Article

Petroleum Geology & Experiment

, 37:14

First online:

Open Access This content is freely available online to anyone, anywhere at any time.

Differences of nitrogen isotopes in crude oils from different depositional environments

  • Yazhao LiuAffiliated withWuxi Research Institute of Petroleum Geology, SINOPECState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing)
  • , Minghui WuAffiliated withSINOPEC Petroleum Exploration and Production Research Institute
  • , Shengbao ShiAffiliated withState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing)
  • , Jie WangAffiliated withWuxi Research Institute of Petroleum Geology, SINOPEC
  • , Wei LiAffiliated withState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing)

Abstract

As an important element of oil and organic matter, the contents and isotopes of nitrogen are different due to different sources from different environments and different late diagenetic processes after burial. The contents and isotopes of nitrogen in urea and caffeine show that these nitrogen parameters of samples are highly variable and indicate different depositional environments. The carbon and especially the nitrogen isotopes of crude oils formed in marine environments are lighter than those in continental environments, For samples from the same environment, high-temperature cracking causes nitrogen isotope fractionation. 14N is enriched in crude oils and nitrogen isotopes are lighter in high-maturity oils

Key words:

nitrogen content; nitrogen isotope; carbon isotope; different depositional environment; maturity; crude oils;

不同沉积环境中原油氮同位素差异特征研究