Compressibility and fractal dimension analysis in the bituminous coal specimens
Source abstract
Abstract
Coal is the typical multi-pore media. Numerous experiments have been done to investigate the pore structure of coal. Mercury intrusion porosimetry is still a popular way to analyze the pore characteristics. Compressibility effect on the mercury intrusion porosimetry data cannot be ignored. So N2 adsorption (NA) and mercury intrusion porosimetry (MIP) were applied to analyze the pore structure of coal. In this paper, the mercury intrusion process was divided into three stages including interpore filling, large intrapore filling, and small intrapore filling. The fractal analysis is an important mathematical method, which is widely used to evaluate heterogeneity in the size-dependent distribution of porosity. The fractal characteristics of pore structures in four coal samples with the same rank were also investigated. Three pore fractal dimensions corresponding to the three stages of mercury intrusion, D1C, D2C, and D3C were calculated with the Brooks–Corey capillary pressure model. Df calculated with Farin model is used to estimate an overall fractal dimension. The correlation between the pore fractal dimension and the pore size distribution (PSD) characteristics was further discussed.
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Research context
OpenAlex topics: Hydrocarbon exploration and reservoir analysis · Coal Properties and Utilization · NMR spectroscopy and applications
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Affiliations
School of Mechanics & Civil Engineering, China University of Mining and Technology (Beijing) 1 , Beijing 100083, China
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University 2 , Chongqing 400030, China
References (23)
Show source-provided references
1. Fractal dimensions of coal particles10.1016/0021-9797(87)90348-1 ↗
2. Fractal surface analysis by using nitrogen adsorption data: The case of the capillary condensation regime10.1021/la950877p ↗
3. Pore structure characterization of North American shale gas reservoirs using USANS/SANS, gas adsorption, and mercury intrusion10.1016/j.fuel.2012.06.119 ↗
4. Micro-pores and fractures of coals analysed by field emission scanning electron microscopy and fractal theory10.1016/j.fuel.2015.10.011 ↗
5. Fractal analysis of tight gas sandstones using high-pressure mercury intrusion techniques10.1016/j.jngse.2015.03.027 ↗
6. Chemistry in noninteger dimensions between two and three. I: Fractal theory of heterogeneous surfaces10.1063/1.446210 ↗
7. Pore structure and chloride permeability of concrete containing nano-particles for pavement10.1016/j.conbuildmat.2010.07.032 ↗
8. Role of coal type and rank on methane sorption characteristics of Bowen Basin, Australia coals10.1016/s0166-5162(99)00005-1 ↗
9. The closed pores of tectonically deformed coal studied by small-angle X-ray scattering and liquid nitrogen adsorption10.1016/j.micromeso.2015.11.057 ↗
10. Compressibility and fractal dimension of fine coal particles in relation to pore structure characterisation using mercury porosimetry10.1002/(sici)1521-4117(199905)16:1<25::aid-ppsc25>3.0.co;2-t ↗
11. Comparing the porosity and surface areas of coal as measured by gas adsorption, mercury intrusion and SAXS techniques10.1016/j.fuel.2014.10.046 ↗
12. Surface fractal analysis of pore structure of high-volume fly-ash cement pastes10.1016/j.apsusc.2010.07.061 ↗
13. Morphological characterization of super fine pulverized coal particle. Part 4. Nitrogen adsorption and small angle x-ray scattering study10.1021/ef100142t ↗
14. Fractality of porous silicas: a comparison of adsorption and porosimetry data10.1006/jcis.1996.0511 ↗
15. Analytical derivation of Brookse Corey type capillary pressure models using fractal geometry and evaluation of rock heterogeneity10.1016/j.petrol.2010.05.002 ↗
16. Characteristics of coal matrix compressibility: An investigation by mercury intrusion porosimetry10.1021/ef5004123 ↗
17. The dynamics of capillary flow10.1103/physrev.17.273 ↗
18. Relationship of porosity and permeability to various parameters derived from mercury injection capillary pressure curves for sandstones
19. Characterization of pore structure in cement-based materials using pressurization–depressurization cycling mercury intrusion porosimetry (PDC-MIP)10.1016/j.cemconres.2010.02.011 ↗
20. Fractal characteristics of shales from a shale gas reservoir in the Sichuan Basin, China10.1016/j.fuel.2013.07.040 ↗
21. Fractal analysis in pore structure of coal under condition of CO2 sequestration process
22. Fractal characterization of pore system evolution in cementitious materials10.1007/s12205-013-0320-2 ↗
23. Textural characterization of coals using fractal analysis10.1016/s0378-3820(03)00004-3 ↗