抚顺盆地始新统烃源岩有机地球化学特征及成因  

Characteristics and origin of organic geochemistry from the Eocene source rocks,Fushun basin,Liaoning province

作　　者：许圣传[1,2] 刘招君[1] 董清水[1] 柳蓉[1] 孟庆涛[1] 胡晓峰[1] 

机构地区：[1]吉林大学地球科学学院,吉林长春130062 [2]石家庄经济学院资源学院,河北石家庄050031

出　　处：《中国矿业大学学报》2013年第5期790-800,共11页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(40972076)

摘　　要：为了揭示煤系与湖相烃源岩有机地球化学特征及成因差异,采用沉积与有机地球化学相结合的方法,综合对比了抚顺盆地始新统烃源岩的沉积环境、有机质类型、丰度和生物标记化合物参数,认为不同沉积环境中水体性质、有机质来源、生产率和保存条件的差异造成有机地球化学特征的改变.结果表明：古城子组烃源岩具有总体大于10%的TOC（总有机碳）和小于5%的饱和烃含量,生物标记化合物参数（高Pr＋Ph含量和藿烷/甾烷）显示有机质来自淡水沼泽中的高等植物;计军屯组纹层状油页岩和γ-蜡烷表明湖泊水体的加深和咸化,水生有机质增加和稳定水体分层造成中等-高的TOC和逐渐升高的饱和烃含量;西露天组烃源岩具有强烈变化的TOC（0.23%~16.91%）和继承性可溶有机质组分,β-胡萝卜烷指示有机质来自高生产力的浅水、咸化湖泊藻类.因此,沉积环境的改变引起有机质来源和生产率的变化,湖泊水体分层与否控制水体中有机质保存,沉积旋回（短期基准面变化）造成垂向有机质丰度的改变.In order to investigate the organic geochemistry characteristics and origin difference of coal-bearing ＆ lacustrine source rocks, using the method of sedimentary and organic geo- chemistry concluded that the differences of water property, orgin of organic matter, productivi- ty and preservation condition caused the change of the organic geochemistry characteristics in different depositional environments after comparing the organic matter type, abundance and bio-marker parameter of Eocene source rocks from the Fushun basin. The results show that. the source rock of the Guchengzi formation is characterized by totally ~I0~ TOC （Total Or- ganic Carbon） and ~5 % saturated hydrocarbon, and the bio-marker features （e. g. , Prq-Ph content and Hopane/Sterane ratio） are consistent with organic input original from high plant with fresh water~ Laminated oil shale and Gammacerane occurrence of the Jijuntun formation indicate the deepening and salination of basin lake water, thus, the increased aquatic organic matter and stable water stratification result in medium to high TOC and elevated saturated hy- drocarbon content; the source rock of the Xilutian formation has intensively variable TOC（ranging from 0.23o/oo to 16. 91%） and inherited character of soluble organic component, fur- thermore, abundant β-Carotane implies that the organic matter result from algae deposited in shallow and saline lake. Therefore, the change of deposition environment caused the variation of organic matter origin and primary productivity rate, whether the saline water stratification or not controlled the preservation of deposited organic matter, and deposition cycle （short-scale base level lift） resulted in the vertical change of organic matter abundance.

关 键 词：抚顺盆地 始新统 地球化学 煤 油页岩 生物标记化合物 藻类 

分 类 号：P618.12[天文地球—矿床学] TE121.1[天文地球—地质学]