Quantitative Analysis of Pore Structure and Its Impact on Methane Adsorption Capacity of Coal

Xu, Shipei; Hu, Erfeng; Li, Xingchun; Yu, Xu

doi:10.1007/s11053-020-09723-2

Cited by 22 publications

(11 citation statements)

References 46 publications

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“…where ρ is the T 2 surface intensity (μm/ms), S is the pore surface area (μm 2 ), and V is the volume (μm 3 ).…”

Section: Resultsmentioning

confidence: 99%

“…Considering the fast growth of natural gas consumption needs, the shrinking in conventional gas reservoirs, and the progress in resource exploration and development technology, unconventional natural gas reservoirs have gradually become a research hotspot in recent years. 1 Unconventional natural gas resources, e.g., shale gas, 2 tight sandstone gas, and coalbed methane, 3 have huge reserves, which has become an important development target at present. 4 Unconventional reservoir rocks are characterized by low porosity (<10%) and permeability (<0.1 mD), small porethroat diameter (<1 μm), 5 complex pore-throat structures, poor pore-throat connectivity, and strong heterogeneity.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization of the Pore Structure and Fluid Movability of Coal-Measure Sedimentary Rocks by Nuclear Magnetic Resonance (NMR)

et al. 2021

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Analyzing and mastering the pore structure and fluid movability characteristics of coal-measure sedimentary rocks is significant for the safe and effective development of unconventional resources. In this work, nuclear magnetic resonance (NMR) experiments were carried out on three common fine sedimentary rocks (i.e., shale, mudstone, and sandstone) from a coal-measure stratum in northern China. NMR transverse (T 2) of the water-saturated and centrifuged rock samples are compared and analyzed. Moreover, the pore size distribution (PSD) and the free-fluid volume index (FFI) of the investigated samples are discussed. Results have shown that the shale and mudstone samples are mainly dominated by adsorption pores with a diameter of 0.01–1 μm, while the sandstone samples are dominated by seepage pores with a diameter of 1–100 μm. The FFI results calculated by the cutoff and the area methods are 11.15–77.62 and 7.56–75.96%, respectively. There are good correlations between FFI and porosity, permeability, and reservoir quality index (RQI). Also, the effects on FFI are different on various kinds of clay minerals. The contents of illite and chlorite are negatively correlated with FFI, while kaolinite is positively correlated with FFI.

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“…where ρ is the T 2 surface intensity (μm/ms), S is the pore surface area (μm 2 ), and V is the volume (μm 3 ).…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization of the Pore Structure and Fluid Movability of Coal-Measure Sedimentary Rocks by Nuclear Magnetic Resonance (NMR)

et al. 2021

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“…Then, based on the isothermal adsorption line of N 2 , the mesopore volume and area were calculated by the BJH model and the BET multilayer adsorption equation, respectively. The micropore volume and area were calculated by density functional theory (DFT). − …”

Section: Samples and Experimentalmentioning

confidence: 99%

Effects of CS₂ Solvent Extraction on Nanopores in Coal

Si,

Liu,

Lin

et al. 2023

Energy Fuels

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This study investigates the effects of the carbon disulfide (CS2) extraction on nanopores of the anthracite samples. Comprehensive pore measurement techniques, including high-pressure mercury intrusion (HPMI), low-temperature nitrogen adsorption (LTNA), and low-temperature CO2 adsorption (LTCA), were employed to analyze the variations of nanopore structure and fractal characteristics. After CS2 extraction, the macropore average diameter and volume increase, while the macropore area and fractal dimension decrease, indicating the pore-enlarged and fractal dimension-reduced effects of CS2 extraction on macropores. The pore-generated and fractal dimension-increased effects of CS2 extraction on mesopores induce reduction in the average diameter and an increase in mesopore volume, area, and fractal dimension. The pore-enlarged and fractal dimension-reduced effects of CS2 extraction on micropores cause an increase in the average diameter and reduction in micropore volume, area, and fractal dimension. These effects of CS2 extraction on nanopore structure are conducive to enhancing CBM transport. This study can provide a theoretical basis on the chemical reservoir stimulation technique with CS2 extraction.

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“…The relationship degree of the micropore structure on methane adsorption in coal is 0.91, so the micropore characteristics have an important influence on methane adsorption. 17 Qajar et al established a two-site adsorption model based on DFT. By calculating two surface energy terms, different adsorption states of methane molecules were defined, and the adsorption of methane on the coal seam and rock strata was distinguished.…”

Section: Introductionmentioning

confidence: 99%

Modeling Methane Adsorption Distance Using Carbon Nanotubes and Bituminous Coal Pore Models

Zha,

Lin,

Liu

et al. 2024

Energy Fuels

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To simplify the analysis of the adsorption of methane by coal, single-walled carbon nanotubes (SWCNTs), slit graphene lamellae, and bituminous coal pore models were constructed, and the adsorption of methane molecules in the three models was studied using molecular dynamics and density functional theory. The results show that methane molecules cannot be adsorbed within carbon nanotubes with a pore size of 0.5 nm. In carbon nanotubes with a pore size of 1 nm, adsorbed methane is influenced by the inner wall of the SWCNTs to induce dipoles and to interact with nearby methane molecules. In large-pore-size carbon nanotubes and graphene sheets, methane molecules adsorb and accumulate on the wall surface to form adsorption rings, the thickness of which gradually increases with the pore size under the effect of curvature, ranging from 0.455 to 0.521 nm. This criterion for adsorption was applied to the pore model of bituminous coal, and 52 adsorbed methane states were determined. Furthermore, the Brunauer–Emmett–Teller equation was used to fit the methane isothermal adsorption curve of the bituminous coal pore model, and the adsorption quantity of methane in a single molecular layer was 54, confirming that the adsorption criterion of 0.521 nm is reasonable.

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Quantitative Analysis of Pore Structure and Its Impact on Methane Adsorption Capacity of Coal

Cited by 22 publications

References 46 publications

Characterization of the Pore Structure and Fluid Movability of Coal-Measure Sedimentary Rocks by Nuclear Magnetic Resonance (NMR)

Characterization of the Pore Structure and Fluid Movability of Coal-Measure Sedimentary Rocks by Nuclear Magnetic Resonance (NMR)

Effects of CS₂ Solvent Extraction on Nanopores in Coal

Modeling Methane Adsorption Distance Using Carbon Nanotubes and Bituminous Coal Pore Models

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Quantitative Analysis of Pore Structure and Its Impact on Methane Adsorption Capacity of Coal

Cited by 22 publications

References 46 publications

Characterization of the Pore Structure and Fluid Movability of Coal-Measure Sedimentary Rocks by Nuclear Magnetic Resonance (NMR)

Characterization of the Pore Structure and Fluid Movability of Coal-Measure Sedimentary Rocks by Nuclear Magnetic Resonance (NMR)

Effects of CS2 Solvent Extraction on Nanopores in Coal

Modeling Methane Adsorption Distance Using Carbon Nanotubes and Bituminous Coal Pore Models

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Product

Resources

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Effects of CS₂ Solvent Extraction on Nanopores in Coal