The initial organic matter type, mean hydrogen/ carbon ratio of hydrocarbon products, median expulsion efficiency from high mature source rocks and close extent of reaction system mainly affect restoration factor of organic matter abundance. 原始有机质类型、烃产物的H/C值、高成熟烃源岩中间产物是否排出和反应体系的封闭程度是影响有机质丰度恢复系数大小的主要因素。