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干酪根和煤红外光谱中的芳碳含量常以1600cm~(-1)频带来表征.但该频带的强度受芳碳骨架化学环境和结构的强烈影响.用苯并菲、茬、二羟基蓁、二苯酮和联苄等6种模型化合物进行红外光谱分析发现,1600 cm~(-1)频带因芳环稠化而迅速减弱,因邻接含氧基团而显著增强.对不同类型干酪根的热模拟系列产物进行了红外光谱和固体~(13)C核磁共振波谱的综合研究.结果表明,1600 cm~(-1)的摩尔吸光系数ε_1600有随演化加深而下降的趋势,尤以煤系干酪根为甚,与模型化合物的结果相符.因此,吸收系数K_1600可用以区分干酪根的类型,但不宜用作其成熟度的参数.
The aromatic carbon content in kerogen and coal infrared spectra is often characterized by a frequency of 1600 cm -1 but the intensity of the band is strongly influenced by the chemical framework and structure of the aromatic carbon skeleton. , Benzophenone and bibenzyl and other 6 kinds of model compounds by infrared spectroscopy analysis found that 1600 cm -1 frequency band due to aromatic ring thickening and rapidly decreased due to adjacent oxygen groups and significantly enhanced for different types of kerogen The results show that the molar extinction coefficient ε 1600 of 1600 cm -1 tends to decline with the deepening of evolution, especially in coal The kerogen is even higher, which is consistent with the results of the model compounds. Therefore, the K_ 1600 can be used to distinguish the kerogen type but not as a parameter of its maturity.