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对中国南海原油样品的分析发现 ,双环倍半萜异常丰富。双环倍半萜分布特征显示 ,A区原油重排补身烷含量相对较高 ,C区原油补身烷含量相对较高 ,这一特征与塔里木盆地海相和湖相原油特征相一致 ,暗示南海A、C区原油可能属不同成因类型 ;这一特征与其原油分子组成的非均质性在油区内的变化颇具一致性。此外 ,绝对定量分析发现 ,多数原油样品双环倍半萜的含量基本上恒定于 10 0 0～ 2 0 0 0 μg/g之内 ;但藿烷含量的变化幅度十分明显 ,变化范围为 179～ 4130 μg/g ,这可能预示双环倍半萜可能存在与藿烷不同的生物先质
An analysis of crude oil samples from the South China Sea found that bicyclic sesquiterpenes are exceptionally abundant. The characteristics of the bicyclic sesquiterpenes showed that the content of complement oil in rearrangement of A crude oil was relatively high and that of C crude oil was relatively high, which was consistent with the features of marine and lacustrine oils in Tarim Basin, suggesting that the South China Sea A, C area of the crude oil may belong to different genetic types; This feature is consistent with the changes in the composition of the crude oil molecular heterogeneity within the oil zone. In addition, the absolute quantitative analysis found that the majority of crude oil samples bicyclic sesquiterpenoid content is basically constant within 100 ~ 20000μg / g; but hopane content of the range of change is obvious, ranging from 179 to 4130 μg / g, which may indicate that biocyclic sesquiterpenoids may have different biological precursors than hopane