准噶尔盆地北三台地区湖相原油咔唑类化合物的地球化学特征

Geochemical Characteristics of Carbazole Compounds in Lacustrine Oils from Beisantai Area, Junggar Basin

准噶尔盆地北三台地区北 82井、北 83井和沙 10 8井湖相原油咔唑类化合物的分布特征表明 ,油气运移作用是影响该区原油中咔唑类化合物分布的重要因素。沿油气运移方面 ,咔唑类化合物具有明显的分馏效应。总的趋势是原油中咔唑类化合物、高分子量的烷基咔唑化合物和苯并咔唑化合物的含量逐渐减少 ,低分子量咔唑和甲基咔唑 ,以及具屏蔽效应的二甲基咔唑和苯并 [a]咔唑异构体的相对含量则逐渐增加。利用咔唑类化合物的分馏效应 ,可有效地指示油气运移方向。

Rich carbazole compounds, including carbazole, alkylcarbazoles, benzocarbazoles and alkylbenzocarbazoles, were detected by GC/MS in lacustrine oils from Beisantai area, Junggar Basin. Changes in contents of carbazoles and its isomers indicate that there exists an obvious migration fractionation. From Fukang depression to Beisanta uplift, the concentrations of carbazole compounds and its benzocarbazoles have decreased during oil migration, but the relative contents of carbazole, methylcarbazoles and isomers with shield effects have increased. The results indicate that the distributions of carbazole compounds in oils of the same origin are mainly controllted by the oil migration, and they have potential significance in reseaching oil migration.