准噶尔盆地西北部和什托落盖盆地侏罗系烃源岩芳烃分布特征及地球化学意义  

Geochemical Significance and Distribution Characterisitics of Polycyclic Aromatic Hydrocarbons from the Jurassic Source Rocks in the Heshituoluogai Basin,Northwest Junggar

作　　者：刘洪军[1] 秦黎明[2] 张枝焕[3] 

机构地区：[1]西安石油大学油气资源学院,陕西西安710065 [2]中国石化石油工程技术研究院,北京100101 [3]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249

出　　处：《天然气地球科学》2012年第6期1104-1115,共12页Natural Gas Geoscience

基　　金：国家重点基础研究发展计划("973")课题(编号:2006CB202303);国家科技"十一五"重大专项专题之"中西部重点碎屑岩领域油气富集规律与分布预测"联合资助

摘　　要：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。According to the GC-MS analysis and identification of aromatic hydrocarbon,the distribution of aromatic hydrocarbons is investigated.The results indicate that the distribution of aromatic hydrocarbons is extensive from dinuclear aromatics to heptacyclic aromatics.The relative abundance of tetracyclic and pentacyclic aromatics is apparently higher than that of dinuclear and tricyclic aromatics in Jurassic source rocks.The distribution of PAH in mudstone and coal is easily affected by the sedimentary facies.The relative content of phenanthrene,fluoranthene,pyrene,chrysene,benzofluoranthene and benzo[e]pyrene is higher than other compounds in the mudstone from Badaowan Formation,but in Xishanyao Formation,the content of perylene is predominantly higher.In Sangonghe Formation,the content is high.However,in the coal from Badaowan Formation,the content of them is high,but in the coal from Xishanyao Formation,the content of benzofluoranthene,benzo[e]pyrene and benzo[a]pyrene is high and other compounds is low.Additionally,retene exits in Jurassic rock and its content is moderate.The parameters of alkyl naphthalene and dibenzothiophene reflecting maturity changes greatly,indicating that the indexes of coal is higher than mudstones′,which is positively correlated with the ratios of Pr/Ph and δ13Caro.But the parameters of tetracyclic and pentacyclic aromatics are negatively correlated with them.However,the parameters of alkylated phenanthrene of mudstones change less,which has shown that Rc ratios are close to the measured Ro.Therefore,organic facies affect PAHs′ parameters obviously.The correlatographs of dibenzothiophene/phenanthrene and Pr/Ph or OF/（OF＋F） and SF/（SF＋F） reflect that Jurassic source rock is deposited from weak oxidizing shore-shallow lacustrine to oxidative fluvial facies or delta facies.

关 键 词：多环芳烃 分布特征 地球化学意义 侏罗系低熟烃源岩 和什托落盖盆地 

分 类 号：TE122.113[石油与天然气工程—油气勘探]