混合作用对原油芳烃化合物地球化学参数的影响研究

以冀中坳陷苏桥-文安地区原油为例,系统地研究了端元油和混合油中芳烃化合物含量的变化趋势,探讨混源作用对原油芳烃参数的影响。结果表明:苏桥-文安地区原油主要形成于弱氧化的淡水湖相沉积,有机质输入以高等植物为主,低等水生生物也有一定贡献,为成熟原油;不同油源原油的混合使得原油芳烃馏分中各化合物的绝对浓度呈线性减少或增加的趋势,而相对含量和分布特征则会发生各种不同的复杂变化,导致许多芳烃地球化学参数变化紊乱;混合油样中的芳烃指标数值不仅取决于混合油的混合比,而且受有关化合物的原始质量分数的影响。

Effect of Mixture on Geochemical Parameters of Aromatic Hydrocarbon in Crude Oil

By taking crude oil from Suqiao-Wen′an Area in Jizhong Depression as an example,the content variation tendency of aromatic hydrocarbon in response to mixture of different oils was studied systematically,the effect of mixed oil on aromatic hydrocarbon parameters was discussed.The results indicate that the crude oils in Suqiao-Wen′an Area are sourced from the organic matter deposited in fresh water and weak oxidizing lacustrine sedimentary,and the organic matter of source rocks are mainly matured oils from higher plants,partly from lower aquatic living things.The mixing of oils from different source rocks would result in the absolute concentration of their aromatic hydrocarbons decrease or increase linearly,while their relative content and distribution characteristics present different changes and the geochemical parameter changes were disordered.The value of aromatic hydrocarbon parameters of the mixed oils not only depends on the mixture proportions,but also the influence of original quality of compounds concerned.