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采用对未熟有机质富集培养本源菌再进行类发酵(Eh>-300mV)的模拟实验方法,重点研究了发酵样品中某些生物标志化合物的变化,探讨了在低演化阶段,由于细菌对有机质的参与和改造,液态烃类形成的地球化学特征。样品发酵后,烃类,尤其是低相对分子质量烃类含量增加,CPI和OEP值接近或略高于1。族组成中,沥青质含量减少,烃类和非烃增加。饱和烃中,C-13位上带有正烷基侧链的三环萜烷出现;高含量的伽马蜡烷被检出;生物构型藿类化合物向地质构型藿烷转化,C-22位上立体异构化平衡参数明显增大,接近或达到异构化终点值;单芳甾类烃与三芳甾类烃共存;甾体化合物含量的总体趋势是相对贫乏,平衡参数较低。
In order to study the changes of some biomarkers in fermented samples, we studied the changes of some biomarkers in fermented samples by simulating the fermentations (Eh> -300mV) Participate in and reform, the geochemical characteristics of the formation of liquid hydrocarbons. After the sample was fermented, the content of hydrocarbons, especially the low relative molecular mass hydrocarbons, increased and CPI and OEP values were close to or slightly higher than 1. In the family composition, the asphaltene content is reduced, while hydrocarbons and non-hydrocarbons are increased. In saturated hydrocarbons, tricyclic terpanes with n-alkyl side chains at C-13 appear; high-content gamma-alkanes are detected; bio-configuration of ganache compounds transforms into geostructure hopanes; C- The stereoisomerisation equilibrium parameter at position 22 increased significantly, approaching or reaching the end of isomerization. The mono-steroids and tri-steroids coexisted. The overall trend of steroid content was relatively poor with lower equilibrium parameters.