DOI: 10.1016/j.jcou.2018.09.016
Scopus记录号: 2-s2.0-85054401886
论文题名: Influences of subcritical and supercritical CO2 treatment on the pore structure characteristics of marine and terrestrial shales
作者: Pan Y. ; Hui D. ; Luo P. ; Zhang Y. ; Zhang L. ; Sun L.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2018
卷: 28 起始页码: 152
结束页码: 167
语种: 英语
英文关键词: Fractal dimension
; Geological sequestration
; Pore structure
; Shale
; Sub- and supercritical CO2
Scopus关键词: Fractal dimension
; Gas adsorption
; Geology
; Pore size
; Pore structure
; Shale
; Carbon dioxide adsorption
; Experimental evidence
; Extraction mechanisms
; Geochemical reactors
; Geological sequestration
; High pressure mercury
; Structure characteristic
; Supercritical CO2
; Carbon dioxide
英文摘要: To better understand and implement the CO2 sequestration project, it is of significance to investigate the interaction of shales with CO2 and its potential effects on the pore morphology. In this study, two marine shale samples and two terrestrial shale samples were prepared and treated with subcritical CO2 (30 °C and 5 MPa) and supercritical CO2 (80 °C and 20 MPa) in a geochemical reactor. Various methods, including low-pressure carbon dioxide adsorption (LP-CO2A), low-pressure nitrogen adsorption (LP-N2A), high-pressure mercury intrusion porosimetry (HP-MIP) and fractal theory, were used to gain insights into the changes in the shale pore structure after 14 days of CO2 saturation. According to the results, the phase states of CO2 obviously affected the variations of pore structure parameters during the physical and chemical reactions in shales. Interactions of supercritical CO2 with shales created a more obvious effect on the pore structure compared to those of subcritical CO2, which was attributed to the greater dissolution and expansion effect as well as the extraction mechanism associated with supercritical CO2. After exposing the shale samples to subcritical CO2, the pore size distributions (PSDs) of the treated shale samples were lower than those of the raw samples at all diameter scales, indicating that the number of pores decreased due to the reactions. Furthermore, it was found that after supercritical CO2 treatment, the micropore and mesopore structure parameters of the marine shale samples obviously decreased with an increase in macropore structure parameters, leading to the reduction in fractal dimensions in smaller pores, while the terrestrial shale samples appeared to represent a contrary trend. These findings will provide experimental evidence for further assessment of the mechanisms for CO2 geological sequestration with enhanced shale gas recovery. © 2018 Elsevier Ltd. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111751
Appears in Collections: 气候减缓与适应
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作者单位: State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan, 610500, China; Northwest Sichuan Mining District, Southwest Oil and Gas Field Company, PetroChina, Jiangyou, Sichuan, 621700, China
Recommended Citation:
Pan Y.,Hui D.,Luo P.,et al. Influences of subcritical and supercritical CO2 treatment on the pore structure characteristics of marine and terrestrial shales[J]. Journal of CO2 Utilization,2018-01-01,28