LAGGING AND REACTION KINETIC MECHANISM OF HYDROCARBON REGENERATION FROM ORGANIC MATTERS IN COALS

In this study, the coal sample series are analyzed with both natural and artificial maturity series. Then the pyrolytic simulation method is employed to address the lagging and reaction kinetic mechanism of the hydrocarbon regeneration from the organic matters in coals. This analysis indicates that the initial maturity of the hydrocarbon regeneration increased and the peak maturity of the hydrocarbon regeneration shifted backward in a regular pattern with the "deadline" of this generation standing at about 4.0% (R_o). The difference between the peak and initial maturities of the hydrocarbon regeneration grows in a parabola pattern with the increasing initial maturity. In addition, the absolute and the relative laggings of the hydrocarbon regeneration evolve stage by stage. Therefore, the lagging range of the hydrocarbon regeneration might be forecasted. The stage-like variation of the half-peak width curve of the hydrocarbon regeneration with the initial maturity inferred the location of the initial maturity of the hydrocarbon regeneration in the hydrocarbon source rocks, near the hydrocarbon generation peak, which may yield a relatively great mount of hydrocarbon. At the same time, the mean activation energy of the coal samples with original maturity has evolved through four stages, highly matching the pyrolytic hydrocarbon generation and the stage evolution features of the lagging of the hydrocarbon regeneration. This perfect matching indicates the strict constraint of the geochemical mechanism of the reaction kinetics on the hydrocarbon regeneration.