Geochemical Modeling

The behaviour of geothermal fluids resulting from temperature and pressure decrease as well as the relevant fluid-rock interactions are documented in geochemical studies. On that basis, requirements can be set on the mode of operation and the construction of geothermal systems (material selection, pressurization).

Based on real water analyses or a prognosticated fluid composition, geochemical analyses are performed by means of various computer programmes, e.g., PhreeqC, allowing the modeling of the solution and precipitation potential of the waters in the individual phases of the operation. In this way, the impacts on the aquifer and the surface system can be predicted. On the basis of these modelings, the selection of the thermal loop materials can be optimized and the system pressures needed for the operation can be determined. In addition, it is necessary to determine the possible maximum and minimum injection pressures. 

GTN offers the overall range of geochemical modeling:

  • Recording and verification of water- and gas-chemical data
  • Prognosis of fluid and gas composition
  • Geochemical modeling of the fluid-mineral equilibria
  • Precipitation and solution behaviour of waters under changing p/T conditions
  • Calculation of relevant physical parameters (density, viscosity, etc.)
  • Calculation of the ex-solving pressures according to the composition and concentration of the gases
  • Requirements on the operation of geothermal systems (pressures, temperatures, material selection

Minerals are in a geochemical equilibrium with the groundwater in the aquifer. As the temperature and pressure conditions are changed in geothermal operation, minerals tend to precipitation or waters to corrosion. Geochemical modeling depicts these processes.  

Marco Wunsch

+49 395 36774 - 36