A method of determining terrestrial heat flow in oil fields from bottom-hole temperatures, electric logs, and thermal conductivity of core samples has been tried in six Reconcavo Basin oil fields in Brazil. The average heat-flow value so determined for the Reconcavo Basin is 1.10 + or - 0.15 microcalories/cm 2 sec. The technique can be used for calculating heat flow in continental areas elsewhere. A more significant outcome of our experiment is that it demonstrates an inexpensive method of obtaining terrestrial heat-flow values in the sedimentary basins of the world.

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