Organic Matter Characteristic and Sedimentary Environment of the Lower Cambrian Niutitang Shale in Southeastern Chongqing

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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.University of Chinese Academy of Sciences,Beijing 100049,China;3.Xinjiang Oilfield Company Experiment and Detection Research Institute,Karamay 834000,China)
     

Received date: 2013-12-08

  Revised date: 2014-02-21

  Online published: 2014-08-10

Abstract

The Lower Cambrian Niutitang shale is not only the source rocks for Sinian conventional gas reservoirs but also one of the most prospective strata for shale gas exploration and development.In order to study the vertical variation,the controlling factors of sedimentary environment onrich organic matter in Niutitang shale,organic carbon and sulfur content,Rock-Eval pyrolysis,organic carbon isotopes,and mineral composition of shale samples were analyzed.The results show that shale samples are enriched in organic matter (TOC  varing from 2.43% to 9.89% with an average of 7.0%),indicating typical marine Type Ⅰ kerogen (δ13Corg ranging from -32.4‰ to -31.1‰).Researches on biomarkers indicates that the organic matter in Niutitang shale is derived from low grade hydrobiont and algae.The higher relative abundance of sulfur and pyrite show rich organic matter deposited in strong reducing sedimentary environment.The average content of quartz and clay mineral of Niutitang shale are 61% and 17.6%,respectively.The relationship among quartz,clay mineral and organic matter content show Niutitang shale has higher amount of quartz and organic matter in deep sea.

 

 

 
 

Cite this article

WU Chen-jun,ZHANG Ming-feng,MA Wan-yun,LIU Yan,XIONG De-ming,SUN Li-na,TUO Jin-cai . Organic Matter Characteristic and Sedimentary Environment of the Lower Cambrian Niutitang Shale in Southeastern Chongqing[J]. Natural Gas Geoscience, 2014 , 25(8) : 1267 -1274 . DOI: 10.11764/j.issn.1672-1926.2014.08.1267

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