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Distribution of Upper Paleozoic Coal Seams in the Southeastern Ordos Basin

Author

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  • Yunwen Guan

    (State Key Laboratory of Continental Dynamics, Northwest University, Xi’an 710069, China
    Department of Geology, Northwest University, Xi’an 710069, China)

  • Qijun Guo

    (Sinopec Petroleum Exploration and Production Research Institute, Beijing 100083, China)

  • Renhai Pu

    (State Key Laboratory of Continental Dynamics, Northwest University, Xi’an 710069, China
    Department of Geology, Northwest University, Xi’an 710069, China)

  • Xiaoping Gao

    (Yanchang Petroleum Group Exploration Company, Yan’an 716000, China)

  • Shuo Chen

    (State Key Laboratory of Continental Dynamics, Northwest University, Xi’an 710069, China
    Department of Geology, Northwest University, Xi’an 710069, China)

  • Tianyu Ji

    (Research Institute of Petroleum Exploration and Development, Petrochina, Beijing 100083, China)

Abstract

The Ordos Basin contains abundant coal resources in the Upper Paleozoic strata. They are shallowly buried or exposed in the periphery of the basin, forming recoverable coal mines and coalbed methane resources. For the deeply buried coal seams of the basin, however, due to complex changes and difficult mining, less attention was paid before. In recent years, with the exploitation of tight gas related to coal source rocks, a large amount of drilling and seismic data has been accumulated in the southeastern Ordos Basin, which makes it possible to study the distribution change and factors controlling Upper Paleozoic coal seams. Delineation of deep coal development and distribution is an important basis for coal, coalbed methane and related tight gas resources in the Upper Paleozoic. We use core, logging and seismic data to analyze the coal geophysics, thickness variation, paleotopography and sedimentary facies in the southeastern Ordos Basin. The lower part of the Shanxi Formation (Fm.) and the upper part of the Taiyuan Fm. in the southeastern part of the basin are characterized by low natural gamma ray, low density, high resistivity and high sonic logging values. As the coal velocity is very low and alternates with the high-velocity Taiyuan Fm. and Ordovician limestones, the two sets of coals below and above the Taiyuan limestones form an extremely strong-amplitude reflection in the seismic profile. The two sets of coals are cumulatively 1–10 m thick, averaging 2.4 m, and 4 m is the maximum induvial thickness. The individual coal seams thicker than 2 m cover an area of approximately 2500 km 2 , and the burial depths of the coal seam range from 2500 to 3000 m. The thick coal seams of the Taiyuan Fm. are mainly distributed proximally in the Ordovician paleokarst depression, while the Ordovician paleokarst depression without incised origin was deposited by distal coeval limestone rocks. There is a complementary relationship between the coal seams and the thickened zone of distributary channel sandstone in the Shanxi Fm.

Suggested Citation

  • Yunwen Guan & Qijun Guo & Renhai Pu & Xiaoping Gao & Shuo Chen & Tianyu Ji, 2022. "Distribution of Upper Paleozoic Coal Seams in the Southeastern Ordos Basin," Energies, MDPI, vol. 15(14), pages 1-15, July.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:14:p:5110-:d:861771
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    References listed on IDEAS

    as
    1. Xiaowei Feng & Nong Zhang & Xiaoting Chen & Lianyuan Gong & Chuangxin Lv & Yu Guo, 2016. "Exploitation Contradictions Concerning Multi-Energy Resources among Coal, Gas, Oil, and Uranium: A Case Study in the Ordos Basin (Western North China Craton and Southern Side of Yinshan Mountains)," Energies, MDPI, vol. 9(2), pages 1-15, February.
    2. Xiaoji Zeng & Zhifeng Liu & Chunyang He & Qun Ma & Jianguo Wu, 2018. "Quantifying Surface Coal-Mining Patterns to Promote Regional Sustainability in Ordos, Inner Mongolia," Sustainability, MDPI, vol. 10(4), pages 1-17, April.
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    Cited by:

    1. Hanwen Yu & Jiaren Ye & Qiang Cao & Yiming Liu & Wei Zhang, 2023. "Study on the Tight Gas Accumulation Process and Model in the Transition Zone at the Margin of the Basin: A Case Study on the Permian Lower Shihezi Formation, Duguijiahan Block, Ordos Basin, Northern C," Energies, MDPI, vol. 16(3), pages 1-30, February.

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