• TAN Furong

  TAN Furong

  1 State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi’an 710069,China；2 State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China；3 China National Administration of Coal Geology,Beijing 10038,China；4 Shaanxi Mineral Resources and Geological Survey,Xian 710068,China
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• LI Yang

  LI Yang

  1 State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi’an 710069,China；2 State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China；3 China National Administration of Coal Geology,Beijing 10038,China；4 Shaanxi Mineral Resources and Geological Survey,Xian 710068,China
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• DU Fangpeng

  DU Fangpeng

  2 State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China；3 China National Administration of Coal Geology,Beijing 10038,China
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• LIU Shiming

  LIU Shiming

  2 State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China；3 China National Administration of Coal Geology,Beijing 10038,China
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• CUI Weixiong

  CUI Weixiong

  5 Xi’an Research Institute of China Coal Technology ＆ Engineering Group Corp.,Xi’an 710077,China
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• LIU Zhiwu

  LIU Zhiwu

  5 Xi’an Research Institute of China Coal Technology ＆ Engineering Group Corp., Xi’an 710077, China
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• GENG Qingming

  GENG Qingming

  3 China National Administration of Coal Geology,Beijing 10038,China
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• LU Ping

  LU Ping

  1 State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi’an 710069,China；2 State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China；3 China National Administration of Coal Geology,Beijing 10038,China；4 Shaanxi Mineral Resources and Geological Survey,Xian 710068,China
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This work was granted by the National Natural Science Foundation of China (Grant nos.41702144;41802212),the State Key Laboratory of Organic Geochemistry,GIGCAS (Grant no.SKLOG-201908),and the Fundamental Research Funds for the Central Universities (Grant no.2652018234).The authors would like to thank the Qinghai Coal Geology 105 Exploration Team for kindly providing part of the data in this study.Kang Huiling and Susan Turner (Brisbane)are thanked for their help with English language of this manuscript.We also want to thank anonymous manuscript reviewers for their constructive suggestions and comments which significantly improved the quality of this manuscript.