Pore morphology in thermally-treated shales and its implication on CO2 storage applications: A gas sorption, SEM, and small-angle scattering study

Chandra, Debanjan; Bakshi, Tuli; Bahadur, Jitendra; Hazra, Bodhisatwa; Vishal, Vikram; Kumar, Shubham; Sen, Debasis; Singh, T. N.

doi:10.1016/j.fuel.2022.125877

Cited by 42 publications

(19 citation statements)

References 119 publications

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“…This suggests that the higher the organic matter content of the immature shale at high temperatures, the greater the pore space and gas pressure generated by organic matter cracking, and thus, the greater the change in pore volume and specific surface area. Before 400 °C, the pore volume of the three samples from high to low is the low-TOC sample, medium-TOC sample, and high-TOC sample; this is because before 400 °C, organic matter cracking will form asphaltene, and asphaltene will block part of the pores, , and at 500 °C, because the secondary cracking of asphaltene will produce a large amount of oil and gas, the blocked pores are dredged; , hence, the pore volume of the three samples from high to low is the high-TOC sample, medium-TOC sample, low-TOC sample.…”

Section: Resultsmentioning

confidence: 99%

High-Temperature-Induced Pore System Evolution of Immature Shale with Different Total Organic Carbon Contents

et al. 2023

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The pyrolysis process of source rock, especially organic-rich immature shale, is required for oil and gas extraction, during which the evolution of the pore structure system in the immature shale determines the heat conduction and fluid flow under the heating treatment. Although some sound achievements have been made regarding the pyrolysis of immature shale, the effect of the total organic carbon (TOC) content on the pore structure evolution of immature shale remains unclear. With respect to this issue, in this work, a series of N 2 adsorption/desorption and nuclear magnetic resonance (NMR) experiments were conducted, and fractal dimension theory was also introduced to analyze the pore structure evolution of immature shale subjected to heating treatment in a quantitative manner. The results indicate that the adsorption branch of the nitrogen adsorption–desorption isotherm can be divided into three stages. The pore structure of different TOC immature shales does not change significantly, and they are all slit-shaped. In addition, immature shale with a higher organic content has a higher hydrocarbon expulsion strength and a higher pore volume growth rate, which indicate that the pyrolysis of organic matter greatly affects the pore structure of immature shale during heating. This phenomenon shows that the pyrolysis of organic matter greatly influences the pore structure of immature shale during the heating process. The pores of immature shale in the study area have significant fractal characteristics, the fractal dimension is between 2.397 and 2.636, the pore space of the sample is extremely small, the pore structure is extremely complex, and the heterogeneity is strong.

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Section: Resultsmentioning

confidence: 99%

High-Temperature-Induced Pore System Evolution of Immature Shale with Different Total Organic Carbon Contents

et al. 2023

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“…In recent times, advanced instrumentation facilities have provided detailed insights into the nanoscale pores. High-resolution imaging, i.e., scanning electron microscopy (SEM), plays a vital role in the both qualitative and quantitative characterizations of structural characteristics and pore morphology. − Intrusive methods like low-pressure gas adsorption (LPGA) provide the quantitative characterization of gas accessible pore systems including surface area, pore volume, and pore size distribution (PSD). − Also, indirect methods like small angle X-ray scattering (SAXS) can provide pore attributes for both accessible and inaccessible pores. − Numerous investigations revealed divergent capacities of different types of organic content to produce hydrocarbons. Based on hydrogen index (HI) and oxygen index (OI) produced from Rock-Eval pyrolysis, kerogens in hydrocarbon source rocks can be roughly divided into four basic categories, , which indicates the potential of the source rock.…”

Section: Introductionmentioning

confidence: 99%

Systematic Pore Characterization of Sub-Bituminous Coal from Sohagpur Coalfield, Central India Using Gas Adsorption Coupled with X-ray Scattering and High-Resolution Imaging

