原油中吡咯类含氮化合物的分布型式

不同类型原油的实验结果表明:原油中存在咔唑、苯并咔唑及二苯并咔唑3类吡咯类化合物,且以前两类为主。两大系列同系物的相对丰度呈正态分布。咔唑、苯并咔唑的分布型式除与原油母质类型有关外,还受油气运移及热成熟作用的影响。高等植物输入较多的原油相对富集烷基苯并咔唑和二苯并咔唑;油气运移距离增加,咔唑系列相对富集;成熟度增加,低分子量化合物富集。由于原油中吡咯类化合物的取代位优先且局限于某些特定的部位,所以其分布型式存在多种同分异构体。不同的同分异构体可能与干酪根先质的结构有关。

DISTRIBUTION PATTERN OF PYRROLIC NITROGEN COMPOUND IN CRUDE OILS

Test results of different types of crude oils show that pyrrolic compounds such as carbazole,benzocarbazole and dibenzocarbazole are found,and the first two types are predominent.The relative abundance of the homologues of these two types show normal distribution,which is closeby related to source material types and the effect of oil and gas migration and thermal maturation.The crude oil that was mainly derived from high plant contains relatively more alkylbenzocarbazole and dibenzocarbazole;the increase of oil and gas migration distance could result in the enrichment of carbazole series;the increase of maturity could increase the enrichment of low molecular weight compounds.The pyrrolic compounds have various isomers,this might be related to different mother materials of kerogen.