Seventeen crude oil samples including five Bohai oils from different offshore oil platforms, five Weizhou island oils from different offshore oil platforms and seven external oils were identified on the basis of eight charac-teristic ratios of diamondoid compounds using principle component analysis (PCA). The results showed that all the Bohai oil samples from different offshore oil platforms were placed in Group I, Weizhou island oils from different offshore oil platforms were classified into other groups and seven external oils from different areas were signifi-cantly difference. Characteristic ratios based on diamondoid compounds coupled with principle component analysis could be used to identify large numbers of crude oil, but to the crude oil samples with little difference, the two analysis methods had some constraint.% 基于原油中金刚烷生物标志物的特征诊断比值,采用主成分分析,对17个不同来源的原油样品进行主成分分析,结果显示：涠洲岛海上不同采油平台原油样为一大类,渤海海上不同采油平台的原油为第二类,7个国外进口原油由于油样来源地区差异比较大。基于原油中金刚烷特征诊断比值的主成分分析可以实现差异较大原油大量样品的快速分离,但对差异较小的油样分辨力仍存在一定局限。
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