Fractal disposition, porosity characterization and relationships to thermal maturity for the Lower Permian Raniganj basin shales, India

Hazra, Bodhisatwa; Wood, David A.; Kumar, Sumit; Saha, Sujan; Dutta, Suryendu; Kumari, Priya; Singh, Anurag

doi:10.1016/j.jngse.2018.09.014

Cited by 38 publications

(25 citation statements)

References 73 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Zhang [31] studied the influence of electric breakdown energy on the microstructure, and the fractal dimensions of coal block was studied by means of NMR. Hazraa [32] discussed the relationships between pore structure, fractal dimension and material thermal maturity of India shale by systematic analysis.…”

Section: Introductionmentioning

confidence: 99%

Research on Strength Prediction Model of Sand-like Material Based on Nuclear Magnetic Resonance and Fractal Theory

Deng

Tian

et al. 2020

Applied Sciences

View full text Add to dashboard Cite

Micro-pore structure has a decisive effect on the physical and mechanical properties of porous materials. To further improve the composition of rock-like materials, the internal relationship between microscopic characteristics (porosity, pore size distribution) and macroscopic mechanical properties of materials needs to be studied. This study selects portland cement, quartz sand, silica fume, and water-reducing agent as raw materials to simulate sandstone. Based on the Nuclear magnetic resonance (NMR) theory and fractal theory, the study explores the internal relationship between pore structure and mechanical properties of sandstone-like materials, building a compressive strength prediction model by adopting the proportion of macropores and the dimension of macropore pore size as dependent variables. Test results show that internal pores of the material are mainly macropores, and micropores account for the least. The aperture fractal dimension, the correlation coefficient of mesopores and macropores are quite different from those of micropores. Fractal characteristics of mesopores and macropores are obvious. The macropore pore volume ratio has a good linear correlation with fractal dimension and strength, and it has a higher correlation coefficient with pore volume ratio, pore fractal dimension and other variable factors. The compressive strength increases with the growth of pore size fractal dimension, but decreases with the growth of macropore pore volume ratio. The strength prediction model has a high correlation coefficient, credibility and prediction accuracy, and the predicted strength is basically close to the measured strength.

show abstract

Section: Introductionmentioning

confidence: 99%

Research on Strength Prediction Model of Sand-like Material Based on Nuclear Magnetic Resonance and Fractal Theory

Deng

Tian

et al. 2020

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…Many researchers have studied the variation of macroscopic rock properties after high-temperature heat treatment and achieved some progress. Regarding the pore structure, various experimental techniques, including CT scanning electron microscope (CT-SEM) [15], mercury intrusion porosimetry (MIP) [16][17][18][19][20], micro-CT [21,22], field emission scanning electron microscopy (FE-SEM) [23,24], low-field nuclear magnetic resonance (NMR) [25], photoacoustic spectrometry (PAS) [26], ultrasonic velocity measurement (UVM) [27], etc., were used to study the high-temperature effects on the porosity, pore size, and pore morphology of various materials such as calcareous sediments [21], coal [15,25], concrete [16], shale [22][23][24], granite [28,29], sandstone [18,19,28], limestone [17,20], and carbonate [27]. Almost all of the above studies have shown that thermal damage and microcracks are induced by high temperature and the rock porosity and permeability gradually increase with temperature, while the pore fractal dimension decreases.…”

Section: Introductionmentioning

confidence: 99%

Mineral Composition, Pore Structure, and Mechanical Characteristics of Pyroxene Granite Exposed to Heat Treatments

et al. 2019

View full text Add to dashboard Cite

In deep geoengineering, including geothermal development, deep mining, and nuclear waste geological disposal, high temperature significantly affects the mineral properties of rocks, thereby changing their porous and mechanical characteristics. This paper experimentally studied the changes in mineral composition, pore structure, and mechanical characteristics of pyroxene granite heated to high temperature (from 25 °C to 1200 °C). The results concluded that (1) the high-temperature effect can be roughly identified as three stages: 25–500 °C, 500–800 °C, 800–1200 °C. (2) Below 500 °C, the maximum diffracted intensities of the essential minerals are comparatively stable and the porous and mechanical characteristics of granite samples change slightly, mainly due to mineral dehydration and uncoordinated thermal expansion; additionally, the failure mechanism of granite is brittle. (3) In 500–800 °C, the diffraction angles of the minerals become wider, pyroxene and quartz undergo phase transitions, and the difference in thermal expansion among minerals reaches a peak; the rock porosity increases rapidly by 1.95 times, and the newly created pores caused by high heat treatment are mainly medium ones with radii between 1 μm and 10 μm; the P-wave velocity and the elastic modulus decrease by 62.5% and 34.6%, respectively, and the peak strain increases greatly by 105.7%, indicating the failure mode changes from brittle to quasi-brittle. (4) In 800–1200 °C, illite and quartz react chemically to produce mullite and the crystal state of the minerals deteriorate dramatically; the porous and mechanical parameters of granite samples all change significantly and the P-wave, the uniaxial compressive strength (UCS), and the elastic modulus decrease by 81.30%, 81.20%, and 92.52%, while the rock porosity and the shear-slip strain increase by 4.10 times and 11.37 times, respectively; the failure mechanism of granite samples transforms from quasi-brittle to plastic, which also was confirmed with scanning electron microscopy (SEM).

show abstract

“…Traditionally, fractal dimension has been considered to be independent of the magnitude of the pores and believed to respond only to the roughness of the pore surfaces (Mahamud and Novo, 2008;Sakhee-Pour and Li, 2016). However, correlations have been observed between fractal dimension and key physical properties of certain organic-rich shales (e.g., TOC, Tmax, micro-pore surface area and volume) (Hazra et al, 2018;Liu et al, 2021). These findings suggest that the 154 Wood, D. A.…”

Section: Introductionmentioning

confidence: 99%

“…The interpretation of gas-adsorption isotherms provides a means to estimate fractal dimension values (Sahouli et al, 1996). The techniques are now widely applied to petroleumrich shales (Clarkson et al, 2013;Yang et al, 2014;Wood and Hazra, 2017;Hazra et al, 2018;Liu et al, 2021;Tian et al, 2021), and the influence of a shale's thermal maturity on fractal dimension recognised (Hazra et al, 2018;Gao et al, 2020). Shale fractal dimension values published have been derived almost exclusively based on the interpretation of low-pressure gas adsorption isotherms exploiting the Frenkel-Halsey-Hill (FHH) model (Halsey, 1948;Hill, 1952;Greggs and Sing, 1982).…”

Section: Introductionmentioning

confidence: 99%

Techniques used to calculate shale fractal dimensions involve uncertainties and imprecisions that require more careful consideration

Wood

2021

Adv. Geo-Energy Res.

Self Cite

View full text Add to dashboard Cite

show abstract

Fractal disposition, porosity characterization and relationships to thermal maturity for the Lower Permian Raniganj basin shales, India

Cited by 38 publications

References 73 publications

Research on Strength Prediction Model of Sand-like Material Based on Nuclear Magnetic Resonance and Fractal Theory

Research on Strength Prediction Model of Sand-like Material Based on Nuclear Magnetic Resonance and Fractal Theory

Mineral Composition, Pore Structure, and Mechanical Characteristics of Pyroxene Granite Exposed to Heat Treatments

Techniques used to calculate shale fractal dimensions involve uncertainties and imprecisions that require more careful consideration

Contact Info

Product

Resources

About