Effects of nano-pore system characteristics on CH4 adsorption capacity in anthracite

Chang’an SHAN, Tingshan ZHANG, Xing LIANG, Dongchu SHU, Zhao ZHANG, Xiangfeng WEI, Kun ZHANG, Xuliang FENG, Haihua ZHU, Shengtao WANG, Yue CHEN

PDF(2460 KB)
PDF(2460 KB)
Front. Earth Sci. ›› 2019, Vol. 13 ›› Issue (1) : 75-91. DOI: 10.1007/s11707-018-0712-1
RESEARCH ARTICLE
RESEARCH ARTICLE

Effects of nano-pore system characteristics on CH4 adsorption capacity in anthracite

Author information +
History +

Abstract

This study aims to determine the effects of nanoscale pores system characteristics on CH4 adsorption capacity in anthracite. A total of 24 coal samples from the southern Sichuan Basin, China, were examined systemically using coal maceral analysis, vitrinite reflectance tests, proximate analysis, ultimate analysis, low-temperature N2 adsorption–desorption experiments, nuclear magnetic resonance (NMR) analysis, and CH4 isotherm adsorption experiments. Results show that nano-pores are divided into four types on the basis of pore size ranges: super micropores (<4 nm), micropores (4–10 nm), mesopores (10–100 nm), and macropores (>100 nm). Super micropores, micropores, and mesopores make up the bulk of coal porosity, providing extremely large adsorption space with large internal surface area. This leads us to the conclusion that the threshold of pore diameter between adsorption pores and seepage pores is 100 nm. The “ink bottle” pores have the largest CH4 adsorption capacity, followed by semi-opened pores, whereas opened pores have the smallest CH4 adsorption capacity which indicates that anthracite pores with more irregular shapes possess higher CH4 adsorption capacity. CH4 adsorption capacity increased with the increase in NMR porosity and the bound water saturation. Moreover, CH4 adsorption capacity is positively correlated with NMR permeability when NMR permeability is less than 8×103 md. By contrast, the two factors are negatively correlated when NMR permeability is greater than 8×103 md.

Keywords

CH4 adsorption capacity / anthracite / nano-pore structure / NMR physical properties

Cite this article

Download citation ▾
Chang’an SHAN, Tingshan ZHANG, Xing LIANG, Dongchu SHU, Zhao ZHANG, Xiangfeng WEI, Kun ZHANG, Xuliang FENG, Haihua ZHU, Shengtao WANG, Yue CHEN. Effects of nano-pore system characteristics on CH4 adsorption capacity in anthracite. Front. Earth Sci., 2019, 13(1): 75‒91 https://doi.org/10.1007/s11707-018-0712-1

