3:00 PM - 4:00 PM
[S24-P-04] Temperature and heat-flow calculations: about the benefit of well-log based thermal-conductivity profiles
The new set of prediction equations is universally applicable for all major types of sedimentary rocks (clastics, carbonates and evaporites) and allows calculating continuous thermal-conductivity profiles from different combinations of standard geophysical well-logs (i.e. density, hydrogen index, sonic interval transit time, gamma-ray response, photoelectric factor). The combination of three to five well-log parameters results in absolute predictions uncertainties of <15% on a synthetic test data set and of <20% on benchmark laboratory data (Fuchs et al., 2015). However, mean values for geological formations upscaled from laboratory data can be fitted by well logs with uncertainties of approx. 5-7%.
Based on borehole conductivity profiles from various boreholes, we demonstrate the calculation of temperature and heat-flow profiles with absolute errors <3 degC compared to measured temperature logs along boreholes of several kilometers length.