首页|Multi-scale pore fractal characteristics of differently ranked coal and its impact on gas adsorption
Multi-scale pore fractal characteristics of differently ranked coal and its impact on gas adsorption
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Well-developed pores and cracks in coal reservoirs are the main venues for gas storage and migration. To 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 scan-ning electron microscopy (SEM) test methods. Based on the Frankel, Halsey and Hill (FHH) fractal theory, the Menger sponge model, Pores and Cracks Analysis System (PCAS), pore volume complexity (Dv), coal surface irregularity (Ds) and pore distribution heterogeneity (Dp) were studied and evaluated, respec-tively. The effect of three fractal dimensions on the gas adsorption ability was also analyzed with high-pressure isothermal gas adsorption experiments. Results show that pore structures within these coal samples have obvious fractal characteristics. A noticeable segmentation effect appears in the Dv1 and Dv2 fitting process, with the boundary size ranging from 36.00 to 182.95 nm, which helps differen-tiate diffusion pores and seepage fractures. The D values show an asymmetric U-shaped trend as the coal metamorphism increases, demonstrating that coalification greatly affects the pore fractal dimensions. The three fractal dimensions can characterize the difference in coal microstructure and reflect their influ-ence on gas adsorption ability. Langmuir volume (VL) has an evident and positive correlation with Ds val-ues, whereas Langmuir pressure (PL) is mainly affected by the combined action of Dv and Dp. This study will provide valuable knowledge for the appraisal of coal seam gas reservoirs of differently ranked coals.
Multi-scale pore structureFractal theoryFractal characteristicsDifferently ranked coalCoalbed gas adsorption
Zhongbei Li、Ting Ren、Xiangchun Li、Ming Qiao、Xiaohan Yang、Lihai Tan、Baisheng Nie
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School of Civil,Mining,Environmental and Architectural Engineering,University of Wollongong,New South Wales 2522,Australia
School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China
School of Emergency Management and Safety Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China
State Key Laboratory of Coal Mine Disaster Dynamics and Control,School of Resources and Safety Engineering,Chongqing University,Chongqing 400044,China
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scholarship provided by China Scholarship CouncilUniversity of WollongongACARP ProjectNational Key Research and Development Program of ChinaNatural Science Foundation of Beijing Municipality,China
NETL
NSTL
万方数据
维普
