【摘要】 为研究民和盆地中侏罗统优质油页岩的地球化学特征与沉积环境,应用有机碳和GC-MS等测试方法,对油页岩有机碳含量、氯仿沥青"A"、正构烷烃、生物标记化合物和芳烃等特征进行了分析。结果表明:海石湾油页岩有机碳含量很高,为20.90%~36.10%,平均为28.03%;氯仿沥青"A"含量为0.07%~0.32%,平均为0.20%;饱和烃含量为43.90%~44.10%,饱/芳比值为2~3,表明海石湾油页岩属于品质较好的油页岩,有机质类型以腐泥型为主。饱和烃和芳烃特征表明油页岩有机质母质来源以水生物为主,同时有高等陆源植物的输入。海石湾油页岩形成于弱氧化-弱还原淡水湖滨环境,有机质演化已进入成熟阶段(Ro为0.79%~0.82%)。对比开采时间不同的油页岩,认为暴露时间会影响有机质丰度、氯仿沥青"A"含量及其族组成,而对沉积环境和成熟度的研究则没有影响。更多还原

【Abstract】 In order to study the geochemical characteristics and sedimentary environment of high quality oil shale from the Middle Jurassic in Minhe Basin,organic carbon content,bitumen " A",n-alkanes distribution,biomarkers and aromatic hydrocarbons features for oil shale are discussed by using organic carbon content and GC-MS analysis method. The results show that oil shale is characterized by high organic content from 20. 9% to 36. 1%;Chloroform bitumen " A" content varies from 0. 2% to 0. 3%; Saturated hydrocarbons ranged from 43. 9% ~ 44. 1%and saturated hydrocarbon / aromatic hydrocarbon ratios are from 2 to 3,indicating that high quality oil shale is sapropelic. GC-MS characteristics of saturated hydrocarbon and aromatic hydrocarbon show that the organic matters of Haishiwan oil shale are mainly derived from aquatic organisms with little terrestrial input. And oil shales were formed under a weak oxidation-reduction of freshwater lacustrine environment,and reached a mature stage. Comparison of oil shale samples exposed for different time indicates exposure time greatly affects the abundance of TOC content and soluble oil quantity,but has no influence on the determination of maturity and depositional environment.更多还原