ŚRODOWISKO HYDROGEOLOGICZNE UTWORÓW BADENU ZACHODNIEJ CZĘŚCI ZAPADLISKA PRZEDKARPACKIEGO

Abstract

HYDROGEOLOGICAL ENVIRONMENT OF THE BADENIAN FORMATION IN THE WESTERN PART OF THE CARPATHIAN FOREDEEP

Abstract. Hydrogeological environment of the Badenian molasse formation in the south-western part of the Upper Silesian Coal Basin is described in this paper. Groundwater environment was analysed taking into account the geological structure of the sedimentary basin, hydraulic properties of rocks, development of hydrodynamic field and the results of hydrochemical, isotopic and dissolved gases investigations. Hydrodynamic and hydrochemical zonation is typical of sedimentary basins. Hydrochemical zonation of the study area is characterized by the increase of water mineralization with depth from 0.9 to 57 g/dm³, and the water chemical type change: HCO₃–Cl–NaCl–NaCl–Na–Ca. Within the horst structures where thickness of the Badenian formation is reduced, a gravitational flow system takes place. In the tectonic grabens, at the depth below 500 m, buried synsedimentary waters were discovered.