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Volume 18
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10.3390/en18030699
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Article

Gas Content and Gas Occurrence Mechanism of Deep Coal Seams in the Shenfu-Linxing Block

by
Litao Ma
1,2,
Fan Yang
3,*,
Jianghao Yang
1,2,
Yi Cui
4,
Wei Wang
1,2,
Cheng Liu
1,2,
Bo Zhang
1,2,
Jiang Yang
1,2 and
Shu Tao
5,*
1
CNOOC EnerTech-Drilling & Production Co., Tianjin 300452, China
2
CNOOC Energy Technology & Services Limited Key Laboratory for Exploration & Development of Unconventional Resources, Tianjin 300452, China
3
PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China
4
Zhalainuoer Coal Industry Co., Ltd., Hulunbuir 021410, China
5
School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
*
Authors to whom correspondence should be addressed.
Energies 2025, 18(3), 699; https://doi.org/10.3390/en18030699
Submission received: 14 January 2025 / Revised: 29 January 2025 / Accepted: 29 January 2025 / Published: 3 February 2025
(This article belongs to the Special Issue Exploration and Development of Unconventional Oil and Gas Resources: Latest Advances and Prospects: 2nd Edition)
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Abstract

The Shenfu-Linxing block in the Ordos Basin holds abundant deep coalbed methane (CBM) resources, which can alleviate gas shortages and aid dual carbon target achievement. Considering isothermal adsorption traits and parameters like vitrinite reflectance, temperature, pressure, and water saturation, a prediction model for adsorbed and free gas content was formulated. This model helps to reveal the deep CBM occurrence mechanism in the Shenfu-Linxing block. Results show that deep CBM exists in both adsorbed and free states, with adsorbed gas initially increasing then decreasing, and free gas rising then stabilizing as burial depth increases. A critical transition depth for total CBM content exists, shallowing with higher water saturation. As depth increases, temperature and pressure evolution results in a “rapid growth—slow growth—stability—slow decrease” pattern in total gas content. Adsorbed gas resides in micropores, while free gas occupies larger pores.
Keywords: prediction model; gas content; coalbed methane; occurrence characteristics prediction model; gas content; coalbed methane; occurrence characteristics

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MDPI and ACS Style

Ma, L.; Yang, F.; Yang, J.; Cui, Y.; Wang, W.; Liu, C.; Zhang, B.; Yang, J.; Tao, S. Gas Content and Gas Occurrence Mechanism of Deep Coal Seams in the Shenfu-Linxing Block. Energies 2025, 18, 699. https://doi.org/10.3390/en18030699

AMA Style

Ma L, Yang F, Yang J, Cui Y, Wang W, Liu C, Zhang B, Yang J, Tao S. Gas Content and Gas Occurrence Mechanism of Deep Coal Seams in the Shenfu-Linxing Block. Energies. 2025; 18(3):699. https://doi.org/10.3390/en18030699

Chicago/Turabian Style

Ma, Litao, Fan Yang, Jianghao Yang, Yi Cui, Wei Wang, Cheng Liu, Bo Zhang, Jiang Yang, and Shu Tao. 2025. "Gas Content and Gas Occurrence Mechanism of Deep Coal Seams in the Shenfu-Linxing Block" Energies 18, no. 3: 699. https://doi.org/10.3390/en18030699

APA Style

Ma, L., Yang, F., Yang, J., Cui, Y., Wang, W., Liu, C., Zhang, B., Yang, J., & Tao, S. (2025). Gas Content and Gas Occurrence Mechanism of Deep Coal Seams in the Shenfu-Linxing Block. Energies, 18(3), 699. https://doi.org/10.3390/en18030699

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