References

[1]
Ayers W B Jr (2002). Coalbed gas systems, resources, and production and a review of contrasting cases from the San Juan and Powder River basins. AAPG Bull, 86(11): 1853–1890
[2]
Barrett E P, Joyner L G, Halenda P P (1951). The determination of pore volume and area distributions in porous substances. I. Computations from nitrogen isotherms. J Am Chem Soc, 73(1): 373–380
CrossRef Google scholar
[3]
Brunauer S, Emmett P H, Teller E (1938). Adsorption of gases in multimolecular layers. J Am Chem Soc, 60(2): 309–319
CrossRef Google scholar
[4]
Cai Y D, Liu D M, Pan Z J, Yao Y B, Li J Q, Qiu Y K (2013). Pore structure and its impact on CH4 adsorption capacity and flow capability of bituminous and subbituminous coals from Northeast China. Fuel, 103: 258–268
CrossRef Google scholar
[5]
Chen P, Tang X Y (2001). The research on the adsorption of nitrogen in low-temperature and micro-pore properties in coal. Journal of China Coal Society, 26: 552–556 (in Chinese)
[6]
Coates G R, Xiao L Z, Prammer M G (1999). NMR Logging Principles and Applications. Houston: Gulf Publishing Company
[7]
Cuerda-Correa E M, Díaz-Díez M A, Macías-García A, Gañán-Gómez J (2006). Determination of the fractal dimension of activated carbons: two alternative methods. Appl Surf Sci, 252(17): 6102–6105
CrossRef Google scholar
[8]
De Boer J H (1958). The shape of capillaries. In: Everett D H, Stone F S, eds. The Structure and Properties of Porous Materials. London: Butterworth, 25–195
[9]
Diduszko R, Swiatkowski A, Trznadel B J (2000). On surface of micropores and fractal dimension of activated carbon determined on the basis of adsorption and SAXS investigations. Carbon, 38(8): 1153–1162
CrossRef Google scholar
[10]
Faulon J L, Mathews J P, Carlson G A, Hatcher P G (1994). Correlation between microporosity and fractal dimension of bituminous coal based on computer- generated models. Energy Fuels, 8(2): 408–414
CrossRef Google scholar
[11]
Fu X, Qin Y, Xue X (2000). Application of fractal theory on physical properties in coal reservoirs. Coal, 9(4): 1–3 (in Chinese)
[12]
Gan H, Nandi S P, Walker P L Jr (1972). Nature of porosity in American coals. Fuel, 51(4): 272–277
CrossRef Google scholar
[13]
Giffin S, Littke R, Klaver J, Urai J L (2013). Application of BIB–SEM technology to characterize macropore morphology in coal. Int J Coal Geol, 114(4): 85–95
CrossRef Google scholar
[14]
Gray I (1987). Reservoir engineering in coal seams: part 1—The physical process of gas storage and movement in coal seams. SPE (Society of Petroleum Engineers) Reservoir Evaluation & Engineering, 2(1): 28–34
[15]
Gürdal G, Yalçın M (2001). Pore volume and surface area of the Carboniferous coals from the Zonguldak basin (NW Turkey) and their variations with rank and maceral composition. Int J Coal Geol, 48(1–2): 133–144
CrossRef Google scholar
[16]
Hao Q (1987). On morphological character and origin of micropores in coal. Journal of China Coal Society, 4: 51–54 (in Chinese)
[17]
Hodgkins M A, Howard J J (1999). Application of NMR logging to reservoir characterization of low-resistivity sands in the Gulf of Mexico. AAPG Bull, 83(1): 114–127
[18]
Hodot B B (1966). Outburst of Coal and Coalbed Gas (Chinese Translation). Beijing: China Industry Press
[19]
ICS (International Commission on Stratigraphy) (2017). International Chronostratigraphic Chart (v 2017/02)
[20]
Karacan C O, Okandan E (2001). Adsorption and gas transport in coal microstructure: investigation and evaluation by quantitative X-ray CT imaging. Fuel, 80(4): 509–520
CrossRef Google scholar
[21]
Kenyon W E (1992). Nuclear magnetic resonance as a petrophysical measurement. International Journal of Radiation Applications and Instrumentation. Part E. Nuclear Geophysics, 6: 153–171
[22]
Mahamud M, López Ó, Pis J J, Pajares J A (2004). Textural characterization of chars using fractal analysis. Fuel Process Technol, 86(2): 135–149
CrossRef Google scholar
[23]
Mahnke M, Mögel H J (2003). Fractal analysis of physical adsorption on material surfaces. Colloids Surf A Physicochem Eng Asp, 216(1‒3): 215–228
CrossRef Google scholar
[24]
Mitropoulos A C, Stefanopoulos K L, Kanellopoulos N K (1998). Coal studies by small angle X-ray scattering. Microporous Mesoporous Mater, 24(1‒3): 29–39
CrossRef Google scholar
[25]
