关键词: 镜质组反射率, 生油岩, 不同类型, 成熟度指标, 分布规律, 有机质类型, 有机岩, 成熟阶段, 油页岩, 腐殖煤

Abstract: In this paper,the optical properties,origin and distribution pattern of vitrinite occurring in different kinds of organic rocks and oil source rocks are investigated in detail,and a preliminary classification is suggested in which vitrinite are divided into three types according to its origins hydrogenrich vitrinite(A),normal vitrinite(B)and reworked vitrinite(C).A quantitative discussion is made for the reflectance differances between this three types and their evolution pattern during thermal maturation.It is pointed out that the selection of maturation parameter for oil source rocks should depend on their organic petrological characteristics.In low mature stage,the reliability of vitrinite reflectance as a maturation parameter will increase as the organic type of the oil source rock becomes worse.However,in the over mature stage,the reflectances of the three types of vitrnite become gradually consistent,and all of them can be used as a maturation parameter.