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渤海油田绝大部分稠油遭受了严重生物降解,给油源对比带来困难。研究表明,在渤海油田严重生物降解原油中普遍检测到的25-降藿烷系列化合物是由藿烷的微生物脱甲基作用而生成,基于此生成机理及化学加和性原理,提出了生物标志物定量叠加参数恢复法,即将生物降解原油中残余的正常藿烷的质量以及与其对应的25-降藿烷的质量及所脱去甲基的质量求和,从而得到原始原油中正常藿烷的质量参数。利用本文方法对渤海油田不同地区、不同层位、不同降解等级的稠油样品藿烷系列参数进行恢复,进而校正伽马蜡烷指数,并与长链三环萜烷(ETR)指数共同组成区分东营组、沙一段、沙三段原油的有效油源对比指标,最终完成了研究区生物降解原油油源对比,其结果也验证了本文方法在严重生物降解原油的油-油对比和油-源对比研究中的有效性。
The vast majority of heavy oil in Bohai Oilfield suffered severe biodegradation, which made it difficult to compare oil sources. The results show that the 25-norhopanes series compounds commonly detected in the severely biodegradable crude oil in Bohai oil field are generated by the demethylation of hopanes microorganisms. Based on this formation mechanism and the chemical additive principle, biomarkers Quantitative superposition of parameters recovery method, the biodegradable crude oil that is about the quality of the remaining normal hopane and its corresponding 25-norhopane quality and the quality of the de-summed methyl, resulting in the original crude oil hopane Quality parameters. By using this method, the parameters of the hopane series in heavy oil samples of different regions, different horizon and different degradation grades in the Bohai Oilfield are recovered, and then the gamma-paraffin index is corrected, which is divided by the long-chain tricyclic terpane (ETR) index Dongying Formation, Sha-1, Sha 3 sections of the effective source of crude oil comparison index, the final completion of the study area biodegradable crude oil source comparison, the results also validate the method of this paper in the severe biodegradation of oil-oil contrast and oil - source Comparison of the effectiveness of the study.