Simulation experiment on the changes of CO<sub>2</sub> burial process in deep coal seam

ZHANG Kun; SANG Shuxun; LIU Changjiang

doi:10.3969/j.issn.1001-1986.2018.05.004

Volume 46 Issue 5

Oct. 2018

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COAL GEOLOGY & EXPLORATION > 2018 > 46(5): 26-31. > DOI: 10.3969/j.issn.1001-1986.2018.05.004

ZHANG Kun, SANG Shuxun, LIU Changjiang. Simulation experiment on the changes of CO₂ burial process in deep coal seam[J]. COAL GEOLOGY & EXPLORATION, 2018, 46(5): 26-31. DOI: 10.3969/j.issn.1001-1986.2018.05.004

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Simulation experiment on the changes of CO₂ burial process in deep coal seam

1. Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou 221116, China;
2. School of Resources and Earth Science, China University of Mining and Technology, Xuzhou 221116, China;
3. School of Geosciences, China University of Petroleum(Huadong), Qingdao 266580, China

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National Natural Science Foundation of China(41330638)

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Received Date: May 11, 2018
Published Date: October 24, 2018

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Abstract

The injection of carbon dioxide(CO₂)will change the pore fissure structure of coal seam, which has important influence on improving the capacity of CO₂ burial and enhancing methane extraction. In order to explore the evolution law of coal structure after CO₂ injection, the Sihe anthracite and Xinyuan coking-lean coal in Qinshui basin were chosen to do the simulation experiment, through the test and analysis of the coal volume parameter before and after CO₂ treatment, the following conclusions were obtained:CO₂ injection can dissolve minerals in coal, which increases the volume of connected pores and causes the expansion of organic matter; the contribution of mineral dissolution to pore volume changes is not significant, while it leads to the conversion of a large number of closed pores into interconnected pores; the maximum volume increase of pore diameter is larger than 40 μm; the expansion of organic matter is comparatively large and its squeezing effect on pores may reduce the connectivity of coal; the effect of CO₂ injection on coal structure is influenced by coal ranks and simulated burial depth.
- CO₂ geologic storage,
- coal volume,
- mineral dissolution,
- coal matrix expansion

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Simulation experiment on the changes of CO₂ burial process in deep coal seam

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