Geochemical Characteristics of Source Rock from Upper Permian Longtan Formation in Sichuan Basin

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  • 1.Key Laboratory of Petroleum Resources,Gansu Province/Key Laboratory of Petroleum Resources Research,
    Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou 730000,China;
    2.The 2nd Institute of Geology and Mineral Exploration,Lanzhou 730020,China

Received date: 2015-04-28

  Revised date: 2015-06-03

  Online published: 2015-08-10

Abstract

Through geochemical analysis of core and outcrop source rocks from the Upper Permian Longtan Formation in Sichuan Basin,organic matter type and redox depositional conditions were discussed through organic carbon and biomarker characteristics.The results show that the content of TOC and TOS has fluctuation in the profile,showing obvious heterogeneity.The n-alkanes in coal and carbonaceous mudstone of Upper Permian Longtan Formation are mainly unimodally distributed with relatively high abundance of high carbon number n-alkanes.However,the n-alkanes in shale of Upper Permian Longtan Formation are mainly bimodally distributed with phytanic advantage,and the main peak of the front mode was at nC17,in contrast,the main peak of the back mode was at nC25 or nC27.These results indicate that the organic matter in Longtan shale is mainly of aquatic and continental organic matter input,whereas the organic matter in Longtan coal and mudstone are terrestrial organic matter input.

Cite this article

WEI Zhi-fu,WANG Yong-li,WU Chen-jun,WU Bao-xiang,SUN Ze-peng,LI Sheng-xi,WEI Wei . Geochemical Characteristics of Source Rock from Upper Permian Longtan Formation in Sichuan Basin[J]. Natural Gas Geoscience, 2015 , 26(8) : 1613 -1618 . DOI: 10.11764/j.issn.1672-1926.2015.08.1613

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