ABSTRACT: In the framework compiling of the map file of the geological factors of the environment of the region Lučenec and Rimava basin was compiled Specific hydrogeological map, too. Szecseny schlier of the Lučenec formation takes 12 % of the area (149 km2) on the surface. Szecseny schlier plays significant role on the geological building of the Lučenec and Rimava basin, especially under surface. It underlies almost the whole area of the Lučenec and Rimava basin. It belongs to the potential localities for building deep radioactive waste deposit because of not only it is impermeable rock, but it’s thickness is to 1200 m and it is not too tectonically faulted. After statistical analysis (47 boreholes) we found out that geometric mean of the coefficient of transmissivity is relatively high (6,3.10-5 m2.s-1). Consequently we made 8 statistical files (criterion: deep of center of test parts, probable groundwater inflow in well from other rocks) and we compared their statistical parameters.