Bhapkar,

Pradhan,

Chandra

et al. 2023

Energy Fuels

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Pore characterization helps to estimate the coalbed methane recovery and carbon storage potential of the reservoir. Earlier research on the characteristics of coal pores has shown that coal has high hydrocarbon storage potential in the adsorbed state, but few studies have shown the influence of chemical heterogeneities and depth on the adsorption potential of the coal. With the objective of studying the effect of chemical variation, depth, and surface roughness on gas adsorption potential, this study combines coal composition analysis and adsorption-based pore characterization of coal and shale samples coupled with high-resolution imaging and X-ray scattering measurements. Variation in pore features is correlated with varying depth and composition. A decrease in the mesopore volume and surface area is observed with an increase in the depth and total organic content and inverse behavior is observed for micropores. Scanning electron microscopy images depict the change in the pore shape from semi-spherical OM pores to elongated pores with depth, and samples with high mineral content show a dominance of inter- and intraparticle pores. Fractal dimension values estimated from SAXS are notably higher than N2-LPGA-derived values (i.e.,D S > D N ) due to the incorporation of inaccessible pores, which reflects an increase of up to 62% in SAXS estimated mesopore volume and surface area. This study will provide a better approach to understand the impact of composition, depth, and surface roughness over the gas storage potential in coal reservoirs.

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“…Research on fractal theory by using HPMI tests is deepening. Those results showed that the fractal dimension is an important parameter to quantitatively characterize pore structure heterogeneity, which has important significance in dividing the pore-throat system, calculating porosity and permeability, and evaluating seepage performance. ,− Lai et al showed that fractal dimensions of small pores can be used to evaluate micropore complexities. Guo et al found that micropores (0.1–0.2 μm) are the main factor restricting the permeability of tight sandstone reservoirs by using an empirical equation with fractal dimensions and different pore-throat radius.…”

Section: Introductionmentioning

confidence: 99%

Single- and Multifractal Dimension Variation of the Pore-Fracture System in Tight Sandstone by Using High-Pressure Mercury Intrusive Tests and Its Influence on Porosity–Permeability Variation

Han¹,

Shan²,

Xu³

et al. 2023

Energy Fuels

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Micro-structures of the pore-fracture size distribution of target sandstone samples are studied through high-pressure mercury intrusion (HPMI) experiments, and the compressibility coefficient is quantitatively described by using overlying pressure porosity−permeability tests. Then, four single and multifractal models were used to quantitatively describe the fractal characteristics of mercury intrusion curves, and the relationship between different fractal models and pore structure parameters is analyzed. Furthermore, the applicability of fractal models in characterizing pore-fracture structures was explored. The results are as follows: (1) fractal model results show that fractal dimensions of type A by using Sierpinski (D S ) and thermodynamics models (D M ) are larger than those of type B, and fractal dimensions of type A by using Menger (D M ) and multifractal models (D −10 −D 10 ) are smaller than those of type B. (2) The Menger model is used to describe heterogeneity of smaller pore size distribution, which is proportional to volume percentage of pores with the diameter smaller than 100 nm; the thermodynamic model is used to describe heterogeneity of medium pore size distribution, which is proportional to the volume percentage of pores with a diameter of 100∼1000 nm; The Sierpinski model is used to describe heterogeneity of larger pore size distribution, which is proportional to volume percentage of pores with the diameter larger than 1000 nm; (3) permeability decreases in the form of power function with the increase of confining pressure, and the compressibility coefficient and permeability variation coefficient decrease with the increase of the compressibility coefficient. There is no significant correlation between the compressibility coefficient, permeability variation coefficient, and pore structure parameters.

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Pore morphology in thermally-treated shales and its implication on CO2 storage applications: A gas sorption, SEM, and small-angle scattering study

Cited by 42 publications

References 119 publications

High-Temperature-Induced Pore System Evolution of Immature Shale with Different Total Organic Carbon Contents

High-Temperature-Induced Pore System Evolution of Immature Shale with Different Total Organic Carbon Contents

Systematic Pore Characterization of Sub-Bituminous Coal from Sohagpur Coalfield, Central India Using Gas Adsorption Coupled with X-ray Scattering and High-Resolution Imaging

Single- and Multifractal Dimension Variation of the Pore-Fracture System in Tight Sandstone by Using High-Pressure Mercury Intrusive Tests and Its Influence on Porosity–Permeability Variation

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