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盐城凹陷朱家墩气藏盐参1井阜一段储层所产凝析油与该井上白垩统泰州组成熟烃源岩在各类生物标志化合物的分布与组成特征上具有较好的相似性,表明它们在成因上存在相关性,但生物标志化合物成熟度参数显示凝析油的成熟度明显高于所研究的烃源岩。烷基单金刚烷类是原油和烃源岩中一类具有高热稳定性的烃类化合物,其中双金刚烷系列的热稳定性高于单金刚烷系列。分析结果表明:凝析油中不但存在烷基单金刚烷系列,同时也存在烷基双金刚烷系列,但在上白垩统泰州组烃源岩中仅检测到烷基单金刚烷系列,烷基双金刚烷系列不但不完整且丰度很低,这一现象表明原油的成熟度明显高于所研究烃源岩,这与生物标志化合物成熟度参数的结果相吻合。依据甲基单金刚烷指数MAI和甲基双金刚烷指数MDI与镜质体反射率间的对应关系,发现该凝析油对应的镜质体反射率RO值介于1.3%~1.6%之间,由此说明它源于盐城凹陷内处于凝析油气阶段的泰州组烃源岩。由此可见,金刚烷类化合物在确定原油和烃源岩中有机质成熟度上具有特殊意义。
The condensate oil produced in the first member of the Yichang-1 well in the Zhujiadun gas reservoir of Yancheng sag and the mature source rock of the Taizhou formation in the upper Cretaceous have similarities in the distribution and composition characteristics of various biomarker compounds, Indicating that they are genetically related, but the biomarker maturity parameters show that the maturity of condensate is significantly higher than that of the source rocks studied. Alkyl monoadamantanes are a class of hydrocarbon compounds with high thermal stability in crude oil and source rocks. The double-adamantane series have higher thermal stability than monoadamantane series. The results show that not only the alkyl monoadamantane series but also the alkyl double adamantane series are present in the condensate. However, only the alkyl monoadamantane series and the alkyl monoadamantane series have been detected in the source rocks of the Upper Cretaceous Taizhou Formation The double-adamantane series is not only incomplete but also low in abundance. This phenomenon indicates that the maturity of crude oils is significantly higher than that of the source rocks under study, which agrees with the results of the biomarker maturity parameters. According to the correspondence between methyl monoadamantane index MAI and methyl diamantamantane index MDI and vitrinite reflectance, it was found that the corresponding vitrinite reflectance RO value of the condensate ranged from 1.3% to 1.6% , Indicating that it originated from the Taizhou Formation source rock in the condensate phase in Yancheng sag. Thus, adamantanes have special significance in determining the maturity of organic matter in crude oil and source rocks.