[en] A multi-criteria approach was used to draw up an atlas of the energy resources of the main 'accessible' groundwater aquifers in the Lorraine region. This was made possible by the use of a geographic information system to characterize the Tithonian limestone, Oxfordian limestone, Dogger limestone, Muschelkalk limestone and Lower Triassic sandstone aquifers. The parameters taken into account are varied. They reflect the hydrodynamic characteristics of the aquifers and the qualitative characteristics of the associated water tables. For some parameters, and flow rates in particular, the lack of available data meant that it was not possible to sort them systematically, which sometimes led to processing difficulties. As an atlas is, by definition, made up of maps, particular attention was paid to the mapping of parameters, ensuring that a consistent scientific approach was always followed. The spatial variability of parameters was therefore studied. For most aquifers, geostatistical kriging of parameters was carried out. However, the flow rate results obtained from the study are only indicative. The atlas is in fact a decision-making tool for very low-energy geothermal energy, providing guidance on the potential for exploiting the aquifers. The following points in particular must be taken into account, as they may limit the precision of variographic analysis and the quality of interpolations: - carbonate formations are heterogeneous (fissured or even karstified), and so are the flow data collected; - the flow estimates do not take into account the interference between pumping operations. As a result, the flow interpolation results may not be representative of reality. In any case, these results do not constitute a project feasibility study. In addition, the existence of zones restricting use or works (as in the case of drinking water supply catchment protection zones, for example), and the possibility of a water table being in disequilibrium (as in the case of the Lower Triassic sandstone water table, which is overexploited), must be taken into account in a project. Once these restrictions on use have been taken into account, a heat pump potential map has been produced for each of the five aquifers. These documents have been standardized by the same reference, and presented according to a single scale of results, so that they can be compared. Finally, when several aquifers coexist, the atlas can be used to direct the reader towards the most interesting groundwater resource