氢气和气态烃在煤成气形成演化研究中的意义

用热模拟实验方法,对有可溶有机质和无可溶有机质的Y、Z两个系列气态产物中氢气和气态烃丰度变化进行了研究。结果表明,褐煤在降解过程中产生大量氢气和气态烃,在它们之间存在着相互矛盾的关系,气态烃在消耗氢气的同时也促进氢气的生成,这种矛盾关系恰恰反映了热降解过程中缩聚和裂解两极分化的反应关系;两系列不同温度区间氢气、气态烃、可溶有机质产量差值的变化,也显现出干酪根在不同温度段降解过程中缩聚和裂解反应的差异性和反应的阶段性优势。这是研究煤在地质地球化学演化过程中的化学反应及其与煤成气形成演化关系的一个方面,为干酪根热降解机理和煤成气演化规律的研究提供了新的理论依据。 

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.