In accordance with the chronological characteristics of biomarkers of crude oil,the authors propose that the Jurassic crude oil and Upper Permian crude oil can be identified by Diterpene index.

• 根据原油中生物标记物的年代学特征 ；提出利用二萜烷指数将侏罗系的原油 (二萜烷指数 >0 8)与上二叠统的原油 (二萜烷指数 <0 5 )加以区别的方法。