松辽盆地南部上白垩统烃源岩和原油中正构烷烃的氢同位素组成研究  

Hydrogen isotopic compositions of n-alkanes in crude oils and extracts of Upper Cretaceous from southern Songliao Basin

作　　者：王彦美[1] 熊永强[1] 王立武[2] 苗洪波[2] 

机构地区：[1]中国科学院广州地球化学研究所有机地球化学国家重点实验室,广东广州510640 [2]中国石油吉林油田分公司,吉林松原131000

出　　处：《地球化学》2006年第6期602-608,共7页Geochimica

基　　金：国家自然科学基金(40372070);中国科学院知识创新工程领域前沿项目(GIGCX-04-08)

摘　　要：以松辽盆地南部上白垩统的烃源岩及原油为研究对象,对烃源岩抽提物和原油中正构烷烃的单体氢同位素组成进行了测定。生物标志化合物和正构烷烃的碳氢同位素组成特征表明,在未成熟—成熟阶段正构烷烃的单体氢同位素组成受热成熟度的影响不明显,可以作为油源对比的一个有用的辅助指标。氢同位素组成在母源判识以及重建古沉积环境方面可以提供更多的信息,与碳同位素组成结合应用具有一定的优势。Carbon and hydrogen isotopic compositions of n-alkanes in the Upper Cretaceous crude oils and source rock extracts from the southern Songliao Basin have been determined by GC-C-IRMS （gas chromatography combustion isotope ratio mass spectrometry） and GC-TC-IRMS （gas chromatography-thermal conversion-isotope ratio mass spectrometry）, respectively. The carbon and hydrogen isotopic signatures of n-alkanes in the crude oils and source rock extracts display relatively small variations, and δ^13C and δD values of n-alkanes rang from - 30‰ to - 33‰ and from - 160‰ to - 220‰, respectively, except few samples from Upper Cretaceous Nenjiang and Yaojia formations. Similar δD values of n-alkanes in samples in different maturity stages indicate that effect of thermal maturity on δD values of n-alkanes is not significant during the stages from immaturity to maturity, therefore, it can be used as a useful auxiliary tool for oil/source correlation. It has definite predominance to combine with the carbon and hydrogen isotopic compositions.

关 键 词：正构烷烃 碳同位素 氢同位素 生物标志化合物 上白垩统 松辽盆地 

分 类 号：P593[天文地球—地球化学]