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GONG Jian-ming, ZHANG Li, CHEN Xiao-hui, et al. Discussion on Original Organic Types of Over Over-mature Source Rocks in Wuli Permafrost Zone of Qinghai-Tibeatean Plateau[J]. Northwestern Geology, 2014, 47(2): 208-215.
Citation: GONG Jian-ming, ZHANG Li, CHEN Xiao-hui, et al. Discussion on Original Organic Types of Over Over-mature Source Rocks in Wuli Permafrost Zone of Qinghai-Tibeatean Plateau[J]. Northwestern Geology, 2014, 47(2): 208-215.
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Discussion on Original Organic Types of Over Over-mature Source Rocks in Wuli Permafrost Zone of Qinghai-Tibeatean Plateau

  • 1. The Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources, Qingdao 266071, China;

  • 2. Qingdao Institute of Marine Geology, Qingdao 266071, China;

  • 3. Guangzhou Marine Geological Survey, MLR, Guangzhou 510760, China;

  • 4. School of Earth Environment and Water Resource, Yangtze University, Wuhan 430100, China;

  • 5. Qinghai Coal Geological Exploration Institute, Xi'ning 810001, China;

  • 6. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China

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  • Received Date: January 03, 2014
  • Revised Date: March 25, 2014
  • Available Online: July 28, 2022
  • Published Date: June 04, 2014
    Graphical Abstract
    • Abstract
  • In order to find out the original organic types of Wuli permafrost zone on Qinghai-Tibetan Plateau, the cores core samples are taken analyzed which are from gas-hydrate drilling hole (called referred to as ZK1) and its adjacent drilling holes are analyzed. The results show that the kerogen maceral from the ZK1 and adjacent drilling holesstudy area is mainly composed of vitrinite, accounting for 79.68%—83.62%, and some inertinite with a proportion of, respectively accounting for 79.68%—83.62% and 14.19%—18.35%. Therefore, it is can be inferred that the kerogen could be of Type Ⅲtype. On the baseis of biomakers, the ratios of Pr/nC17 and Ph/nC18 respectively get to 0.29—1.05 and 0.57—1.56, while the ratios of C23 tricyclic diterpane/C30 hopane and C27/C29 sterane respectively reach to 0.47—2.23 and 0.64—1.35. It will can be seen from these data that the kerogen could be classified into fall into TypeⅡ1 or TypeⅡ2 type. Considering that the fact that maturity of source rocks reaches to are in over mature evolution stage, it it could be summarized a conclusion that the original organic type of the source rocks was probably belongs to mixed typea mixture, while with some organic matters mainly could be originated mainly from inferior aquatic organisms.
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