当前位置: X-MOL 学术Org. Geochem. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Fluorescence lifetime evolution of crude oils during thermal cracking: Implications from pyrolysis experiments in a closed system
Organic Geochemistry ( IF 3 ) Pub Date : 2021-07-08 , DOI: 10.1016/j.orggeochem.2021.104273
Peng Cheng 1, 2 , Botong Liu 1, 3 , Hui Tian 1, 2 , Xianming Xiao 4 , Haifeng Gai 1, 2 , Qin Zhou 1, 2 , Tengfei Li 1, 2 , Dehan Liu 1, 2
Affiliation  

In this study, pyrolysis experiments were performed on two crude oils with different origins in a closed system, and the pyrolyzed oils were then analyzed for spectral parameters, including fluorescence lifetime, fluorescence spectra and infrared spectra, as well as for gross chemical compositions. The results show that the evolution of the fluorescence lifetime of crude oil (τoil) can be divided approximately into two stages during oil cracking. With the increasing extent of oil cracking (PC), the τoil first increases at the early cracking stage of PC < 40%, and then it decreases at the late cracking stage of PC > 40%. The type and concentration of aromatics in crude oils, which can be respectively characterized by the fluorescence lifetime of aromatics (τaro) and the saturates/aromatics ratio (Rsat/aro) of the oils, largely control the fluorescence quantum yield and fluorescence quenching degree of the oils, respectively, and thus the changes in the two factors during oil cracking determine the fluorescence lifetime evolution of crude oils. The differences in fluorescence lifetime of the crude oils that are sourced from diverse types of organic matter cannot be masked by the oil cracking process when the PC is smaller than 80%. Combined with fluorescence or infrared spectral data, the fluorescence lifetime potentially can be applied to discriminate oils of various origins in petroleum reservoirs, especially in deep, light oil/condensate reservoirs where biomarker concentration is extremely low.



中文翻译:

原油在热裂解过程中的荧光寿命演变:封闭系统中热解实验的启示

在这项研究中,在封闭系统中对两种不同来源的原油进行了热解实验,然后分析了热解油的光谱参数,包括荧光寿命、荧光光谱和红外光谱,以及总化学成分。结果表明,原油(τ oil)荧光寿命的演变在石油裂解过程中大致可分为两个阶段。随着石油裂化(P增加幅度Ç)时,τ在P的早期裂解阶段先增加ç  <40%,然后将其在P的后期裂解阶段减小Ç > 40%。原油中芳烃的类型和浓度,可以分别用芳烃的荧光寿命(τ aro)和油的饱和/芳烃比(R sat/aro)来表征,在很大程度上控制着荧光量子产率和荧光猝灭原油裂解过程中两个因素的变化决定了原油的荧光寿命演变。来自不同类型有机物的原油荧光寿命的差异无法被石油裂解过程掩盖,当 P C 小于 80%。结合荧光或红外光谱数据,荧光寿命可能用于区分油藏中各种来源的油,特别是在生物标志物浓度极低的深层轻油/凝析油藏中。

更新日期:2021-07-28
down
wechat
bug