Study on Multifractal of Coal Pore Structure Based on Low Pressure Argon Adsorption and Its Effect on Gas Adsorption/Desorption

Although the coal pore structure is attracting the attentionofresearchers, studies on the multifractal and gas adsorption/desorptioncapacity are relatively few. In this study, multifractal characteristicswere analyzed, and their effects on gas adsorption/desorption werediscussed. The results showed that metamorphism and tectonism affectedgas adsorption/desorption by changing the coal pore structure. Thelimit gas adsorption volume and initial desorption rate of tectoniccoals increased by 3.9%-23.9% and 1.96-2.7 times, respectively.The information dimension (D (1)), correlationdimension (D (2)), and classical Hurst indexgradually decreased with metamorphism and tectonism, while the Hausdorffdimension and & UDelta;& alpha; gradually increased, indicating thatpore size distribution (PSD) was more decentralized or inhomogeneous.The evaluation results of the correlation between multifractal parametersand complexity confirmed its accuracy in assessing pore complexity.Multifractal parameters have a significant impact on gas adsorption/desorptioncapacity overall, mainly by reflecting the concentration degree,local density, and homogeneity of pores.

Automated summary

This study analyzed multifractal characteristics and their effects on gas adsorption/desorption. The results showed that metamorphism and tectonism affected gas adsorption/desorption by changing the coal pore structure. Multifractal parameters have a significant impact on gas adsorption/desorption capacity overall.