The Change of Crude Oil Components in Different Production Stages
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摘要: 运用有机地球化学分离、分析技术对取自塔里木盆地的东河、塔中和轮南油田不同时期开采出的原油样品进行剖析,研究其宏观组成和微观分子在时空上的变化规律。分析结果表明,原油饱 /芳比值随开采时间的推移呈下降的趋势;饱和烃与非烃 +沥青质的含量变化有很好的相关性。随着开采时间的增长,原油中正构烷烃的主峰碳数后移,原油的轻 /重组分比降低。原油碱性氮、有机酸等非烃类化合物随开采时间的推移也呈降低的趋势。这些变化与原油在驱替过程中的自然色层吸附作用机理和原油中各种组分的相互作用关系有关。该项研究对于深入探索驱油机理、预测原油润湿性和提高采收率具有重要的实际意义。Abstract: Crude oils in different production stages are analyzed by organic geochemical technology. The oils from Donghe,Tazhong and Lunnan oil field in Tarim basin are collected from different stages in the process of production. In addition, the variation rule of crude oil components is studied and the internal relations between crude oil components and production stages are also investigated. The experiment results indicate that the saturate/aromatics ratio show decreasing trend with production; There is a direct relationship between saturate and NSO + asphaltene with production. The carbon number range or the peak carbon number of normal alkanes in crude oils shift backuard and the light/heavy hydrocarbons ratio show decreasing trendtion.During oil recovery,polar components including various heteroatom-bearing functional groups with basic or acidic property tend to reduce in crude oil Therefore, this investigation has practice significance in researching expelled mechanics from microcosmic points of view, evaluating wetting alteration in crude oils and increasing production ratio of crude oils.
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Key words:
- oil recovery /
- crude oil composition /
- organic nitrogen NSO /
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