Permian deposits are main hydrocarbon source rocks in current petroleum exploration in the Junggar and Turpan-Hami (Tuha) basins, and their understanding is directly concerned with petroleum potential evaluation in the region. Analysis of the total amount of global organic carbon, size of the lake basins and organic geochemistry of crude oil and source rocks shows that there exists no megalake basin in this region but only a large inland lake composed of a number of sub-basins.
The results of a heat-conduction experiment with a central point source in a sand barrel shows that the temperature of the heat source increase much faster in sand saturated with oil and air （dry sand） than in water sand. During cooling the temperature of the central heat source goes down slower in oil- or air-saturated sands than in water sands. Based on the theory of heat-conduction in porous media and the experimental results, we developed a new heat-conduction logging technique which utilizes an artificial heat source （dynamite charge or electric heater） to heat up target forma- tions in the borehole and then measure the change of temperature at a later time. Post-frac oil production is shown to be directly proportional to the size of the temperature anomaly when other reservoir parameters are fairly consistent. The method is used to evaluate potential oil production for marginal reservoirs in the FY formation in Song-Liao basin of China.
