We develop coupled numerical models and determine geomaterial properties to quantify the role of fluid systems of gases, liquids and solids in the dynamic structure of the Earth and for the sustainable utilisation of georesources in view of environmental impacts. We simulate the interaction of fluids and rocks of the shallow to deep geologic subsurface with models and experiments that cover a large range of temperatures and pressures. We couple geochemical reactions with other physical processes with our reactive transport simulation tools to approach hydrogeological challenges.