Abstract: Pyrrolic nitrogen compound parameters are important indicators to study petroleum migration,but they are always not effective in different geological conditions.Based on the test data of the crude oil in Huzhuangji oilfield with gas chromatographmass spectrometry technology,the influence of sedimentary environment，maturity and biodegradation on pyrrolic nitrogen compounds distribution is analyzed,and applicability of pyrrolic nitrogen compound parameters on petroleum migration is discussed.The results show that maturity plays a significant role on pyrrolic nitrogen compounds distribution,while biodegradation plays little role on the pyrrolic nitrogen compounds distribution.The concentration of pyrrolic nitrogen compounds,the ratio of Alkylcarbazole/Benzocarbazole and the Benzocarbazole ratio show an apparently positive correlation with maturity and a negative correlation with Gammacerane index,so they are not suitable to be the indicators of the petroleum migration.Maturity and sedimentary environment have little influence on the isomer ratio of Dimethycarbazole，so it is still a good petroleum migration indicator.

Key words: pyrrolic nitrogen compounds, sedimentary environment, maturity, biodegradation, petroleum migration