Knowing the present state of the thermal field as well as understanding the coupling between fluid-and heat transport in basins, is of societal relevance in particular for the exploration of energy resources or water. Based on the 3D structural models we test which configuration of thermal properties is consistent with observed temperatures in wells or with heat flow measured at the surface. We predict deep temperature distribution in sedimentary basins by means of 3D numerical simulations to evaluate which heat transport mechanisms are relevant at which scale and address separately the effects of conductive heat transport as well as the coupled transport of heat and pore fluids.