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苏北盆地不同成熟度原油混合的现象比较普遍。选择Ｓ７ 井典型成熟油与Ｔ６ 井典型未熟油，将它们按质量百分比混合进行混源实验，以验证混源对族组分、饱和烃、生物标志化合物等地球化学参数的影响。实验研究结果表明，目前勘探发现的“未熟油”， 其正构烷烃的主要来源仍是干酪根生成的成熟油。计算了成熟度参数Ｃ２９２０Ｓ／（２０Ｓ＋ ２０Ｒ） 、∑ｎＣ１５ ＋ ／∑ααα甾烷Ｃ２７ ～２９２０Ｒ及饱和烃含量之间的关系，并分析了实验数据与理论计算结果的差异。根据油气初次运移及二次运移对地球化学参数影响较小的特点，用排烃条件较差的油源岩自然演化的样品数据代表原始的不同成熟度原油，进行某一特定未熟油与不同成熟度原油的理论混源计算，绘制出理论图版。应用该图版，可计算各油田未熟油与成熟油的比例，还可分析成熟油的最大成熟度、油藏成藏时间、生物降解及油气运移等情况。
The mixing of crude oils of different maturity in the Northern Jiangsu Basin is quite common. The typical mature oil from well S7 and the typical undercured oil from well T6 were selected and mixed by mass percent to conduct mixed-source experiments to verify the influence of mixed sources on geochemical parameters such as family components, saturated hydrocarbons and biomarkers. Experimental results show that the main source of n-alkanes found in the “immature oil” currently discovered by exploration is still the mature oil generated by kerogen. The relationship between maturity parameter C2920S / (20S + 20R), ΣnC15 + / Σααα-sterane C27 ~ 2920R and saturated hydrocarbon content was calculated and the difference between experimental data and theoretical calculation was analyzed. According to the characteristics that the primary migration and secondary migration of oil and gas have little effect on geochemical parameters, the data of natural evolution of oil source rocks with poor hydrocarbon expulsion conditions represent the crude oil of different maturity, Different maturity of the theory of mixed crude oil source calculations, draw a theoretical version. Using this plate, the ratio of immature oil to mature oil in each field can be calculated, and the maximum maturity of mature oil, reservoir forming time, biodegradation, and hydrocarbon migration can be analyzed.