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研究了准噶尔盆地西北部和什托落盖盆地侏罗系煤系烃源岩多环芳烃的分布规律。结果表明,该区侏罗系烃源岩中多环芳烃分布广泛,两环芳烃至六环芳烃以及七环芳烃均有分布,单体芳烃主要以四环芳烃和五环芳烃的含量较高,其次为两环芳烃和三环芳烃。研究还表明煤和泥岩的多环芳烃分布极易受沉积相差异发生明显变化,比如侏罗系八道湾组泥岩菲、荧蒽、芘、艹屈、苯并荧蒽与苯并[e]芘的丰度均较高,西山窑组泥岩苝的丰度明显偏高于其余化合物;而八道湾组煤中蒽、芘、苯并[a]芴以及苯并荧蒽丰度较高,西山窑组煤中苯并荧蒽、苯并[e]芘和苯并[a]芴的丰度偏高。另外煤的萘与二苯并噻吩成熟度参数值明显高于泥岩,并且与Pr/Ph值和δ13Caro值呈正相关,与四环芳烃和五环芳烃参数值呈负相关,进一步研究表明多环芳烃比值极易受到有机相类型差异分布影响,仅菲的参数值差异小,泥岩RC值与实测RO值相近,二苯并噻吩/菲值与Pr/Ph值关系和OF/(OF+F)值与SF/(SF+F)值关系反映了侏罗系浅湖相至河流相或三角洲相为开阔水体的弱氧化—强氧化沉积环境。
The distribution of polycyclic aromatic hydrocarbons (PAHs) in the Jurassic coal measure source rocks in the northwestern part of the Junggar Basin and in the Shittoogaigai Basin was studied. The results show that the PAHs in the Jurassic source rocks of this area are widely distributed, with the distribution of the two-ring aromatics to the hexacyclic aromatics and the hepta-aromatics are all distributed. The content of the aromatics mainly includes tetracyclophane and pentacyclic aromatics, Followed by two ring aromatic hydrocarbons and tricyclic aromatic hydrocarbons. The study also shows that PAHs in coal and mudstone are highly susceptible to changes in sedimentary facies, such as mudstone phenanthrene, fluoranthene, pyrene, polydatin, benzofluoranthene and benzo [e] pyrene in the Badaowan Formation of the Jurassic , The abundance of perylene in the mudstone of Xishanyao Formation is obviously higher than that of other compounds, and the abundance of anthracene, pyrene, benzo [a] fluorene and benzofluoranthene in the coal of the Badaowan Formation is relatively high. The abundance of benzofluoranthene, benzo [e] pyrene and benzo [a] fluorene in the coals was high. In addition, the parameters of maturity of naphthalene and dibenzothiophene are obviously higher than that of mudstone, and they are positively correlated with Pr / Ph value and δ13Caro value, negatively correlated with the parameters of tetracyclophane and pentacyclic aromatics. Further studies show that the polycyclic aromatic hydrocarbons The ratios of the values of mudstone to the measured RO are similar, and the relationship between dibenzothiophene / phenanthrene and Pr / Ph and the OF / (OF + F) values are easily affected by the type distribution of the organic phase. The SF / (SF + F) values reflect the weak oxidation-strong oxidative depositional environment of the Jurassic shallow lacustrine-fluvial facies or deltaic facies as open water bodies.