Five medium metamorphosed coals from the south-western part of the Upper Silesian Coal Basin were subjected to sorption and petrographic studies to det. the variability of porosity, degree of coalification, content of main maceral groups and sorption capacity with increasing seam depth. Obtained decrease of the sorption capacity of coal and increase of the MeH pressure in deeper coal seams had an impact on the enhanced coal-bed MeH recovery planning.