Thermal conductivity is a cruicial property of geothermal and other applications like tunneling or geological/thermal modelling. It is hardly possible to measure thermal conductivity directly in the borehole, therefore most data available are laboratory data. Therefore the correlation between thermal conductivity and other petrophysical parameters (here: electrical resistivity) are used for a derivation of a “thermal conductivity” log for carbonates. Thermal conductivity is calculated using an inclusions model, in contrast to the electrial resistivity where the Archie equation is used. Out of the calculations two petrographic coded equations resulted. Different pore spaces and the petrographic code is demonstrated using different values for m (empirical Archie exponent) depending on the rock type. The derived euaqtions give us the possibility to derive a “thermal conductivity” log out of a resistivity log. Two examples show for different carbonates (petrographic code) that the equations can be easily applied for thermal conductivity estimation, when logs of electrical rock resistivity and resistivity of the water are present. The mean log-derived thermal conductivity values from the logs fit well to the measured data at outcrop samples of the same rock type.


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