Effects of coalification on nano-micron scale pore development: From bituminous to semi-anthracite

Gao, Bin; Wu, Caifang; Song, Yu; Zhou, Dan; Han, Jiang; Jiang, Xiuming; Fang, Xiaojie; Feng, Guangjun

doi:10.1016/j.jngse.2022.104681

Cited by 6 publications

(8 citation statements)

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“…At the last stage of the adsorption process (P/P 0 > 0.9), the adsorption amount again increases rapidly with increasing relative pressure, which is mainly controlled by capillary condensation. 40,43 The overall trend of the curve in the desorption stage is similar to that in the adsorption stage. In the high-relative-pressure stage (P/P 0 > 0.9), with the decrease in the relative pressure, the adsorption amount decreased rapidly, and the desorption rate after the relative pressure P/P 0 < 0.9 decreased.…”

Section: Fe-semmentioning

confidence: 53%

“…This indicates the end of monolayer adsorption and the beginning of multimolecule adsorption. At the last stage of the adsorption process ( P / P 0 > 0.9), the adsorption amount again increases rapidly with increasing relative pressure, which is mainly controlled by capillary condensation. , …”

Section: Resultsmentioning

confidence: 97%

“…The correlation of ln P is stronger in the low-value region, which may be due to the obvious shrinkage of the matrix in the MICP, which affects the accuracy of the test results. It also shows that MICP has some deficiencies in the characterization of mesopores and micropores. , …”

Section: Resultsmentioning

confidence: 99%

“…It also shows that MICP has some deficiencies in the characterization of mesopores and micropores. 40,53 Based on the MICP, the minimum fractal dimension is 2.7598 on average (Table 6). The macropores of the lower Palaeozoic shale are complex, and the corresponding macropore heterogeneity is strong.…”

Section: Fe-semmentioning

confidence: 99%

“…The traditional methods for calculating the fractal dimension of shale include the box dimension method, the mercury intrusion method, and the Frenkel–Halsey–Hill (FHH) model test method. , The fractal dimension of the crack surface and confining pressure can be established based on a microfocus CT scanning test. The fractal dimension of the relationship between pore volume and intrusion pressure can be obtained by MICP, and the fractal dimension of pore surface area and pore structure can be determined by using LTN 2 GA and LTCO 2 GA and the FHH model. − …”

Section: Introductionmentioning

confidence: 99%

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Pore System Diversity and Control Factors of High-Overmature Shale─Taking the Lujiaping and Longmaxi Formation Shales as an Example

Liu,

Zhu,

Shang

et al. 2023

Energy Fuels

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Pore structure plays an important role in the preservation and migration of shale gas. The pore structure of shale samples from the lower Palaeozoic Lujiaping and Longmaxi Formations in northeastern Chongqing was characterized by image analysis and fluid injection, and the porosity, homogeneity, and roughness were studied by using various fractal methods. The results indicate that compared with the shale facies of the Longmaxi Formation, the Lujiaping Formation has more developed organic matter pores, smaller macropore (>50 nm) volumes, smaller macropore specific surface areas, smaller mesopore (2–50 nm) volumes, larger mesopore specific surface areas, larger micropore (<2 nm) volumes, and micropore specific surface areas. The shale samples of the Lujiaping Formation are in the stage of micrographitization, lack a rigid skeleton, and are obviously influenced by other external factors such as compaction; there is no obvious correlation between pore structure and R O, TOC (total organic carbon), and clay and quartz of the Lujiaping Formation. However, the maturity of the shale samples of the Longmaxi Formation is in the high-maturity stage, which has not yet reached the organic carbonization stage or has a low carbonization degree and is less affected by compaction. The mesopore and micropore volumes and specific surface area have obvious negative correlations with R O, TOC, and quartz minerals and positive correlations with clay minerals. In addition, compared with the Longmaxi Formation shale, the Lujiaping Formation shale has larger fractal dimensions of macropores, mesopores, and micropores, which indicates that it has stronger heterogeneity, stronger pore roughness, and more complex morphology. At the same time, the fractal dimension of mesopores and micropores has a negative correlation with R O, TOC, and quartz. The main reason for the poor prospects of shale exploitation in the Lujiaping Formation may be pore shrinkage in the micrographitization stage.

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Section: Fe-semmentioning

confidence: 53%

Section: Resultsmentioning

confidence: 97%