首页|Effects of source facies and maturity on individual carbon isotopic compositions of oil

Effects of source facies and maturity on individual carbon isotopic compositions of oil

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Carbon isotopes have been used extensively in tracing the sources of oil.However,primary source facies and secondary alteration controls on oil isotopic compositions have not been well resolved,resulting in application uncertainties.A case study was undertaken for an alkaline lacustrine oil system in a lower Permian formation in the Junggar Basin,NW China.Results indicate that increasing maturity causes the carbon isotopic composition to become heavier for only short-middle-chain compounds,whereas source facies-related carbon assimilation controls the compositions of short-,middle-,and long-chain compounds.In particular,light-carbon assimilation during organic-matter degradation makes the iso-topic composition lighter,whereas heavy carbon from the water mass makes it heavier.Accordingly,oils in this study area were divided into Type U and Type N oils based on individual compound carbon iso-topic compositions,reflecting the difference in source facies in a highly saline and reducing stratified water environment.The results provide a better understanding of the controls on carbon isotopes in oil in sedimentary basins,reducing the uncertainty in oil-source correlation and addressing the origin of oil.

Carbon assimilationWater stratificationCarbon isotopesAlkaline lacustrineJunggar Basin

Jingkun Zhang、Jian Cao、Baoli Xiang

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State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008,China

MOE Key Laboratory of Surficial Geochemistry,School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023,China

Research Institute of Experiment and Testing,PetroChina Xinjiang Oilfield Company,Karamay,Xinjiang 834000,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of China

4210214842230808

2024

地学前缘(英文版)
中国地质大学(北京) 北京大学

地学前缘(英文版)

CSTPCD
影响因子:0.576
ISSN:1674-9871
年,卷(期):2024.15(5)
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