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

Litao Ma, Fan Yang (), Jianghao Yang, Yi Cui, Wei Wang, Cheng Liu, Bo Zhang, Jiang Yang and Shu Tao ()
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Litao Ma: CNOOC EnerTech-Drilling & Production Co., Tianjin 300452, China
Fan Yang: PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China
Jianghao Yang: CNOOC EnerTech-Drilling & Production Co., Tianjin 300452, China
Yi Cui: Zhalainuoer Coal Industry Co., Ltd., Hulunbuir 021410, China
Wei Wang: CNOOC EnerTech-Drilling & Production Co., Tianjin 300452, China
Cheng Liu: CNOOC EnerTech-Drilling & Production Co., Tianjin 300452, China
Bo Zhang: CNOOC EnerTech-Drilling & Production Co., Tianjin 300452, China
Jiang Yang: CNOOC EnerTech-Drilling & Production Co., Tianjin 300452, China
Shu Tao: School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China

Energies, 2025, vol. 18, issue 3, 1-15

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 (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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