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Paleoenvironment and Organic Matter Accumulation Mechanism of Marine–Continental Transitional Shales: Outcrop Characterizations of the Carboniferous–Permian Strata, Ordos Basin, North China

Author

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  • Leifu Zhang

    (Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation (CNPC), Beijing 100083, China
    National Energy Shale Gas Research & Development (Experiment) Center, Langfang 065007, China
    CNPC Key Laboratory of Unconventional Oil and Gas, Langfang 065007, China)

  • Qun Zhao

    (Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation (CNPC), Beijing 100083, China
    National Energy Shale Gas Research & Development (Experiment) Center, Langfang 065007, China
    CNPC Key Laboratory of Unconventional Oil and Gas, Langfang 065007, China)

  • Sizhong Peng

    (Department of Geology, Northwest University, Xi’an 710069, China)

  • Zhen Qiu

    (Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation (CNPC), Beijing 100083, China
    National Energy Shale Gas Research & Development (Experiment) Center, Langfang 065007, China
    CNPC Key Laboratory of Unconventional Oil and Gas, Langfang 065007, China)

  • Congjun Feng

    (Department of Geology, Northwest University, Xi’an 710069, China)

  • Qin Zhang

    (Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation (CNPC), Beijing 100083, China
    National Energy Shale Gas Research & Development (Experiment) Center, Langfang 065007, China
    CNPC Key Laboratory of Unconventional Oil and Gas, Langfang 065007, China)

  • Yuman Wang

    (Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation (CNPC), Beijing 100083, China
    National Energy Shale Gas Research & Development (Experiment) Center, Langfang 065007, China
    CNPC Key Laboratory of Unconventional Oil and Gas, Langfang 065007, China)

  • Dazhong Dong

    (Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation (CNPC), Beijing 100083, China
    National Energy Shale Gas Research & Development (Experiment) Center, Langfang 065007, China
    CNPC Key Laboratory of Unconventional Oil and Gas, Langfang 065007, China)

  • Shangwen Zhou

    (Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation (CNPC), Beijing 100083, China
    National Energy Shale Gas Research & Development (Experiment) Center, Langfang 065007, China
    CNPC Key Laboratory of Unconventional Oil and Gas, Langfang 065007, China)

Abstract

In the Carboniferous–Permian period, several organic-rich black shales were deposited in a marine–continental transitional environment in the Linfen area on the eastern margin of the Ordos Basin. Integrated sedimentological and organic geochemical analyses are performed on an outcrop in order to clarify the relationship between paleoenvironment and organic matter accumulation. The results of this study show that the marine–continental transitional strata of the Upper Carboniferous Benxi Formation to Lower Permian Taiyuan and Shanxi Formation exposed in the Linfen area are composed of sandstone, shale, coal, and limestone. Total organic carbon (TOC) contents of the studied samples were mainly distributed in the range of 0.59%–35.4%, with an average of 7.32%. From Benxi Formation to Shanxi formation, the humidity gradually increased, and the climate gradually changed from hot and humid to warm and humid during Carboniferous to Permian. The deposition of the Shanxi Formation ended with the climate returning to hot and humid, having an oxic-suboxic conditions and a high paleoproductivity. Paleoredox conditions and paleoproductivity are the two vital factors controlling the formation of organic matter in black shales. The transitional environment characterized by oxic-suboxic, relatively high deposition rate, and various source of organic matter, although different from the marine environment, provides a good material basis for the deposition of organic-rich shales.

Suggested Citation

  • Leifu Zhang & Qun Zhao & Sizhong Peng & Zhen Qiu & Congjun Feng & Qin Zhang & Yuman Wang & Dazhong Dong & Shangwen Zhou, 2021. "Paleoenvironment and Organic Matter Accumulation Mechanism of Marine–Continental Transitional Shales: Outcrop Characterizations of the Carboniferous–Permian Strata, Ordos Basin, North China," Energies, MDPI, vol. 14(21), pages 1-19, November.
  • Handle: RePEc:gam:jeners:v:14:y:2021:i:21:p:7445-:d:674756
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    References listed on IDEAS

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    1. Haitao Guo & Yongsheng Wang & Zhongmin Wang, 2016. "Shale Development and China," Natural Resource Management and Policy, in: Yongsheng Wang & William E. Hefley (ed.), The Global Impact of Unconventional Shale Gas Development, pages 131-147, Springer.
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    Cited by:

    1. Ming Song & Xiangzhen Meng & Renhai Pu & Xiaoping Gao & Teng Qiang & Yujie Fan, 2023. "Controls on Gas-Reservoir Formation in the Benxi Formation in the Ganquan–Fuxian Area of the Ordos Basin, China," Energies, MDPI, vol. 16(19), pages 1-19, September.
    2. Qin Zhang & Wei Xiong & Xingtao Li & Congjun Feng & Zhen Qiu & Wen Liu & Xiang Li & Yufeng Xiao & Dan Liu & Haixing Yang, 2023. "Discussion on Transitional Shale Gas Accumulation Conditions from the Perspective of Source-Reservoir-Caprock Controlling Hydrocarbon: Examples from Permian Shanxi Formation and Taiyuan Formation in t," Energies, MDPI, vol. 16(9), pages 1-14, April.
    3. Zhongcheng Li & Zhidong Bao & Zhaosheng Wei & Hongxue Wang & Wanchun Zhao & Wentao Dong & Zheng Shen & Fan Wu & Wanting Tian & Lei Li, 2022. "Characteristics and Affecting Factors of K 2 qn 1 Member Shale Oil Reservoir in Southern Songliao Basin, China," Energies, MDPI, vol. 15(6), pages 1-21, March.

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