scholarly journals Coal Matrix Deformation and Pore Structure Change in High-Pressure Nitrogen Replacement of Methane

Energies ◽  
2018 ◽  
Vol 11 (1) ◽  
pp. 175 ◽  
Author(s):  
Xiaofeng Ji ◽  
Dangyu Song ◽  
Xiaoming Ni ◽  
Yunbo Li ◽  
Haotian Zhao
Keyword(s):  
High Pressure ◽  
Pore Structure ◽  
Structure Change ◽  
Coal Matrix ◽  
Matrix Deformation

Study into structure change of deep buried clay during triaxial high pressure unloading test by CT

2004 ◽  
pp. 487-491
Author(s):  
Zhiyong Zhang ◽  
Weili Wang ◽  
Xiaoqin Li ◽  
Ruhua Sun ◽  
Wenping Li ◽  
...  
Keyword(s):  
High Pressure ◽  
Structure Change

Study into structure change of deep buried clay during triaxial high pressure unloading test by CT

2004 ◽  
pp. 487-492
Author(s):  
Wenping Li ◽  
Xiaoqin Li ◽  
Zhiyong Zhang ◽  
Ruhua Sun ◽  
Weili Wang ◽  
...  
Keyword(s):  
High Pressure ◽  
Structure Change

Calculation and Analysis of Multifractal Spectrum of Sinter Surface

2013 ◽  
Vol 750-752 ◽  
pp. 2267-2270
Author(s):  
Zhi Min Cui ◽  
Rong Li Sang ◽  
Yuan Liang Li ◽  
Qing Jun Zhang
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Pore Structure ◽  
Multifractal Spectrum ◽  
Transmission Electron Microscopy Image ◽  
Structure Change ◽  
Electron Microscopy Image ◽  
Transmission Electron ◽  
Microscopy Image ◽  
Fractal Spectrum

Multifractal spectrums of sinter with different alkalinity were analyzed by multifractal software. The results show that sinter pore structure change from uniform to non-uniform with the improvement of alkalinity, Δα increases from 0.53 to 0.55. The structure of sinter pore is mainly microscopic by competition between macropores and micropores, Δf changes from 0.14 to-0.44. The distribution of sinter pores is quantitatively characterized by multi-fractal spectrum, which is consistent with transmission electron microscopy image.

The whole-aperture pore-structure characteristics of marine-continental transitional shale facies of the Taiyuan and Shanxi Formations in the Qinshui Basin, North China

2019 ◽  
Vol 7 (2) ◽  
pp. T547-T563 ◽  
Author(s):  
Jiyuan Wang ◽  
Shaobin Guo
Keyword(s):  
High Pressure ◽  
Specific Surface ◽  
Pore Structure ◽  
Surface Area ◽  
Specific Surface Area ◽  
Gas Adsorption ◽  
Pore Morphology ◽  
Qinshui Basin ◽  
Mercury Intrusion ◽  
Structure Characteristics

To systematically study the whole-aperture pore-structure characteristics of the marine-continental transitional shale facies in the Upper Palaeozoic Taiyuan and Shanxi Formations of the Qinshui Basin, we have collected a total of 11 samples for high-pressure mercury intrusion, low-pressure gas adsorption ([Formula: see text] and [Formula: see text]), nuclear magnetic resonance (NMR), and field-emission scanning electron microscopy with argon-ion polishing experiments to determine the pore morphology and distribution characteristics of shale samples in detail and to perform quantitative analyses. Then compared the pore-development characteristics of the Taiyuan Formation samples with those of the Shanxi Formation to determine which is preferable. The experimental results indicate that the shale samples of the Qinshui Basin mainly develop three types of pores: organic pores, intergranular pores, and microfractures. High-pressure mercury intrusion and gas-adsorption experiments indicate that the pore-size distributions exhibit multiple peaks. The samples contained varying proportions of macropores, mesopores, and micropores, among which the former two are dominant, accounting for approximately 85% of the total pore volume, whereas micropores account for only 15%. However, mesopores and micropores dominate the specific surface area; between them, the micropores are much more prevalent, accounting for more than 99% of the total specific surface area. Macropores contribute less than 1% of the specific surface area and therefore can be neglected. The pore morphology resembles the slit type parallel platy pores with a ballpoint pen structure. The NMR [Formula: see text] spectra have multiple-peak values. In addition, the large difference between the curved areas before and after centrifugation indicates that the samples contain a large proportion of mesopores and macropores, which is consistent with the results presented above. The results demonstrate that the development of pores in the Taiyuan Formation is better than that in the Shanxi Formation.

Study on pore structure evaluation of shale gas reservoir-Taking the Lower Cambrian Niutitang Formation in the Cenggong Block, Guizhou Province as an example

2020 ◽  
pp. 1-25
Author(s):  
Fuqiang Lai ◽  
Haiyan Mao ◽  
Jianping Bai ◽  
Daijan Gong ◽  
Guotong Zhang ◽  
...  
Keyword(s):  
High Pressure ◽  
Pore Structure ◽  
Structure Parameters ◽  
Pore Throat ◽  
Throat Radius ◽  
Volume Percentage ◽  
Nmr Logging ◽  
Mercury Intrusion ◽  
Niutitang Formation ◽  
Structure Evaluation

The storage and seepage space of shale is mainly composed of pores and fractures, while the microscopic pore structure and fracture distribution are very complicated. The accuracy of calculation of pore structure parameters is related to whether the reservoir evaluation is correct and effective. Taking the Niutitang Formation in the Cengong area of Guizhou as the research object. Firstly, based on the Archie formula, the process of the wellbore mud intrusion is approximated as the process of the laboratory high pressure mercury intrusion, combined with conventional and nuclear magnetic resonance logging data. The formula deduces a new model for the T2 spectrum conversion pseudo-capillary pressure curve. Then the model is calibrated by the high pressure mercury intrusion experimental data, and the pore structure parameters such as reservoir pore size distribution curve and maximum pore throat radius are calculated. The results show that the maximum pore throat radius and total porosity data calculated by NMR logging are relatively reliable, the median radius error is general, and the displacement pressure and median pressure error are relatively large. The pore volume percentage of 1-10 μm is up to 60%, and the micro-cracks are relatively developed, which is beneficial to the fracturing of the reservoir. Therefore, the use of NMR logging data combined with conventional logging can better reflect the pore structure characteristics of reservoirs, which provides a strong support for complex reservoir identification and qualitative prediction of productivity, and has a good application prospect.

scholarly journals Optimization of the Pore Structure of Biomass-Based Carbons in Relation to Their Use for CO2Capture under Low- and High-Pressure Regimes

2018 ◽  
Vol 10 (2) ◽  
pp. 1623-1633 ◽  
Author(s):  
Marta Sevilla ◽  
Abdul Salam M. Al-Jumialy ◽  
Antonio B. Fuertes ◽  
Robert Mokaya
Keyword(s):  
High Pressure ◽  
Pore Structure
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