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To assess deep coalbed methane resource potential and establish a standardized evaluation methodology.

May 29, 2026Energy Geoscience0 citationsOpen Access

Prospects and exploration directions of deep coalbed methane resources in China

Key Points

To assess deep coalbed methane resource potential and establish a standardized evaluation methodology.
Defined accumulation mechanisms of deep CBM.
Established resource evaluation methodology for different exploration stages.
Classified deep CBM resources and identified key exploration targets.
Estimated in-situ resources at 37.44 × 10^12 m^3, with 16.51 × 10^12 m^3 recoverable.
Resources mainly found at depths over 1500 m in central and western basins.
Identified high-potential exploration targets in Ordos, Sichuan, and Xinjiang basins.

Abstract

The assessment of deep coalbed methane (CBM) resource potential provides a critical scientific basis for the formulation of national energy policies and the strategic development planning of China National Petroleum Corporation (CNPC). This study systematically defines the accumulation mechanisms of deep CBM and establishes a standardized resource evaluation methodology applicable to regions at various exploration stages. The study further clarifies the objectives, significance, and classification criteria of deep CBM resources. The estimated in-situ resources of deep CBM in China's major basins are 37.44 × 10 12 m 3 , with technically recoverable resources amounting to 16.51 × 10 12 m 3 . These resources are mainly distributed at depths >1500 m within central and western sedimentary basins, primarily hosted in Carboniferous, Permian, and Jurassic coal seams. The majority of these resources are classified as levels I and II, indicating substantial exploration and development potential. Key future exploration and development targets include the No. 8 and No. 5 coal seams in the eastern and central Ordos Basin, the high-pressure CBM reservoirs in the central Sichuan Basin, and the mixed-origin gas reservoirs in the Junggar, Tarim, and Turfan-Hami basins of Xinjiang, China.

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