terpane

Biological marks of the crude oil contain long lateral chain of tricyclic terpane, and the content of gammacerane is low.

油生物标志化合物分布,见长侧链烷,但γ-蜡烷丰度较。

The crude oils of Chang 20 belong to typical immature oil which have odd even predominance and lower ratios of sterane and terpane maturity index.

长20井的油既具有正烷烃奇优势，又具有较甾烷异构体比值，属于典型的油。