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Carbon Isotope Records Indicative of Paleoceanographical Events at the Latest Permian dalong formation at Shangsi,Northeast Sichuan,China

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Journal of China University of Geosciences 2008年第5期19卷 481-487页

作者：白晓罗根明吴夏王友贞黄俊华王新君 State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesWuhan 430074 China Key Laboratory of Biogeology and Environmental Geology of Ministry of Education China University of GeosciencesWuhan 430074 China

Paired organic and carbonate carbon isotope compositions of Late Permian Wujiaping （吴家坪） and dalong （大隆） formations at Shangsi （上寺）, Northeast Sichuan （四川） were analyzed by MAT 251. An abrupt negative excursion in the two isotope records was observed in the middle part of dalong formation, in association with a drop in the carbon isotope difference of the two records and an increase of total organic carbon （TOC） content. The negative drop of the paired carbon isotope records is suggestive of the input of 12C-enriched CO2. The molecular ratios of pristane to phytane and dibenzothiophene to phenanthrene indicate the anoxic condition in this interval. The enhanced TOC content is indicative of the elevated preservation of organic matter due to the anoxic condition. These isotopic and organic geochemical data probably infer the occurrence of the upwelling in this interval. The additional contribution of volcanism activity observed in South China cannot be excluded to the input of 12C-enriched CO2 and the negative shifts in carbon isotope composition of bulk organic matter and carbonate.

关键词： carbon cycle upwelling dalong formation Late Permian South China.

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Composition and distribution of NSO compounds in two different shales at the early maturity stage characterized by negative ion electrospray ionization coupled with Fourier transform ion cyclotron resonance mass spectrometry

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Petroleum Science 2018年第2期15卷 289-296页

作者： Chang-Wei Ke Yao-Hui Xu Xiang-Chun Chang Wei-Bin Liu Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University) Ministry of Education College of Resources and Environment Yangtze University College of Earth Science and Engineering Shandong University of Science and Technology Oil and Gas Survey China Geological Survey

Gas chromatography/mass spectrometry （GC/MS） can only analyze volatile molecular compounds, and it has limitations when applied to determine the complex components of crude oils and hydrocarbon source rocks. Based on Fourier transform ion cyclotron resonance mass spectrometry （FT-ICR-MS） and GC/MS analyses, the molecular compositions of NSO compounds in extracts from the Permian dalong formation, Sichuan Basin and the Permian Lucaogou formation, Junggar Basin in China were compared. Analyses of types of heteroatoms present （S~, $2, $3, OS, OS2, 02S, NS, and NOS compounds） suggest that marine shales from the dalong formation are mainly composed of carboxylic acids （02 com- pounds） with a high abundance of fatty acids, indicating a marine phytoplankton organic source. However, lacustrine shales from the Lucaogou formation are dominated by pyrrolic compounds （N1 compounds） with abundant dibenzocar- bazole. It suggests that the organic source materials may be derived from lower aquatic organisms and lacustrine algae. Overall, FT-ICR-MS has potential for applications in analyses and determination of depositional environments and organic sources in petroleum geology.

关键词： Fourier transform ion cyclotron resonance mass spectrometry dalong formation Lucaogou formation NSO compounds Sedimentary environment

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