Distribution and characterization of C_(31) sterane from cretaceous sediments and oils,Songliao Basin,China  

作　　者：J. M. Moldowan 

机构地区：[1]Department of Geological and Environmental Science, Stanford University

出　　处：《Chinese Science Bulletin》1999年第6期560-563,共4页

摘　　要：Relatively high abundance of C₃₁ steranes has been identified from cretaceous source rocks and crude oils in the Songliao Basin, China. C₃₁ steranes which occur as ten isomers were tentatively identified as 4, 22, 23, 24-tetrametyhlcholestane based on their retention time and mass spectrum.They bear a lower thermal stability and occur as important components in the immature oils of Chaochang region because they have three-methyl groups in their side chain. The relatively high abundance of C₃₁ steranes in the samples can indicate the source input of some special algae in the brackish and saline environment. Therefore they can be used as very useful biomarkers for organic facies analysis and oil correlation. Their biological source perhaps related to the dinoflagellate such as G. foliaceum and P. foliaceum. The gorgostanol are considered as possible precursors for the putative C₃₁4methyl sterane which formed in the stage of diagenesis.Relatively high abundance of C31 steranes has been identified from cretaceous source rocks and crude oils in the Songliao Basin, China. C31 steranes which occur as ten isomers were tentatively i-dentified as 4, 22, 23, 24-tetrametyhlcholestane based on their retention time and mass spectrum. They bear a lower thermal stability and occur as important components in the immature oils of Chaochang region because they have three-methyl groups in their side chain. The relatively high abundance of C31 steranes in the samples can indicate the source input of some special algae in the brackish and saline environment. Therefore they can be used as very useful biomarkers for organic facies analysis and oil correlation. Their biological source perhaps related to the dinoflagellate such as G. foli-aceum and P. foliaceum. The gorgostanol are considered as possible precursors for the putative C314-methyl sterane which formed in the stage of diagenesis.

关 键 词：C₃₁ STERANE ancient environment ALGAE oil correlation. 

分 类 号：P618.13[天文地球—矿床学]