Significance of hydrogen and gaseous hydrocarbon in study of coal-type gas generation and evolution

Using thermo-simulative experiment method, the abundance of hydrogen and gaseous hydrocarbon in two series (Y and Z series) of dissolvable or non-dissolvable organic-matter is researched. The results indicated that lignite produces a large amount of hydrogen and gaseous hydrocarbon during its degradation, but there are contradictory relations between them, the gaseous hydrocarbon promotes the formulation of the hydrogen, too, while consuming hydrogen. The contradiction relations reflect reaction relation of two polarization between polycondesation and splitting decomposition during thermo-degradation exactly; the difference of output about hydrogen, gaseous hydrocarbon and dissolvable organic-matter in two series at different temperatures segment also displace the otherness between polycondesation and splitting decomposition reactions and the phase predominance of reaction during kerogen degradation at different temperature segment. This is an important aspect to study coal chemical reaction and relation with coal-type gas while geological geochemistry evolves, and the new theoretical foundation for study of thermo-degradation mechanism of kerogen and evolving rule of coal-type gas were offered.