Study cases of thermal conductivity prediction from P-wave velocity and porosity

•Lab data from two reservoirs: porosity, VP and thermal conductivity (TC).•TC predictions based on: Archie and a new model using VP and porosity only. TC prediction=TC laboratory in dry conditions.•TC prediction.•10–30% TC laboratory in wet conditions.•TC prediction from mineralogy details=TC prediction from new model. Laboratory measurements of porosity, P-wave velocity and thermal conductivity from samples from two geothermal reservoirs in France and Australia are compared to the predictions from different models involving mineralogical considerations, and effective medium theory models yields