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Occurrence, Classification and Formation Mechanisms of the Organic-Rich Clasts in the Upper Paleozoic Coal-Bearing Tight Sandstone, Northeastern Margin of the Ordos Basin, China

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  • Guanqun Yang

    (School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
    Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism, Ministry of Education, Beijing 100083, China
    Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering, Beijing 100083, China)

  • Wenhui Huang

    (School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
    Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism, Ministry of Education, Beijing 100083, China
    Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering, Beijing 100083, China)

  • Jianhua Zhong

    (School of Geosciences, China University of Petroleum, Qingdao 266580, China)

  • Ningliang Sun

    (School of Geosciences, China University of Petroleum, Qingdao 266580, China)

Abstract

The detailed characteristics and formation mechanisms of organic-rich clasts (ORCs) in the Upper Paleozoic tight sandstone in the northeastern margin of the Ordos Basin were analyzed through 818-m-long drilling cores and logging data from 28 wells. In general, compared with soft-sediment clasts documented in other sedimentary environments, organic-rich clasts in coal-bearing tight sandstone have not been adequately investigated in the literature. ORCs are widely developed in various sedimentary environments of coal-bearing sandstone, including fluvial channels, crevasse splays, tidal channels, sand flats, and subaqueous debris flow deposits. In addition to being controlled by the water flow energy and transportation processes, the fragmentation degree and morphology of ORCs are also related to their content of higher plants organic matter. The change in water flow energy during transportation makes the ORCs show obvious mechanical depositional differentiation. Four main types of ORC can be recognized in the deposits: diamictic organic-rich clasts, floating organic-rich clasts, loaded lamellar organic-rich clasts, and thin interlayer organic-rich clasts. The relationship between energy variation and ORCs deposition continuity is rarely studied so far. Based on the different handling processes under the control of water flow energy changes, we propose two ORCs formation mechanisms: the long-term altering of continuous water flow and the short-term water flow acting triggered by sudden events.

Suggested Citation

  • Guanqun Yang & Wenhui Huang & Jianhua Zhong & Ningliang Sun, 2020. "Occurrence, Classification and Formation Mechanisms of the Organic-Rich Clasts in the Upper Paleozoic Coal-Bearing Tight Sandstone, Northeastern Margin of the Ordos Basin, China," Energies, MDPI, vol. 13(11), pages 1-19, May.
  • Handle: RePEc:gam:jeners:v:13:y:2020:i:11:p:2694-:d:363481
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    Cited by:

    1. Reza Rezaee, 2022. "Editorial on Special Issues of Development of Unconventional Reservoirs," Energies, MDPI, vol. 15(7), pages 1-9, April.
    2. Zehou Xiang & Kesai Li & Hucheng Deng & Yan Liu & Jianhua He & Xiaoju Zhang & Xianhong He, 2021. "Research on Test and Logging Data Quality Classification for Gas–Water Identification," Energies, MDPI, vol. 14(21), pages 1-18, October.

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