夏季室外自然风化条件下燃料油中金刚烷的组分变化特征

以燃料油为研究对象进行室外自然风化实验（0~100d），探讨了金刚烷的风化规律，在同一风化条件下，比较了燃料油和原油中金刚烷组分的风化特征。结果表明:燃料油中单金刚烷在风化60d内全部被降解，渤海原油1号中单金刚烷在风化45d内被降解完全，双金刚烷受风化影响较小。通过t检验分析，所选诊断比值中，燃料油中有7个金刚烷指标在风化20d内保持稳定，双金刚烷指标DMDI-3、DMDI-4和DMDI-5在自然风化100d内具有较好的稳定性，适合于长时间风化条件下溢油的鉴别。与渤海原油1号相比，燃料油中双金刚烷诊断比值稳定性更好，这可能与燃料油中双金刚烷浓度高、数据信号强、计算过程引入的误差小有关。

Variation of diamondoid compounds in the fuel oil during long-term natural weathering

The changes of diamondoid compounds in the fuel oil sample during natural long-term weathering (0~100 days) were presented.Adamantanes in fuel oil were not found after 60 day natural weathering,adamantanes in crude oil from Bohai sea No.1 were not found after 45 day natural weathering.The concentrations of diamantanes slightly decrease with an increase of weathering time and diamantanes have stronger weathering-resistant capabilities.According to the "Student's t" test,seven ratios of diamantanes had no apparent changes which could indicate the source of the samples during 20 days weathering.Diamantanes ratios of DMDI-3,DMDI-4 and DMDI-5 are essentially unaltered after 100 days natural weathering which could indicate the source of the samples during natural long-term weathering.The diagnostic ratios of diamantanes in fuel oil are relatively more stable compare with those in crude oil.