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multi-scale pore fractal characteristics of differently ranked coal and its impact on gas adsorption

International Journal of Mining Science and Technology 2023年第4期33卷 389-401页

作者： Zhongbei Li Ting Ren Xiangchun Li Ming Qiao Xiaohan Yang Lihai Tan Baisheng Nie School of Civil MiningEnvironmental and Architectural EngineeringUniversity of WollongongNew South Wales 2522Australia School of Safety Engineering China University of Mining and TechnologyXuzhou 221116China School of Emergency Management and Safety Engineering China University of Mining and Technology-BeijingBeijing 100083China State Key Laboratory of Coal Mine Disaster Dynamics and Control School of Resources and Safety EngineeringChongqing UniversityChongqing 400044China

Well-developed pores and cracks in coal reservoirs are the main venues for gas storage and *** investigate the multi-scale pore fractal characteristics,six coal samples of different rankings were studied using high-pressure mercury injection(HPMI),low-pressure nitrogen adsorption(LPGA-N2),and scanning electron microscopy(SEM)test *** on the Frankel,Halsey and Hill(FHH)fractal theory,the Menger sponge model,pores and Cracks Analysis System(PCAS),pore volume complexity(D_(v)),coal surface irregularity(Ds)and pore distribution heterogeneity(D_(p))were studied and evaluated,*** effect of three fractal dimensions on the gas adsorption ability was also analyzed with high-pressure isothermal gas adsorption *** show that pore structures within these coal samples have obvious fractal characteristics.A noticeable segmentation effect appears in the Dv1and Dv2fitting process,with the boundary size ranging from 36.00 to 182.95 nm,which helps differentiate diffusion pores and seepage *** D values show an asymmetric U-shaped trend as the coal metamorphism increases,demonstrating that coalification greatly affects the pore fractal *** three fractal dimensions can characterize the difference in coal microstructure and reflect their influence on gas adsorption *** volume(V_(L))has an evident and positive correlation with Dsvalues,whereas Langmuir pressure(P_(L))is mainly affected by the combined action of Dvand *** study will provide valuable knowledge for the appraisal of coal seam gas reservoirs of differently ranked coals.

关键词： multi-scale pore structure Fractal theory Fractal characteristics Differently ranked coal Coalbed gas adsorption

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