Thermogenic Gases Generated From Coals And Carbonaceous Shales Of The Upper Silesian And Lublin Coal Basins: A Hydrous Pyrolysis Approach

In order to provide a better characterization of the origin and volume of thermogenic gas generation, hydrous pyrolysis (HP) experiments were performed on coals and carbonaceous shales of the Upper Silesian and Lublin Coal Basins at 330 and 360 degrees C for 72 h. The maturity range of coals and shales used for HP varies from 0.57 to 0.92% R-o. The maturity increase caused by HP at 330 and 360 degrees C ranges from 1.32 to 1.39% and from 1.71 to 1.83%, respectively. The delta C-13 of CH4 , C2H6, C3H6 and n-C4H10 in gases versus their reciprocal C-number have a concave relationship, and therefore do not follow a linear trend. The delta H-2 of CH4, C2H6 and C3H6 in gases versus their reciprocal H-number show both linear and convex-concave relationships. The growth of CO2 yields during HP was higher for shales than for coals. H2S yields from shales are higher than from coals, which can be associated with the catalytic and adsorbed influence of the shale matrix. H-2 was also generated in considerable quantities from water and organic matter in the coals, and in larger amounts from the shales. N-2 yields grow with an increase in R-o after 360 degrees C HP and are more enriched in the N-15 isotope than after 330 degrees C.