Abstract
A total of 6540 bottom-hole temperature values from 1879 petroleum exploration wells in northwestern Alberta in the region 57°N–60°N and 114°W–120°W have been used to estimate temperature gradients there. A thermal gradient contour map constructed for the region shows a number of local high geothermal gradient areas. Comparison with available aeromagnetic and gravity maps indicates that a high geothermal gradient near Steen River is probably associated with an igneous intrusion and that nearby high geothermal gradient areas may be due to the transport of heat away from the basement by upward and lateral water motion. Also, it is noted that, in this region of Alberta, oil field locations appear to coincide with areas of low geothermal gradient, whereas gas fields appear to coincide with high geothermal gradients.
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