Effect of pore size distribution on hydrocarbon mixtures adsorption in shale nanoporous media from engineering density functional theory

Wang, Yingnan; Jin, Zhehui

doi:10.1016/j.fuel.2019.115650

Cited by 21 publications

(8 citation statements)

References 40 publications

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“…For the hard-sphere term F ex rep [ρ f ( r )], the fundamental measure theory ,− (FMT) is one of the most popular methods, while the modified FMT , (MFMT), smoothed density approximation − (SDA), and weighted density approximation ,, (WDA) are also widely used. In Table , we present the detailed information on F ex rep [ρ f ( r )] used in the literatures.…”

Section: Characterization Of Pore Size Distribution and Specific Surf...mentioning

confidence: 99%

Comprehensive Review about Methane Adsorption in Shale Nanoporous Media

2021

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Shale/tight gas plays an increasingly important role to meet the growing global energy demand and reduce carbon emissions. Unlike conventional reservoirs, shale formations are subject to rock heterogeneity and have pore size distributions ranging from sub-1 nm to a few micrometers. Thanks to the large number of nanosized pores, adsorbed methane capacity plays a dominant role in total shale gas-in-place. Methane adsorption behaviors can vary drastically in micropores and mesopores, and rock surface type may also greatly affect its adsorption. In this review, we provide a systematic discussion on measurements of shale rock properties including rock compositions and pore structures such as specific surface area (SSA) and pore size distribution (PSD), which are important parameters for methane adsorption in shale nanoporous media. We also provide in-depth discussions on experimental measurements on methane (excess) adsorption in shale nanoporous media, methane adsorption behavior characterization based on molecular simulations, and various excess-adsorption-to-absolute-adsorption conversion methods. We pay particular attention to the assumptions and working mechanisms proposed in various interpretation methods which are embedded in pore structures (SSA and PSD) and absolute adsorption characterizations. In the end, we summarize the key challenges in the methane adsorption characterization in shale media.

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Section: Characterization Of Pore Size Distribution and Specific Surf...mentioning

confidence: 99%

Comprehensive Review about Methane Adsorption in Shale Nanoporous Media

2021

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“…Pore structure parameters, mainly including pore size distribution, can influence the adsorption force between the pore walls and adsorbed gas molecules (Burggraaf 1999;Chen et al 2019;Cui et al 2004;Wang and Jin 2019). Generally, the adsorption force between gas molecules and pore walls decreased with increasing pore width (Burggraaf 1999;Cui et al 2004).…”

Section: Pore Structurementioning

confidence: 99%

“…Therefore, the pore in shale is complex and heterogeneous with different pore sizes, pore origins and pore types. Some studies indicate that the pore size can influence the adsorption force between the pore walls and adsorbed gas molecules (Burggraaf 1999;Cao et al 2020;Chen et al 2019;Cui et al 2004;Qiu et al 2021;Wang and Jin 2019). Generally, the adsorption force decreased with increasing pore width (Burggraaf 1999;Cui et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Quantitative characterization of pore network and influencing factors of methane adsorption capacity of transitional shale from the southern North China Basin

Liu

Wang

et al. 2021

J Petrol Explor Prod Technol

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Quantitative characterization of pore structure and analysis of influencing factors of methane adsorption are important segments in shale gas reservoir and resources evaluation and have not been systematically carried out in marine–continental shale series. A series of integrated methods, including total organic carbon (TOC) contents, Rock-Eval pyrolysis, mineral composition analysis, pore structure measurement, high-pressure CH4 adsorption analysis and FE-SEM observation, were conducted on 12 transitional shale samples of well WBC-1 in the southern North China Basin (SNCB). The results indicate that TOC contents of the transitional shales range from 1.03 to 8.06% with an average of 2.39%. The transitional shale consists chiefly of quartz, white mica and clay minerals. Interparticle pore, intraparticle pore, dissolution pore and microfracture were observed in the FE-SEM images. The specific surface area (SSA) of BET for the samples ranges from 3.3612 to 12.1217 m2/g (average: 6.9320 m2/g), whereas the DR SSA for the samples ranges from 12.9844 to 35.4267 m2/g (average: 19.67 m2/g). The Langmuir volume (VL) ranges from 2.05 to 4.75 cm3/g (average = 2.43 cm3/g). There is unobvious correction between BET and DR SSA with TOC contents, which means inorganic pores are the main component of pore space in the transitional shale from the SNCB. The relationship of SSA and pore volume shows that micropore has a greater impact on the CH4 adsorption capacity than mesopore–macropore in the transitional shale. Different from shales in other petroliferous basin, clay minerals are the primary factor affecting adsorption capacity of CH4 for transitional shale in this study. The pore structure of the transitional shale for this study is characterized by higher fractal dimension and more heterogeneous pore structure compared to shale in other petroliferous basin. This study provides an example and new revelation for the influencing factors of pore structure and methane adsorption capacity of marine–continental transitional shale.

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“…Properties of interest for us are pores/pore throats and grain shape and size, and connectivity and length scale associated with them. These features are all of importance in the context of fluid flow in the system. , Additionally, topological features at various length scales are useful when studying multiscale structures or even removing segmentation errors …”

Section: Introductionmentioning

confidence: 99%

“…These features are all of importance in the context of fluid flow in the system. 7,8 Additionally, topological features at various length scales are useful when studying multiscale structures or even removing segmentation errors. 9 Topological data analysis (TDA), in particular persistent homology (PH), is a method that has recently become a major tool for quantifying different aspects of porous systems.…”

Section: ■ Introductionmentioning

confidence: 99%

Pore Characterization of Organic-Rich Shales through Application of Topological Data Analysis and Persistent Homology

Bizhani

Ardakani

2021

Energy Fuels

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This paper discusses pore characterization of organic-rich shales using 3D high-resolution imaging and a topological data analysis (TDA) framework. In particular, our focus is on persistent homology. Our data set contains four organic-rich shale samples (imaged at 10 nm3/voxel) and a Bentheimer sandstone as the anchor point for comparison. The analysis shows that pores larger than 12.4 nm have poor connectivity, and there is no evidence of a percolating path through any of the shale samples. In contrast, the Bentheimer sandstone shows remarkable differences from the shales in terms of pore connectivity. In terms of geometry, pores and grains in shale are shown to be highly nonconvex, while sandstone exhibits a more uniform and convex distribution of pore and grain size. Euler characteristics of the samples are also computed and discussed along with the pore network extracted on the segmented images. The results show all three methods have an agreement in the overall description of the pore space. However, persistent homology data reveal more information on the pore and grain phase as compared to the other methods. In the last section of the paper, we present an investigation of topological changes in the pore space as a function of pore radius. The analysis indicates most pores must be enlarged by ∼70–80 nm for the pore space to span into a connected network. The implication is that flow mainly occurs through independent channels in shales, as opposed to sandstone where many redundant flow pathways exist.

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Effect of pore size distribution on hydrocarbon mixtures adsorption in shale nanoporous media from engineering density functional theory

Cited by 21 publications

References 40 publications

Comprehensive Review about Methane Adsorption in Shale Nanoporous Media

Comprehensive Review about Methane Adsorption in Shale Nanoporous Media

Quantitative characterization of pore network and influencing factors of methane adsorption capacity of transitional shale from the southern North China Basin

Pore Characterization of Organic-Rich Shales through Application of Topological Data Analysis and Persistent Homology

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