Abstract
Summary An experiment of heat-conduction with a central point source in a sand barrel has been completed. The results show that in a heating process, temperature of the central heating source goes up much faster as the sand saturated with oil or air (dry sand) than that with water. In contrast to a cooling process, the temperature of central hot source goes down slower in oil or air (dry) sands than in water sands. Based on these results and analysis on theories of heat-conduction in porous medium, we developed a new heat-conduction logging technique: utilize artificial heat source (dynamite charge or electric heater) to heat up target formations in the borehole, then monitoring the dynamic change of temperature. Based on measured data, we have developed a method to analyze thermal conductivity of rock formation and evaluate gas and oil saturation and production potential. Initial test suggests that the technique can be applied to evaluate oil or gas production potential from reservoirs with poor oil or gas showing, using conventional logs.
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