A Review of Fractal Characterization Methods For Pore Structure in Coal Reservoirs
DOI:
https://doi.org/10.63313/CESS.4009Keywords:
Coal Reservoir, Pore Structure, Fractal Dimension, Multi-Method IntegrationAbstract
The pore structure of coal reservoirs exhibits significant heterogeneity. Fractal theory quantitatively characterizes the roughness of pore surfaces and the complexity of spatial structures through the fractal dimension (D). This study comprehensively reviews four primary methods for fractal characterization of coal pore structure: gas adsorption, mercury intrusion, nuclear magnetic resonance, and image analysis. It discusses the fractal models utilized in each method, their respective scopes, and conducts a comparative analysis of model and method variances. Furthermore, it consolidates prevalent multi-method joint testing approaches and elucidates the relationship between fractal dimension and pore structure parameters such as pore size distribution, specific surface area, and pore volume. These findings serve as a valuable resource for evaluating the physical properties of coal reservoirs and refining pore structure characterization.
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