Three-dimensional pore-scale study of methane gas mass diffusion in shale with spatially heterogeneous and anisotropic features

Yin, Ying; Qu, Zhiguo; Zhang, T.; Zhang, J.F.; Wang, Qiqi

doi:10.1016/j.fuel.2020.117750

Cited by 25 publications

(19 citation statements)

References 57 publications

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“…In comparison with the mineral matrix pores (InterP and IntraP pores), it can be speculated that the OM pores have structural characteristics that ensure good connectivity, that is, the connectivity of the shale is mainly provided by the OM pores. However, limited by the observation accuracy and imaging depth of field, FIB‐SEM is unable directly characterize the connectivity of OM pores (Sun et al, 2019, 2020; R. Yang et al, 2017; Yin et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

“…The 3D reconstruction technique based on FIB‐SEM mainly uses the focused ion beam to cut the sample surface (thickness is about 2 nm), and then employs the backscattered electron signal for imaging (Yin, Qiu, Zhang, Zhang, & Wang, 2020). Repeating the above two actions of cutting and imaging, the 3D structure of the sample can be continuously imaged, and the structural information of the sample in 3D space can be obtained by the computer image processing technique.…”

Section: Methodsmentioning

confidence: 99%

“…However, limited by the observation accuracy and imaging depth of field, FIB-SEM is unable directly characterize the connectivity of OM pores (Sun et al, 2019(Sun et al, , 2020R. Yang et al, 2017;Yin et al, 2020).…”

Section: D Om Pores Structure By Fib-semmentioning

confidence: 99%

“…Shale samples viewed under HIM do not need to be sprayed with carbon and gilded to enhance their conductivity.3.2.3 | 3D reconstruction of FIB-SEMThe 3D reconstruction technique based on FIB-SEM mainly uses the focused ion beam to cut the sample surface (thickness is about 2 nm), and then employs the backscattered electron signal F I G U R E 6 3D connectivity characteristics of organic matter (OM) pores exhibited in 2D digital photographs under helium ion microscope (HIM) microscopy, and nested compound structure of OM pores under HIM microscope. (a-f): Based on the great imaging depth of field and extremely high resolution of HIM, smaller diameter OM pores develop inside larger diameter OM pores, and this nested compound pore structure greatly enhances the connectivity of the OM pores system for imaging(Yin, Qiu, Zhang, Zhang, & Wang, 2020). Repeating the above two actions of cutting and imaging, the 3D structure of the sample can be continuously imaged, and the structural information of the sample in 3D space can be obtained by the computer image processing technique.4 | RESULTS 4.1 | 2D OM pores structure 4.1.1 | 2D OM pores structure under FIB-SEM In this study, the morphology of pyrobitumen in the FIB-SEM observation field of view is classified into two categories, namely, contiguous and dispersed.…”

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Connectivity of organic matter pores in the Lower Silurian Longmaxi Formation shale, Sichuan Basin, Southern China: Analyses from helium ion microscope and focused ion beam scanning electron microscope

et al. 2022

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As one of the most important energy sources in the world today, shale gas has attracted extensive research. Numerous scholars agreed that the organic matter (OM) pores in shale provide the main space which benefits effective gas occurrence. However, the connectivity provided by OM pores is more important in the development process than their reservoir properties. A comprehensive portrayal of the 3D connectivity of the OM pores is elaborated in this study. The Lower Silurian Longmaxi shale samples were selected as the research subject.The shale samples are subjected to focused ion beam scanning electron microscope, helium ion microscope observation experiments, 2D microscopic characterization of OM pores, and 3D segmentation extraction. The results indicate that the connectivity of shale is mainly contributed by OM pores. The OM pores have the advantageous structural characteristics of large number per unit area, evenly distributed, regular pore morphology, and large pore size relative to the mineral matrix pores. The OM pores structure in shale is complex with a network structure of small pores nested in large pores, which can increase the adsorption capacity of gas. Besides, the small pores nested in large pores can act as a throat to significantly improve the connectivity. OM pores in the pyrobitumen are interconnected in 3D space, providing the main channels for gas percolation in the shale reservoir.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: D Om Pores Structure By Fib-semmentioning

confidence: 99%

mentioning

confidence: 99%

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Connectivity of organic matter pores in the Lower Silurian Longmaxi Formation shale, Sichuan Basin, Southern China: Analyses from helium ion microscope and focused ion beam scanning electron microscope

et al. 2022

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“…It is located in the deep-water shelf sedimentary zone belt of hydrostatic water and anoxic and reducing environment. Due to the large reservoir thickness, high TOC, content, large porosity, high brittle mineral content, large brittleness index, and high gas content, a set of nearly 90 m black organic-rich shale reservoirs was formed (Ye et al, 2018;Yang et al, 2020;Yin et al, 2020), as shown in Table 1, and more information about the region is shown in Supplementary Material.…”

Section: Geological Settingmentioning

confidence: 99%

Research on the Percolation Mechanism of Perturbation Under Simultaneous Fracturing in Shale Reservoirs

Niu²,

Meng³

et al. 2021

Front. Energy Res.

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Compared with conventional reservoirs, shale gas reservoirs usually have no natural productivity or lower productivity, and the rate of production decline is high in the later stage. The production of shale gas can be effectively improved by designing reasonably or fracturing. Therefore, it is critical for shale gas reservoir to study how to design proper parameters to make it effectively developed. Based on data of block-A region of the Zhejiang gas field, considering the contribution of rock compression to the production, the productivity formula of horizontal well at different seepage stages is deduced. Data from block-A are verified by orthogonal experiment, including gas reservoir parameters and engineering parameters. The results show that the order of reservoir parameters that affect the development of shale gas is as follows: Langmuir pressure, diffusion coefficient, cross flow coefficient, and Langmuir volume; the order of engineering parameters that affect the development of shale gas is as follows: number of fractures, horizontal section length, production pressure, fractures length, row spacing, and well spacing. The research results have been applied to the Zhejiang gas field. The initial rate of decline after adjustment is reduced by 26.08% and production increases by 17.06% after stabilization compared to wells without adjustment parameters. The research has important reference significance for the efficient development of similar gas reservoirs.

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Numerical simulation study on the seepage characteristics of coal seam infusion effected by mining-induced stress

Xin

Cheng

et al. 2021

Bull Eng Geol Environ

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Three-dimensional pore-scale study of methane gas mass diffusion in shale with spatially heterogeneous and anisotropic features

Cited by 25 publications

References 57 publications

Connectivity of organic matter pores in the Lower Silurian Longmaxi Formation shale, Sichuan Basin, Southern China: Analyses from helium ion microscope and focused ion beam scanning electron microscope

Connectivity of organic matter pores in the Lower Silurian Longmaxi Formation shale, Sichuan Basin, Southern China: Analyses from helium ion microscope and focused ion beam scanning electron microscope

Research on the Percolation Mechanism of Perturbation Under Simultaneous Fracturing in Shale Reservoirs

Numerical simulation study on the seepage characteristics of coal seam infusion effected by mining-induced stress

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