Wei Jiang’s research while affiliated with Suzhou Vocational University and other places

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Publications (3)


Pore Structure and Its Fractal Dimension: A Case Study of the Marine Shales of the Niutitang Formation in Northwest Hunan, South China
  • Article
  • Full-text available

January 2025

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5 Reads

Fractal and Fractional

Wei Jiang

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Yang Zhang

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Tianran Ma

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[...]

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Dingxiang Zhuang

To analyze the pore structure and fractal characteristics of marine shale in the lower Cambrian Niutitang Formation in northwestern Hunan Province, China, the pore characteristics of shale were characterized using total organic carbon (TOC) content, field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), low temperature nitrogen adsorption (LT-N2GA) and methane adsorption experiments. The pore surface and pore space fractal dimensions of samples were calculated, respectively. The influencing factors of fractal dimensions and their impact on the adsorption of shale reservoirs were discussed. The results indicate the Niutitang Formation shale mainly develops four types of pores: organic pores, intragranular pores, intergranular pores and microcracks. The pores have a large specific surface area (SSA), primarily consisting of mesopores. The fractal dimensions are calculated using the FHH model and the XS model. The fractal dimensions (D2 and Df) are greater than D1, indicating that the pore surface with larger pore size is rougher, and the pore structure of shale is complex. The pore volume (PV), SSA, and TOC show positive correlations with the fractal dimensions but negative correlations with APS. There is no obvious correlation between fractal dimensions and quartz content, while clay minerals show a negative correlation with D2 and Df. This is mainly because clay mineral particles are small in size and have weak resistance to compaction. The pyrite content is positively correlated with the fractal dimensions because pyrite promotes the development of organic, intergranular, and mold pores. According to Pearson correlation analysis, the main influencing factors of the pore surface fractal dimension are PV, SSA, and APS. The main influencing factors of the pore space fractal dimension are APS and the content of clay minerals. Further analysis of the influence of the fractal dimension on the adsorption capacity of shale reveals that the fractal dimensions are positively correlated with Langmuir volume, indicating that fractal dimensions can be used as a quantitative target for evaluating shale gas reservoirs.

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Comparative study on thermal decomposition of stromatolite and micrite using the technique of TG and DSC

March 2023

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18 Reads

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1 Citation

Journal of Thermal Analysis and Calorimetry

Previous studies on the characteristics of stromatolite and micrite have carried out a lot of work, but there was less research in thermochemical characteristics. Here, X-ray Diffraction (XRD) and Fourier-Transform Infrared Spectroscopy were used to determine the mineral composition and organic components of stromatolite and micrite. In addition, TG and DTG were used to analyze their thermochemical characteristics and the non-isothermal decomposition of stromatolite and micrite at multi-heating rates of 5, 10, 20 and 30 K min−1 in nitrogen atmospheres. Moreover, kinetic model function, kinetic parameters of apparent activation energy (E), and pre-exponential factor (A) were calculated by Popescu, Flynn–Wall–Ozawa and Kissinger–Akahira–Sunose. The results of XRD showed that the full width at half maximum (FWHM) of 104 crystal plane of calcite was different although the mineral composition of stromatolite and micrite was calcite. The FWHM value of stromatolites was less than that of micrite, which indicated that the crystallinity of stromatolite was higher. Furthermore, the results of TG analysis showed that the final mass loss of stromatolite was less than that of micrite. Moreover, DTG results showed that the maximum temperature point of mass loss of stromatolite was higher than that of micrite. The average value of E of stromatolite calculated by three different methods was about 252.2 kJ mol−1 but was about 208.2 kJ mol−1 for micrite. Hence, the thermal analysis results showed that the crystallinity of stromatolite were relatively higher. These results provided an important reference for analyzing the thermochemical characteristics of different Lingbi stones, especially stromatolite as a typical microbialite.

Citations (1)


... It can be seen that the TG curves of calcium carbonate under a N2 atmosphere and a 70% (N2) + 30% (O2) atmosphere basically overlapped from the beginning to the end of the pyrolysis process at the same heating rate, indicating that the addition of O2 in the reaction atmosphere had almost no effect on the TG curve of calcium carbonate. As the heating rate increased, the hysteresis of heat transferred from the gas flow to the calcium carbonate becomes greater, resulting in the movement of both the initial temperature of the reaction and the termination temperature of decomposition towards higher temperature regions [24,25]. Additionally, Figure 3a-d indicate that the peak values of the temperature were 560 C, 587 C, 723 C, and 811 C at multiple heating rates of 10, 20, 30, and 40 °C/min, thereby corresponding to the final mass loss of 58%, 55%, 45%, and 42%, respectively. ...

Reference:

Thermal Decomposition of Calcium Carbonate at Multiple Heating Rates in Different Atmospheres Using the Techniques of TG, DTG, and DSC
Differences in thermal decomposition and crystallinity of dark organic laminae and light mineral laminae in same stromatolite
  • Citing Article
  • August 2023

Thermochimica Acta