The reason of high nitrogen content and low hydrocarbon content of shalegas from the Lower Cambrian Niutitang Formation in southeast Chongqing

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  • 1.Key Laboratory of Shale Gas Exploration,Ministry of Land and Resources,Chongqing Institute of Geology and
    Mineral Resources,Chongqing 400042,China;2.Chongqing Engineering Research Center for Shale Gas
    Resource & Exploration,Chongqing Institute of Geology and Mineral Resources,Chongqing 400042,China;
    3.Chongqing Shale Gas Research Center of State Key Laboratory of Petroleum Resource and Prospecting,Chongqing 400042,China;
    4.China University of Petroleum,Beijing 102249,China

Received date: 2017-07-01

  Revised date: 2017-09-28

  Online published: 2017-12-10

Abstract

Focus on the complexity of the Lower Cambrian Niutitang Formation that high total organic content,low hydrocarbon content and high nitrogen content,based on gas compound and genetic type,isotope,fluid inclusion and tectonic evolution analysis were done to trace nitrogen origin,which could help to understand why Niutitang Formation has high nitrogen content.Finally combined with exploration practice,the destruction model of shale gas was built,which could be the reference of evaluation and deployment.Nitrogen content of shale gas from the Lower Cambrian Niutitang Formation was above 90% and hydrocarbon is below 3%.The nitrogen gas was from air and organic evolution.The regional decollement zone at the bottom of the Lower Cambrian Niutitang Formation and the unconformity above the Dengying Formation were connected with the deep-large fault,which was the main pathway of gas dissipation and water intrusion.The three main destruction factors were poor bottom preservation condition,deep-large fault development and frequent fluid activities,which were the main reasons of high nitrogen content and low hydrocarbon content of shale gas from the Lower Cambrian Niutitang Formation in southeast Chongqing.
 

Cite this article

Jiao Wei-wei,Wang Sheng-xiu,Cheng Li-jun,Luo Qing-yong,Fang Guang-jian . The reason of high nitrogen content and low hydrocarbon content of shalegas from the Lower Cambrian Niutitang Formation in southeast Chongqing[J]. Natural Gas Geoscience, 2017 , 28(12) : 1882 -1890 . DOI: 10.11764/j.issn.1672-1926.2017.11.017

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