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The Acoustic Characteristics of Tectonically Deformed Coal in Huaibei Coalfield

Author

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  • Xiong Song

    (Laboratory of Coalbed Methane Resources & Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China
    School of Resource and Earth Science, China University of Mining and Technology, Xuzhou 221116, China)

  • Tongjun Chen

    (Laboratory of Coalbed Methane Resources & Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China
    School of Resource and Earth Science, China University of Mining and Technology, Xuzhou 221116, China)

  • Dengliang Zhang

    (Geophysical Survey Team of Hebei Province Coal Geological Bureau, Xingtai 054099, China)

Abstract

Tectonically deformed coal (TDC) is closely related to gas outbursts. Since TDC exploration is an essential objective for coalfield exploration, it is of great significance to study the petrophysical properties of TDCs and explore their differences. This study collected 17 TDCs and undeformed coal samples from the Huaibei coalfield and ultrasonically tested their petrophysical parameters, including densities, P- and S-wave velocities, and their derived petrophysical parameters (V P /V S ratio, P- and S-wave impedances). Undeformed coal and TDCs with different deformation types (brittle, shear, and plastic deformations) show significant differences in their petrophysical parameters, and cross-plot analysis can directly differentiate them. As with traditional geological methods, acoustically measured petrophysical parameters are good indicators to determine the type of coal deformation. However, the TDCs with the same deformation type have similar petrophysical parameters; it is not easy to distinguish them directly. Instead, the proposed method incorporating principal component analysis and clustering can accurately distinguish up to five classes of TDCs. Different types of tectonic deformation environments and their intensities are highly correlated with the clustering results. This paper also provides essential petrophysical parameters for undeformed coal and TDCs in the Huaibei coalfield, and these parameters can help interpret undeformed coal and TDCs using wireline logs and seismic data.

Suggested Citation

  • Xiong Song & Tongjun Chen & Dengliang Zhang, 2023. "The Acoustic Characteristics of Tectonically Deformed Coal in Huaibei Coalfield," Energies, MDPI, vol. 16(13), pages 1-15, July.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:13:p:5179-:d:1187392
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    References listed on IDEAS

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    1. Bin Huang & Rui Xu & Cheng Fu & Ying Wang & Lu Wang, 2018. "Thief Zone Assessment in Sandstone Reservoirs Based on Multi-Layer Weighted Principal Component Analysis," Energies, MDPI, vol. 11(5), pages 1-13, May.
    2. Jun Lu & Yun Wang & Jingyi Chen, 2018. "Detection of Tectonically Deformed Coal Using Model-Based Joint Inversion of Multi-Component Seismic Data," Energies, MDPI, vol. 11(4), pages 1-17, April.
    3. Yingjin Wang & Dameng Liu & Yidong Cai & Xiawei Li, 2019. "Variation of Petrophysical Properties and Adsorption Capacity in Different Rank Coals: An Experimental Study of Coals from the Junggar, Ordos and Qinshui Basins in China," Energies, MDPI, vol. 12(6), pages 1-19, March.
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