利用FE-SEM、HIP、N<sub>2</sub>吸附实验表征生物气化煤系有机岩储层微观孔隙结构演化

王超勇; 鲍园; 琚宜文

doi:10.3799/dqkx.2018.285

Volume 45 Issue 1

Jan. 2020

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Wang Chaoyong, Bao Yuan, Ju Yiwen, 2020. Micropore Structure Evolution of Organic Matters in Coal Measures due to Bioconversion Using FE-SEM, HIP and N2 Adsorption Experiments. Earth Science, 45(1): 251-262. doi: 10.3799/dqkx.2018.285

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Wang Chaoyong, Bao Yuan, Ju Yiwen, 2020. Micropore Structure Evolution of Organic Matters in Coal Measures due to Bioconversion Using FE-SEM, HIP and N₂ Adsorption Experiments. Earth Science, 45(1): 251-262. doi: 10.3799/dqkx.2018.285

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Micropore Structure Evolution of Organic Matters in Coal Measures due to Bioconversion Using FE-SEM, HIP and N₂ Adsorption Experiments

doi: 10.3799/dqkx.2018.285

Wang Chaoyong^{1
,
,},
Bao Yuan^{2
,
,},
Ju Yiwen³

1.
Key Laboratory of CBM Resources and Reservoir Formation Process, Ministry of Education, School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221008, China
2.
College of Geology and Environment, Xi'an University of Science and Technology, Xi'an 710054, China
3.
Key Laboratory of Computational Geodynamics of Chinese Academy of Sciences, College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2018-08-14
Publish Date: 2020-01-15

Abstract

Abstract

Micropore structure characterization of organic matters in the coal measures due to bioconversion is of great significance in understanding reservoir reformation by microorganism and revealing the storage and enrichment mechanism of biogenic gas in the coal measures. Pore structure evolution of organic matters in the coal measures degraded by microbe was analyzed using field emission scanning electron microscopy (FE-SEM), high-pressure mercury intrusion porosimetry (MIP), low-pressure N₂ gas adsorption pycnometry and fractal dimension FHH theory in this study. Considering the measuring range of pore size distribution (PSD) and combining the characteristics of microbial ecology, the pore structure type of coal and shale in coal measures is divided into three types. They are micropore (PSD>5 μm), micro-nanopore (5 μm-100 nm), and nanopore (2-100 nm). The PSD and micropore pore volume (PV) of coal and shale samples increase, and the specific surface area (SSA) and micro-nanopore and nanopore PV decrease after bioconversion. The surface fractal diameter (D₁) and pore structure fractal diameter (D₂) of coal and shale samples decrease after bioconversion, showing that the inner surface of pore becomes smooth and pore structure gets simple due to microbial action. The reformation of pore structure due to bioconversion is benefitial to the migration and enrichment of free gas in the coal measures.
- organic matters in the coal measures,
- pore structure,
- fractal dimension,
- bioconversion,
- biogenic gas,
- coal bed methane

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References(52)

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Micropore Structure Evolution of Organic Matters in Coal Measures due to Bioconversion Using FE-SEM, HIP and N2 Adsorption Experiments

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Micropore Structure Evolution of Organic Matters in Coal Measures due to Bioconversion Using FE-SEM, HIP and N₂ Adsorption Experiments