Schematic section through the convective cells in the sedimentary and granitic reservoirs. Geothermal fluid circulations are controlled by the fracture network in the Muschelkalk, Buntsandstein, and crystalline basement. During circulation, secondary mineral deposits occur in the fractures (ANH=Anhydrite, QTZ=Quartz, SUL=Sulfides, BAR=barite, CRB=Carbonates). On the sketch, the black dots indicate the vertical evolution of hydrothermal minerals. The uppermost part of the sedimentary cover remains largely conductive and insulates the convective system below. Hydrocarbons (HYB) are mostly located in the Triassic sediments. Temperature values and the salinity of the brine are from the Soultz geothermal wells.