n.萜烷

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. 从长20井低熟原油中检测到了一定量的28，30二降藿烷，这说明源岩形成于极度厌氧的环境。

The biomarker of steran,terpane,aromatic and adamantanewere detected by thls method from any kind of natural gas, and the gas-biomarkerapplication was approached. 从各类天然气中检测出甾萜烷、芳烃和金刚烷等一系列生物标志化合物，并进行了天然气生标的应用研究探索。

The composition of regular sterane suggests the different times, while distribution pattern of tricyclic terpane and abundance of diahopanes indicate the discrepancies of sedimentary environments. 据此，初步将这些参数应用于两方面研究，一是为划分地层沉积环境提供“生物标志物相标志”，二是研究油源对比，取得良好效果。

Through comparing experiments, it was found that this method has special dominance in checking trace biomarkers and in determining nature and fixing quantity of a complex sterane and terpane. 色谱-质谱-质谱由于是两级质谱串联比色谱-质谱增加了选择性,有了更强的分离能力,提高了对复杂混合物如甾、萜类化合物定性和定量的可靠性。

Keywords Kashan Block;terpane;sterane;isoprenoidies;oil-gas migration; 卡山区块;萜烷;甾烷;类异戊二烯;油气运移;