Nakagawa T, Komaki I, Sakawa M, Nishikawa K (2000). Small angle X-ray scattering study on change of fractal property of Witbank coal with heat treatment. Fuel, 79(11): 1341–1346
CrossRef Google scholar
[26]
Pan J N, Lv M M, Bai H L, Hou Q L, Li M, Wang Z Z (2017). Effects of metamorphism and deformation on the coal macromolecular structure by laser raman spectroscopy. Energy Fuels, 31(2): 1136–1146
CrossRef Google scholar
[27]
Pan J N, Niu Q H, Wang K, Shi X H, Li M (2016). The closed pores of tectonically deformed coal studied by small-angle X-ray scattering and liquid nitrogen adsorption. Microporous Mesoporous Mater, 224: 245–252
CrossRef Google scholar
[28]
Pan J N, Zhao Y Q, Hou Q L, Jin Y (2015a). Nanoscale pores in coal related to coal rank and deformation structures. Transp Porous Media, 107(2): 543–554
CrossRef Google scholar
[29]
Pan J N, Zhu H T, Hou Q L, Wang H C, Wang S (2015b). Macromolecular and pore structures of Chinese tectonically deformed coal studied by atomic force microscopy. Fuel, 139: 94–101
CrossRef Google scholar
[30]
Radlinski A P, Mastalerz M, Hinde A L, Hainbuchner M, Rauch H, Baron M, Lin J S, Fan L, Thiyagarajan P (2004). Application of SAXS and SANS in evaluation of porosity, pore size distribution and surface area of coal. Int J Coal Geol, 59(3‒4): 245–271
CrossRef Google scholar
[31]
Radovic L R, Menon V C, Leon Y , Leon C A, Kyotani T, Danner R P, Anderson S, Hatcher P G (1997). On the porous structure of coals: evidence for an interconnected but constricted micropore system and implications for coalbed methane recovery. Adsorption, 3(3): 221–232
CrossRef Google scholar
[32]
Rigby S P (2005). Predicting surface diffusivities of molecules from equilibrium adsorption isotherms. Colloids Surf A Physicochem Eng Asp, 262(1‒3): 139–149
CrossRef Google scholar
[33]
Sastry P U, Sen D, Mazumder S, Chandrasekaran K S (2000). Structural variations in lignite coal: a small angle X-ray scattering investigation. Solid State Commun, 114(6): 329–333
CrossRef Google scholar
[34]
Shan C A, Zhang T S, Guo J J, Zhang Z, Yang Y (2015). Characterization of the micropore systems in high-rank coal reservoirs of the southern Sichuan Basin, China. AAPG Bull, 99(11): 2099–2119
CrossRef Google scholar
[35]
Shi J Q, Durucan S (2005). Gas storage and flow in coalbed reservoirs: implementation of a bidisperse pore model for gas diffusion in a coal matrix. SPE Reservoir Eval Eng, 8(02): 169–175
CrossRef Google scholar
[36]
Sing K S W (1982). Reporting physisorption data for gas/solid systems with special reference to the determination of surface area and porosity. Pure Appl Chem, 54(4): 2201–2218
CrossRef Google scholar
[37]
Yao Y B, Liu D M (2006). Pore system characteristics of coal reservoirs and their influence on recovering of coalbed methane in Henan coalfields. Coal Science and Technology, 34: 64–68 (in Chinese)
[38]
Yao Y B, Liu D M, Huang W H, Tang D Z, Tang S H (2006). Research on the pore-fractures system properties of coalbed methane reservoirs and recovery in Huainan and Huaibei coal-fields. Journal of China Coal Society, 3: 163–168 (in Chinese)
[39]
Yao Y B, Liu D M, Tang D Z, Tang S H, Huang W H (2008). Fractal characterization of adsorption pores of coals from North China: an investigation on the CH4 adsorption capacity of coal. Int J Coal Geol, 73(1): 27–42
CrossRef Google scholar
[40]
Yao Y B, Liu D M, Tang D Z, Tang S H, Huang W H, Liu Z H, Che Y (2009). Fractal characterization of seepage-pores of coals from China: an investigation on permeability of coals. Comput Geosci, 35(6): 1159–1166
CrossRef Google scholar

Acknowledgements

This research was funded by the Open Foundation of Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences) (No. TPR-2016-04), the Open Foundation of Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Mineral, (Shandong University of Science and Technology) (No. DMSM2017031), the Youth Science and Technology Innovation Fund Project (Xi’an Shiyou University) (No. 290088259), the National Science and Technology Major Project (No. 2017ZX05039001-002), the National Natural Science Foundation of China (Grant Nos. 41702127 and 41772150), the Scientific Research Program Funded by Shaanxi Provincial Education Department (No. 17JK0617).

RIGHTS & PERMISSIONS

2018 Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature
AI Summary AI Mindmap
PDF(2460 KB)

Accesses

Citations

Detail

Sections
Recommended

/