Jurajskie solanki termalne Polski północnej i zachodniej

Abstract

JURASSIC THERMAL BRINES IN NORTH AND WEST POLANDSummaryThe present paper deals with the results obtained by deep bore holes in the northern and western parts of the Polish Lowland area. A great demend for thermal water in the regions lacking health resorts forced to make prospections and, consequently, allowed the geologists to hand over the Jurassic thermal waters found in bore holes Środa 2 and Jamno 3 to the Ministry of Health.The regions of thermal water occurrences depend upon thermal gradient, yield of water-bearing horizons and pressure conditions.The best conditions for an intake of thermal waters are found in the north-eastern part of the Fore-Sudetic monocline, where spontaneous outflow of hot water (37.3°C–40°C) has been obtained, characterized by an efficiency of 18–40 m3/h.In the north-western areas of Poland, within the seaside zone, a spontaneous outflow of hot water under worse geothermal conditions has been observed. Temperature was 23­–26°C, and yield amounted to 10–18 m3/h.The most unfavorable geothermal conditions are observed to occur in the north-eastern areas of Poland. These are thought to be due to the shallow-seated crystalline basement. It is expected, however, that a possibility exists of discovering hot mineral water in the central part of the Peri-Baltic syneclise, as well.