本文试图利用煤和分散有机质芳烃红外光谱图上1600cm~(-1)的吸收光密度与1460cm~(-1)的吸收光密度之比(Y值),讨论有机质的演化程度。利用羰基的吸收特性讨论有机质的母质类型。选定C值(1740cm~(-1)与1700cm~(-1)光密度之比)作为母质类型指标的判别值,并讨论了它的变化范围。利用氯仿沥青及族组份分析的操作手续,把煤和分散有机质的芳烃分离出来,将芳烃用氯仿溶解后涂于溴化钾晶片上,在PE—720型红外分光光度计上扫描得到红外光谱 In this paper, we try to discuss the evolution of organic matter by using the ratio of absorbed optical density (1600cm -1) to absorbed optical density (1460cm -1) on the infrared spectrum of coal and dispersed organic aromatic hydrocarbons. Discussion on the Substance Types of Organic Matter by Using the Absorption Properties of Carbonyl. The selected C value (the ratio of optical density of 1740cm -1 to 1700cm -1) was taken as the discriminant value of parent type index and its variation range was discussed. Using chloroform bitumen and family component analysis procedures, the coal and organic matter-dispersed aromatics are separated, the aromatics are dissolved in chloroform and applied to a potassium bromide wafer, and the infrared spectrum is scanned on a PE-720 infrared spectrophotometer