Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (1): 29-38.doi: 10.13278/j.cnki.jjuese.20160296

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Effective Source Rocks in Jurassic Xinhe Formation in Sartai Sag, Yabrai Basin

Du Pengyan1,2, Gao Gang1, Wei Tao3, Zhao Leyi3, Yang Jun3, Li Tao3, Wang Jianguo3   

  1. 1. College of Geosciences, China University of Petroleum, Beijing 102249, China;
    2. School of Ocean and Earth Science, Tongji University, Shanghai 200092, China;
    3. Research Institute of Exploration and Development, Yumen Oilfield Company, CNPC, Jiuquan 735019, Gansu, China
  • Received:2017-02-07 Online:2018-01-26 Published:2018-01-26
  • Supported by:
    Supported by PetroChina Major Science and Technology Project(2013E-050209)

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Abstract: According to the hydrocarbon generation and expulsion mechanism, the authors analyzed the relationship between TOC content and rock pyrolysis parameter S1, determined the low limit value of effective source rock TOC content of the lower member of the Xinhe Formation shale in Sartai sag, Yabrai basin. The low limit value of TOC content in the Xinhe Formation shale of Yanchang subsag and Xiaohu subsag are 1.0% and 0.7% respectively, while the source rocks in the Xinhe Formation of Suotuo subsag are unsatisfied with the hydrocarbon expulsion condition. Using the Δlog R method, the authors calculated the TOC content of the Xinhe Formation shale, then recognized the effective source rocks in wells and got the distribution characteristics of effective source rocks referring to the sedimentary facies and statistic thickness of effective source rocks in wells. The effective source rocks of the lower member of the Xinhe Formation are mainly distributed within Xiaohu subsag with the maximum gross thickness adjacent to 600 m, basically less than 100 m in Yanchang subsag, and there are no effective source rocks in Suotuo subsag. The higher the thermal maturity is, the lower the low limit value of effective source rock TOC content.

Key words: effective source rocks, low limit value of TOC content, Xinhe Formation, Sartai sag, Yabrai basin

CLC Number: 

  • TE122
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