Assessment of sedimentary geothermal reservoirs in Dezhou, China and Galanta, Slovakia

Abstract

Sedimentary geothermal reservoirs are characterized by large areas, homogeneous aquifers, quite productive wells and great energy potential. Effective methods for sedimentary geothermal reservoir assessment are reviewed along with operational options for geothermal reservoir management with respect to sustainable production of geothermal water. The Dezhou reservoir in China and Galanta reservoir in Slovakia are presented as examples. The Dezhou geothermal system is a typical sedimentary sandstone reservoir, located in an alluvial plain dominated by the Yellow River in China, which is part of the North China Sedimentary Basin. It is an extensive, almost horizontal, highly permeable, low-temperature reservoir. Two successful production wells (DR1 and DR2), with temperatures between 46 and 58°C at depths from 1490 to 1530 m, have been drilled into the reservoir. The properties and parameters of the reservoir are estimated from interpretation of well test data. On the basis of these data, the production potential of the Dezhou reservoir has been estimated ....