干酪根的碳同位素组成与源岩类型有无相关性存在不同认识,此次研究表明,在陆相沉积条件下,腐泥型干酪根相对富集轻碳同位素~(12)C(δ~(13)C一般小于-28‰),腐殖型干酪根相对富集重碳同位素~(13)C(δ~(13)C一般大于-26‰)。热模拟实验表明,热演化过程对干酪根碳同位素不产生明显影响,但其H/C原子比随热演化程度增高而减小。已有资料对干酪根氢同位素研究较少,本文研究表明,干酪根的氢同位素组成主要与沉积介质的盐度有关。笔作者将干酪根氢同位素组成δD=-130‰作为源岩沉积介质为淡水和咸水一半咸水的界限,前者小于-130‰,后者大小-130‰。 There is a different understanding of the correlation between the carbon isotopic composition of kerogen and the type of source rocks. This study shows that the kerogen is relatively enriched in light carbon isotopes (δ ~ (δ ~ 13) C is generally less than -28 ‰), relative enrichment of humic kerogen ~ (13) C (δ ~ (13) C is generally greater than -26 ‰). Thermal simulation results show that the thermal evolution does not have a significant effect on the kerogen carbon isotope, but the H / C atomic ratio decreases with the increase of thermal evolution. The available data on kerogen hydrogen isotopes less research shows that the kerogen hydrogen isotope composition and deposition medium mainly related to the salinity. The author of the kerogen hydrogen isotope δD = -130 ‰ as the source rock deposition medium for freshwater and salt water half of the limit of salt water, the former is less than -130 ‰, the latter size -130 ‰.