| Abstract |
The understanding of the properties and behaviour of geothermal reservoirs is the essential condition for the dimensioning of subsurface installations on a geothermal site. In the course of the individual stages of site planning, any prognosis is based on geological models and mathematical-physical simulations. With the knowledge of the geological conditions increasing in the process of reservoir exploration, geological models and simulations will more and more reflect reality. This paper describes the quantification of the main geological parameters, their sensitivity and effects on the simulation results for a Mesozoic sandstone aquifer which is used for geothermal energy exploitation on a site in Northern Germany. There are considered all stages ranging from initial planning to plant operation. During operation, the injection of cooled thermal water has an effect on the temporal and spatial distribution of the hydraulic conductivity of the thermally influenced reservoir. The permanent recording of the pressure at the injection well head - which is the total of the pressure response of the aquifer, the loss due to tube friction and replenishment of the water column in the well - is to reflect this effect. Although the paper deals with a specific reservoir in the North German Basin, conclusions with regard to the reliability of parameters, the interpretation of the operational data and the applied methodology may well be generalised. |