原油中吡咯类含氮化合物运移参数的适用性

原油中吡咯类含氮化合物参数已经成为研究油气运移方向的主要指标，但在不同的地质条件下并非总是适用。根据胡状集油田部分原油色谱质谱测试数据，分析了沉积环境、原油成熟度、生物降解作用等因素对吡咯类化合物分布的影响，讨论了部分吡咯类化合物运移参数的适用性。分析结果表明：原油成熟度对吡咯类化合物分布有明显的控制作用，沉积环境对其也有一定的影响，而生物降解作用对其影响很小；运移参数中吡咯类化合物质量比、烷基咔唑/苯并咔唑及苯并咔唑比值与成熟度呈明显正相关的关系，而与伽马蜡烷指数呈明显负相关的关系，因而这些参数已不适合用来指示油气运移方向，而二甲基咔唑同分异构体比值受成熟度及沉积环境影响很小，仍可作为油气运移的有效参数。

APPLICABILITY OF PYRROLIC NITROGEN COMPOUND MIGRATION PARAMETER IN CRUDE OIL

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.