Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 32 C. E. VAN ORSTRAND solution of the problem can be obtained by constructing the isogeo- therms. By proceeding in this way, Strong (34) has shown that the general effect of a poorly conducting disk is to increase the gradients immediately above and below the disk. Let us now attempt to estimate the rate at which heat must be developed by chemical reactions within the disk in order to maintain the differences in the values of the reciprocal gradients (i/b) wh
Early geophysical papers of the Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 32 C. E. VAN ORSTRAND solution of the problem can be obtained by constructing the isogeo- therms. By proceeding in this way, Strong (34) has shown that the general effect of a poorly conducting disk is to increase the gradients immediately above and below the disk. Let us now attempt to estimate the rate at which heat must be developed by chemical reactions within the disk in order to maintain the differences in the values of the reciprocal gradients (i/b) which were found at Haverhill. The mean of the two reciprocal gradients on the producing area is feet per °F, which compared with the one Fig. 12.—Rise in temperature due to heat source at 1,500 meters (4,921 feet). obtained on the nonproducing area, feet per °F., corresponds with a temperature difference of F. ( C.) at a depth of 762 meters, 2,500 feet. From the diagram (Fig. 12), (35) the maximum rise in temperature due to a heat source at a depth of 762 meters is about C, and as is also shown in the diagram, this constant tem- perature difference can be maintained by the generation q of 1X io-7 calories .per square centimeter per second, or, calories per square centimeter per year (2,932 calories per square foot per year) in a thin stratum of rock. As the value, C, is a sufficiently close approxima- tion to the value C, it may be assumed that the value of q has been determined with sufficient accuracy for our purpose. Let us now estimate for comparison with our calculated value of q, the quantity 554
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