降解混合型稠油物化性质研究——以辽河盆地西部凹陷为例

Physics-chemical Property Research of Mixed-heavy Oil with Biodegradation

利用生物标志物等资料分析降解混合型稠油的地球化学特征及识别标志 ,研究表明混合型稠油是早期聚集并遭受强烈生物降解的原油与晚期注入的未遭受生物降解的原油的混合物。其地球化学指标具有不协调的特征 ,原油的组成和性质亦出现与生物降解相反的变化趋势 ,降解后混合导致稠油“稀化” ,从而改善稠油的物理化学性质。各油层降解混合型稠油呈非均衡性 ,距生油洼陷越近 。

Based on the research of biomarker,geochemical characters of mixed-heavy oilhave been studied.It indicates that mixed-heavy oil the mixture which is undergone biodegradation earlier an injected non-biodegradation later.The geochemical parameters are not coordination and composition and property have opposite tendency to biodegradation.After biodegradation,the mix may lead to heavy iol dilution and improve its pysics-chemical property.Mixed-heavy oils in different oil reservoirs are non-equilibrinm.It shows that the nearer oil generating depression is,the more dilution heavy-oil is.