Microfractal characteristics of acidified coal under different temperature and adsorption pressure conditions DOI

S.-H. Chen,

Fuchao Tian,

Yun Lei

et al.

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(5)

Published: May 1, 2025

With the increasing mining depth and ground temperature, to study changes in microstructure of acidified coal under high-temperature conditions, isothermal adsorption experiments, low-temperature nitrogen scanning electron microscopy experiments were used pore–fracture structure evolution mechanism different pressures temperatures investigate fractal characteristics by using Frenkel–Halsey–Hill model theory establish a pore calculation model. The revealed that number open pores inkwell after acidification treatment increased, connectivity increased. percentage micropores total volume specific surface area dimension D1 on samples roughness capacity Under high-pressure state gas (CH4) content inhibition oxidation reduction temperature thermal damage sample research results explored microscopic provided theoretical basis for reducing risk spontaneous combustion goaf improving permeability seams.

Language: Английский

Fractal Characterization of a Multi-Scale Pore Structure in Ultra-Deep Coal Seams DOI Creative Commons
Yanwei Qu, Feng Chen, Lulu Ma

et al.

Fractal and Fractional, Journal Year: 2025, Volume and Issue: 9(4), P. 250 - 250

Published: April 15, 2025

The pore–fracture structure of ultra-deep coal is critical for evaluating resource potential and guiding the exploration development deep coalbed methane (CBM). In this study, a sample was obtained from Gaogu-4 well at depth 4369.4 m in Shengli Oilfield Shandong, China. A comprehensive suite characterization techniques, including Field Emission Scanning Electron Microscopy (FE-SEM), X-ray diffraction (XRD), Mercury Intrusion Porosimetry (MIP), Low-temperature Nitrogen Adsorption (LT-N2GA), Low-pressure CO2 (LP-CO2GA), were employed to investigate surface morphology, mineral composition, multi-scale characteristics coal. Based on fractal geometry theory, four dimension models established, pore parameters then used calculate dimensions sample. results show that relatively rough, with prominent fractures limited presence as observed under FE-SEM. Energy Dispersive Spectrometer (EDS) analysis identified elements such C, O, Al, Si, S, Fe, thus suggesting contains silicate iron sulfide minerals. XRD shows kaolinite, marcasite, clinochlore. indicate predominantly composed micropores, followed by mesopores. Macropores are least abundant, yet they contribute most volume (PV), accounting 70.9%. specific area (SSA) micropores occupies an absolute advantage, up 97.46%. model, 1.4372, while mesopores, macropores 2.5424, 2.5917, 2.5038, respectively. These morphology distribution non-uniform exhibit statistical characteristics. dominated seams provides numerous adsorption sites CBM, thereby controlling capacity CBM.

Language: Английский

Citations

1
Improved characterization of the pore size distribution in full and across scale by a fractal strategy DOI
Huan Liu, Gaofeng Liu, Zhen Zhang

et al.

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(4)

Published: April 1, 2025

In this study, the normalized fractal dimension (DN) model of full-scale pore size was established based on classical scaling relationship porous materials. The methodology described in detail, and rationality examined by between volume specific surface area (SSA). results indicate that is a continuous function full scale, which can more comprehensively symbolize characteristic distribution scale. addition, quantitatively characterize absolute compared with traditional segmented relatively characterization methods include method connecting data SSA, dimensions. also be employed to across scales. Therefore, proposed strategy achieves breakthrough for improving materials, provides scientific basis understanding fluid transport behavior materials designing coal-based

Language: Английский

Citations

0
Deep Coalbed Methane Production Potential Based on Isothermal Adsorption Curves in the Ordos Basin of China DOI

Yuanhao Zhi,

Shuling Tang, Shida Chen

et al.

Energy & Fuels, Journal Year: 2025, Volume and Issue: unknown

Published: April 8, 2025

Language: Английский

Citations

0
A new model for determining the effective permeability of tight reservoirs based on Fractal-Monte Carlo method DOI Creative Commons
You Zhou, Songtao Wu,

Rukai Zhu

et al.

Petroleum Science, Journal Year: 2025, Volume and Issue: unknown

Published: April 1, 2025

Language: Английский

Citations

0
Microfractal characteristics of acidified coal under different temperature and adsorption pressure conditions DOI

S.-H. Chen,

Fuchao Tian,

Yun Lei

et al.

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(5)

Published: May 1, 2025

With the increasing mining depth and ground temperature, to study changes in microstructure of acidified coal under high-temperature conditions, isothermal adsorption experiments, low-temperature nitrogen scanning electron microscopy experiments were used pore–fracture structure evolution mechanism different pressures temperatures investigate fractal characteristics by using Frenkel–Halsey–Hill model theory establish a pore calculation model. The revealed that number open pores inkwell after acidification treatment increased, connectivity increased. percentage micropores total volume specific surface area dimension D1 on samples roughness capacity Under high-pressure state gas (CH4) content inhibition oxidation reduction temperature thermal damage sample research results explored microscopic provided theoretical basis for reducing risk spontaneous combustion goaf improving permeability seams.

Language: Английский

Citations

0