Research on CO2 transfer in basalt and sandstone using 3D pore space model generation and mathematical morphology

Zhang, Xiang; Liu, Shuming; Zeng, Lei; Jun-tong, QU

doi:10.1016/j.cageo.2022.105147

Cited by 3 publications

(1 citation statement)

References 26 publications

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“…The proposed model addresses random heterogeneity in material properties by using a Weibull random field. The author of this paper (see Zhang et al [18]) performed biphasic transformation on continuous Gaussian random fields to simulate the pore and matrix phases of rocks and then numerically predicted gas migration properties.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Research on Water Transport during Adsorption and Desorption in Cement-Based Materials

Zhang¹,

Su²,

Wang³

et al. 2023

Computer Modeling in Engineering &Amp; Sciences

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The durability of cement-based materials is related to water transport and storage in their pore network under different humidity conditions. To understand the mechanism and characteristics of water adsorption and desorption processes from the microscopic scale, this study introduces different points of view for the pore space model generation and numerical simulation of water transport by considering the "ink-bottle" effect. On the basis of the pore structure parameters (i.e., pore size distribution and porosity) of cement paste and mortar with water-binder ratios of 0.3, 0.4 and 0.5 obtained via mercury intrusion porosimetry, randomly formed 3D pore space models are generated using two-phase transformation on Gaussian random fields and verified via image analysis method of mathematical morphology. Considering the Kelvin-Laplace equation and the influence of "ink-bottle" pores, two numerical calculation scenarios based on mathematical morphology are proposed and applied to the generated model to simulate the adsorption-desorption process. The simulated adsorption and desorption curves are close to those of the experiment, verifying the effectiveness of the developed model and methods. The obtained results characterize water transport in cement-based materials during the variation of relative humidity and further explain the hysteresis effect due to "ink-bottle" pores from the microscopic scale.

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Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Research on Water Transport during Adsorption and Desorption in Cement-Based Materials

Zhang¹,

Su²,

Wang³

et al. 2023

Computer Modeling in Engineering &Amp; Sciences

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Micro-CT characterization on pore structure evolution of low-permeability sandstone under acid treatment

Liu

Zhang

et al. 2023

Applied Geochemistry

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Microstructure evolution of coal undergoing in situ demineralization and ensued impacts on seepage characteristics

Luo,

Zhang,

Hao

et al. 2024

Physics of Fluids

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The natural fracture system present in coal provides the principal channel for transporting coalbed methane. Dissolving or modifying mineral occlusions has the potential to enhance the permeability of highly mineralized coal seams. In this study, low-rank mineralized coal was examined using x-ray computed tomography (CT) scanning. A novel in situ demineralization method based on coal CT images was developed using an improved pore-scale three-dimensional morphological modeling algorithm to further investigate the effect of mineral alteration on the dynamic evolution of microstructure and seepage characteristics. The results indicate that the development of pore-fracture and the alteration of mineralogical properties affect the demineralization work. Demineralization increases the connected porosity from 4.16% to 15.42%, significantly increasing the interconnected pore space of the coal. Meanwhile, permeability improved from 0.73 to 2.15 μm2, and a 194.5% increase after the completion of the demineralization work. A higher demineralization degree can develop the preferential flow channels well, resulting in a more rapid pore pressure drop. As demineralization progresses, the flow streamline distribution becomes more homogeneous, and new flow channels emerge. The proposed method shows superior performance in poorly connected areas, with a 69.29% higher permeability compared to previous methods.

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Research on CO2 transfer in basalt and sandstone using 3D pore space model generation and mathematical morphology

Cited by 3 publications

References 26 publications

Experimental and Numerical Research on Water Transport during Adsorption and Desorption in Cement-Based Materials

Experimental and Numerical Research on Water Transport during Adsorption and Desorption in Cement-Based Materials

Micro-CT characterization on pore structure evolution of low-permeability sandstone under acid treatment

Microstructure evolution of coal undergoing in situ demineralization and ensued impacts on seepage characteristics

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