ASGP (2025), vol. 95: 243–254

HYDROGEOLOGICAL PROPERTIES OF THE MATRIX IN UPPER JURASSIC LIMESTONES (OLKUSZ AND KRAKÓW AREA, POLAND)

Jacek MOTYKA, Kajetan D’OBYRN & Adam POSTAWA (*)

AGH University of Krakow, Faculty of Geology, Geophysics and Environmental Protection, Mickiewicza 30, 30-059 Kraków, Poland; e-mails: motyka@agh.edu.pl, dobyrn@agh.edu.pl, postawa@agh.edu.pl
*) Corresponding author

Motyka, J., d’Obyrn, K. & Postawa, A., 2025. Hydrogeological properties of the matrix in Upper Jurassic limestones (Olkusz and Kraków area, Poland). Annales Societatis Geologorum Poloniae, 95: 243–254.

Abstract: Quantitative description of the rock pore space properties provides important data for considerations, related to the quantitative description of mass transport or estimation of the aquifer’s resources. Carbonate rocks are characterized by a particularly complex groundwater flow system. The hydraulic network in these rocks consists of three types of voids: pore space (matrix), fractures and caverns. The authors present the results of research on selected hydrogeological parameters of the Jurassic rock samples, taken from drill cores in the Olkusz region and Kraków (southern Poland). The values of porosity, hydraulic conductivity, specific yield and relative drainability were determined; 159 samples from the Olkusz region and 90 samples from the Kraków region were tested. The porosity of the tested samples varied from 0.64% to 21.9% for the Olkusz region and 0.62%–9.6% for Kraków. Hydraulic conductivity ranged from 2.52×10–12 m/s to 1.53×10–9 m/s for the Olkusz region and from 5.40×10–12 m/s to 9.06×10–7 m/s for Kraków and the specific yield from 0 to 0.0123 for the Olkusz region and from 0.00051 to 0.00737 for Kraków. There were no statistically significant relationships between the values of individual parameters for samples, tested perpendicular and parallel to the direction of drilling the test borehole in the case of samples from the Olkusz area. In the case of samples from Kraków, there was a weak, but statistically significant correlation between specific yield vs porosity, and the correlation between specific yield vs hydraulic conductivity

Manuscript received 15 October 2025, accepted 5 December 2025