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Molecular Insights of Deep Coalbed Methane Adsorption Characteristics and Production Mechanisms in a Slit-Pore Model

  • 0CNPC Research Institute of Petroleum Exploration & Development, Beijing 100083, China.
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August 25, 2025

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August 25, 2025

View abstract on PubMed

Summary

This summary is machine-generated.

Deep coalbed methane (DCBM) production is optimized by pressure-control methods, which yield higher recovery than pressure-relief techniques. This study reveals DCBM adsorption and release mechanisms in multiscale pore models.

Area Of Science

  • Geosciences
  • Petroleum Engineering
  • Computational Chemistry

Background

  • Deep coalbed methane (DCBM) represents over 50% of global resources, yet extraction methods are underdeveloped.
  • Distinct reservoir characteristics of deep coal seams necessitate novel production strategies compared to shallow CBM.
  • Limited research exists on the specific adsorption and production behaviors of DCBM.

Purpose Of The Study

  • To investigate the adsorption behaviors of DCBM using a multiscale slit-pore model.
  • To analyze the production mechanisms of DCBM under different recovery strategies.
  • To understand the influence of pore structure on DCBM component distribution and release.

Main Methods

  • Development of a slit-pore model simulating micropores, macropores, and fractures in anthracite.
  • Utilization of molecular dynamics simulations to study adsorption and fluid flow.
  • Quantitative evaluation of pressure-relief and pressure-control production scenarios.

Main Results

  • DCBM components (CH4, C2H6, N2, CO2) show heterogeneous distribution, with higher concentrations of CH4, C2H6, and CO2 in micropores.
  • Monolayer adsorption of CH4, C2H6, and CO2 in micropores is unaffected by production methods.
  • Pressure-control production demonstrates superior DCBM recovery compared to pressure-relief production.

Conclusions

  • Fluid release from micropores during pressure-relief production is hindered by macropore mass transfer and micropore water-blocking effects.
  • Pressure-control production is more effective for maximizing DCBM recovery.
  • This study provides critical insights into DCBM adsorption and production mechanisms for enhanced resource utilization.