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为研究未熟油与成熟油混合后生物标志化合物参数变化,选择苏北盆地的两个成熟度相差悬殊的油样按不同比例混合,并将混合油样进行族组分分离,对饱和烃进行了气相色谱和色谱-质谱分析。结果表明,混合样的指标与混合比例呈不同的变化规律,正烷烃和萜烷等参数与混合比大致呈线性变化,而甾烷等参数与混合比呈非线性变化。造成这一差别的原因主要是混合双方中的甾烷、萜烷、正烷烃等化合物质量分数存在的差异。通过计算证实,混合双方的化合物质量分数相差较大时,混合样中有关参数与混合比呈“非线性”变化并总是倾向于质量分数大的一方,直到低质量分数一方混入比占绝对优势时才消失,此现象被称为流体混合中的“浓度-特征贡献比”分配原理。由此说明,混合比例的确定不能仅以指标为依据,而首先要弄清有关化合物的原始质量分数,那些仅根据甾烷成熟参数认定的“未熟油”,实际可能是以成熟油为主的混合油。
In order to study the parameter changes of biomarkers after the mixture of unripe oil and mature oil, two oil samples with different maturity in the Northern Jiangsu Basin were selected and mixed in different proportions. The mixed oil samples were separated by family components and saturated hydrocarbons Gas Chromatography and Chromatography - Mass Spectrometry. The results showed that the mixing index and mixing ratio showed different changing rules. The parameters such as n-alkanes and terpanes changed roughly linearly with the mixing ratio, while the parameters such as sterane showed a nonlinear change with the mixing ratio. The main reason for this difference is the difference in the mass fraction of the compounds such as sterane, terpane and n-alkane in the mixture. It is confirmed by calculation that when the mass fractions of the two compounds are greatly different, the relevant parameters in the mixed sample change “non-linearly” with the mixing ratio and tend to be the ones with the larger mass fraction until the lower mass fraction is mixed Disappears. This phenomenon is called the “concentration-feature contribution ratio” distribution principle in fluid mixing. This shows that the mixing ratio can not be determined only based on indicators, but first of all to understand the original mass fraction of the compounds, those based only on steranes maturity parameters identified as “immature oil” may actually be mainly based on mature oil Mixed oil.