PRACTICAL EXPERIENCE IN THE REINJECTION OF THERMAL WATERS INTO SANDSTONE

摘要

Intensive investigations into the utilisation of the geothermal potential in the North German Basin began in the early 1980s. The first production and reinjection tests from / into sandstone reservoirs started in 1982 and led to the commissioning of the first geothermal heating plant for heat supply to a residential area in the town of Waren (Miiritz) in 1984. More plants were put into operation in Neubrandenburg, Neustadt-Glewe, Berlin, and Neuruppin. More and more sites and plants are being prepared for geothermal heat and power generation in Germany. The use of these sandstone reservoirs for heat storage produced new technical solutions. A precise knowledge of the geological and geochemical conditions forms an essential prerequisite for the successful planning, construction and operation of geothermal plants. Percolation experiments, geochemical and hydraulic-numerical modelling as well as their combinations are applied for this purpose. This paper describes the geological and geochemical conditions as well as the technical solutions and practical experience acquired so far.