesting to note that the increase in resistivity is not in proportion to the increase in depth at this particula
. Early geophysical papers of the Society of Exploration Geophysicists . limestones, shown in section below Graph No. 10. The results of the measurement are shown in curve 69, which occupies a position es- sentially midway between what would be expected for limestone, lire A A, and for shale, line BB. In other words, the resistivity at the con- tact of two formations should be an average of their resistivities in proportion to the volume of each functioning as a conductor. It is interesting to note that the increase in resistivity is not in proportion to the increase in depth at this particular station, but that it flattens out. The explanation is that as the depth of current penetra- tion increases, the volume of shale included in the expanding circuit increases relatively at the cost of volume of limestone because of the 571
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