Abstract: Based on the study of the chromatogram of terpane m/e 191 fragment,the 5 types of crude oil from the Beijing and Tianjin region are divided into two groups:one with abundant terpane and the other with only a small amount of terpane.It is believed that the oil in the third member of Shahejie Formation(Es₃)comes primarily from the Es₃ source rock,and the crude oil in the fourth member of Shahejie(Es₄)-Kongdian Formation and the buried hill comes from Es₄-Kongdian source rock.By using the parameters of sterane isomers,4 sources are determined for the crude oil of the region,among whicn 4 are of a single origin and 1 of mixed origin.

摘要： 运用萜烷 m/e191特征碎片图,将京津地区五对原油,生油岩分为两组,一组是沙三段,含有丰富的萜烷;另一组是沙四段以下,萜烷含量甚微.据此可判断:沙三段的原油主要来自沙三段母岩,而沙四段孔店组和潜山原油则来自沙四段～孔店组母岩.运用甾烷异构物参数,确定了五个油层的油源,其中四个是单一油源,一个是混合油源.