Pore structure characterization of shales using synchrotron SAXS and NMR cryoporometry

Zhao, Yixin; Peng, Lei; Liu, Shimin; Cao, Bao; Sun, Yingfeng; Hou, Bofeng

doi:10.1016/j.marpetgeo.2018.12.041

Cited by 69 publications

(28 citation statements)

References 48 publications

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“…Small-angle scattering (SAS) is an effective method to obtain quantitative information of pore structure and fractal characteristics. The pores detected by SAS include open pores and closed pores [14][15][16][17][18][19][20][21][22]. In addition, the internal structure information and external structure information of the complex system can be distinguished by using contrast variation small-angle scattering method (CV-SAS) [23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Internal Pores of LLM‐105 with Different Particle Sizes Using Contrast Variation Small Angle X‐Ray Scattering

Xing

Dong

Yao

et al. 2022

Propellants Explo Pyrotec

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To study the effect of particle size on the internal pore structure of micro/nano energetic materials, three kinds of micro/nano explosives 2,6‐diamino‐3,5‐dinitropyrazine‐1‐oxide (LLM‐105) with different particle sizes were selected as the research objects. The internal pore structure information, including porosity, pore volume distribution and fractal characteristics of micro/nano LLM‐105 were characterized by contrast variation small‐angle X‐ray scattering (CV‐SAXS). The scattering results show that the power‐law index of three samples with different particle sizes is between 3 and 4 in the measured q range (the surface fractal dimension Ds of 200 nm LLM‐105 is 2.16, Ds of 500 nm LLM‐105 is 2.20, and Ds of 3 μm LLM‐105 is 2.76). With the decrease of particle size, the interface between the internal pores and matrix becomes smooth. The pore volume per unit mass of LLM‐105 increases with the decrease of the particle size. The increase of pore volume per unit mass when the particle size decreases from 3 μm to 500 nm is much larger than that when the particle size decreases from 500 nm to 200 nm. The number of 2.5 nm–40 nm internal pores in LLM‐105 increases with the decrease of particle size. Especially for the pores of 11 nm, the number of pores increases most obviously with the decrease of particle size.

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Section: Introductionmentioning

confidence: 99%

Characterization of the Internal Pores of LLM‐105 with Different Particle Sizes Using Contrast Variation Small Angle X‐Ray Scattering

Xing

Dong

Yao

et al. 2022

Propellants Explo Pyrotec

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“…The importance of the pore structure in shale is well-understood in shale gas and oil exploration and production. , The pore structure in shale includes porosity, specific surface area, pore size distribution, pore shape, pore accessibility, and pore anisotropy. It has been frequently studied by fluid invasion methods (gas adsorption/desorption and mercury injection capillary pressure), imaging techniques (focused ion beam polishing coupled with scanning electron microscopy, transmission electron microscopy, and helium ion microscopy), nuclear magnetic resonance (NMR) cryoporometry, etc. , Figure introduces common techniques for determination of porosity, pore size distribution, and their respective pore size ranges. As shown in Figure , small-angle neutron scattering (SANS) and ultrasmall-angle neutron scattering (USANS) cover a wide size range from 1 nm to 10 μm.…”

Section: Introductionmentioning

confidence: 99%

Technical Aspects of the Pore Structure in Shale Measured by Small-Angle and Ultrasmall-Angle Neutron Scattering: A Mini Review

Zhang

Cheng

2021

Energy Fuels

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Small-angle neutron scattering (SANS) and ultrasmall-angle neutron scattering (USANS) are special and powerful tools to study micro-, meso-, and macropores from 1 nm to 10 μm in size in disordered systems. Neutron scattering measurements are often integrated with fluid-invasion methods to provide a comprehensive understanding of the pore space in shale. The first SANS study of shale samples was dated back to the early 1980s. The interest was renewed around 2011, and the number of studies that applied SANS/USANS spectra to shale has increased rapidly during the past few years. Several key developments in data analysis were noted in literature studies. In this mini review, technical aspects of sample preparation and data analysis were discussed. This paper offers a quick guide for those who are new to this field.

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“…Using synchrotron radiation as X-ray can not only greatly improve the efficiency but also do much in in situ research. Small-angle X-ray scattering (SAXS) is widely used to analyze the structure of materials and determine the size, shape, and distribution of ultrafine holes in solid materials with a particle size below dozens of nanometers. − Zhao et al discussed the influence of coal rank and vitrinite content on the coal pore structure using SAXS . Luo et al used fractal dimensions in describing the characteristics of the pore structure and concluded that the surface fractal dimensions decreased with the increase of coal ranks …”

Section: Introductionmentioning

confidence: 99%

Pore Distribution and Variation Rules of the Coal Sample with CO₂ Adsorption at Different Pressures Based on Small-Angle X-ray Scattering

et al. 2021

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Micropores play an important role in gas adsorption and migration. To reveal the variation rule of coal structural parameters in nanosize at different CO2 adsorption pressures, a CO2 adsorption in situ small-angle X-ray scattering test is performed in this work. The results show that the adsorption at different pressures somewhat influences the pore diameter distribution. The nanopores (2.13–33.86 nm) inside the coal samples shrink at low pressures (from 0.5 to 1.0 MPa) and swell at higher pressures (1.5 and 2.0 MPa). Regardless of shrinkage or swelling, the deformation increases with the decrease of the pore size. D s of the samples depends upon the capillary force. The variation of D s during 600 min (each adsorption pressure adsorbed 120 min) at five different pressures is divided into three stages. For these lower metamorphism samples (V daf lower than 55%), the micropores are abundant and distributed unevenly, which also leads to relatively high heterogeneity on the pore surface. The variation trend of the pore size distribution with time under different adsorption pressures is correlated with the variation of D s to some extent. This work enables us to better understand the variation of the pore size and surface fractal dimension during the process of adsorption in multi-points of pressure.

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Pore structure characterization of shales using synchrotron SAXS and NMR cryoporometry

Cited by 69 publications

References 48 publications

Characterization of the Internal Pores of LLM‐105 with Different Particle Sizes Using Contrast Variation Small Angle X‐Ray Scattering

Characterization of the Internal Pores of LLM‐105 with Different Particle Sizes Using Contrast Variation Small Angle X‐Ray Scattering

Technical Aspects of the Pore Structure in Shale Measured by Small-Angle and Ultrasmall-Angle Neutron Scattering: A Mini Review

Pore Distribution and Variation Rules of the Coal Sample with CO₂ Adsorption at Different Pressures Based on Small-Angle X-ray Scattering

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Pore structure characterization of shales using synchrotron SAXS and NMR cryoporometry

Cited by 69 publications

References 48 publications

Characterization of the Internal Pores of LLM‐105 with Different Particle Sizes Using Contrast Variation Small Angle X‐Ray Scattering

Characterization of the Internal Pores of LLM‐105 with Different Particle Sizes Using Contrast Variation Small Angle X‐Ray Scattering

Technical Aspects of the Pore Structure in Shale Measured by Small-Angle and Ultrasmall-Angle Neutron Scattering: A Mini Review

Pore Distribution and Variation Rules of the Coal Sample with CO2 Adsorption at Different Pressures Based on Small-Angle X-ray Scattering

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Pore Distribution and Variation Rules of the Coal Sample with CO₂ Adsorption at Different Pressures Based on Small-Angle X-ray Scattering