Methane Emissions and Gas Dynamics in Coal Basins

Methane emissions from coal basins represent both a significant hazard in underground mining and a major contributor to global greenhouse gas loads. In situ gas stored within coal seams can be released during mining operations or via natural fractures and faults, influencing local atmospheric concentrations and posing explosion risks. Gas dynamics in these environments are governed by geological structure, coal rank, depth of extraction and pressure–temperature regimes. Coal’s sorption capacity controls the volume of gas that can be held at a given pressure, while changes in external conditions—such as atmospheric pressure fluctuations or mine dewatering—can induce desorption and microseepage to surface soils and mine workings. Effective methane drainage systems and real-time monitoring of gas flux allow for capture and utilisation of methane as an energy resource, reducing emissions and improving safety. Numerical and statistical models, including artificial neural networks, have been employed to forecast emission rates and to inform strategies for drainage, ventilation and post-closure risk management. Advances in remote sensing and soil-gas sampling techniques have enhanced characterisation of emission hotspots and microseepage pathways. Integrating geological, mining and atmospheric data is essential for developing robust mitigation measures, facilitating cleaner energy recovery and aligning coal basin management with climate-action goals.

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Methane Emissions and Gas Dynamics in Coal Basins publication trend

The graph below shows the total number of articles in methane emissions and gas dynamics in coal basins across all publications each year (not limited to Nature Index journals).

Technical terms

Goaf: A void left by the removal of coal, often sealed and subject to gas accumulation and release under pressure changes.

Hysteresis loop (methane release): The non-linear desorption and adsorption response of coal to cyclic pressure variations, leading to differing release rates.

Sorption capacity: The maximum volume of gas that coal can adsorb at a given pressure and temperature, influencing emission potential.

Microseepage: The slow migration of gas through fractures or porous media from subsurface reservoirs to the surface or mine workings.

Methane drainage system: Engineered network of boreholes and pipelines designed to extract and control methane emissions from coal seams and goafs.

References

1. The Impact of Atmospheric Pressure Changes on Methane Emission from Goafs to Coal Mine Workings. Energies (2023).
2. Forecasting Methane Emissions from Hard Coal Mines Including the Methane Drainage Process. Energies (2019).
3. Geological and Mining Factors Controlling the Current Methane Conditions in the Rydułtowy Coal Mine (Upper Silesian Coal Basin, Poland). Energies (2022).