超临界CO2-H2O作用下不同煤阶煤体孔隙结构演化及分形特征

doi:10.13809/j.cnki.cn32-1825/te.2025.06.005

Abstract

Abstract:

Injecting CO₂ into deep coal seams to enhance coalbed methane (CBM) extraction has both environmental and economic benefits, indicating broad development prospects. To investigate the structural changes of different types of coal after CO₂ injection, five samples with different maximum vitrinite reflectance (R_{o, max}) were selected to conduct supercritical CO₂ injection experiments under conditions simulating a coal seam burial depth of 1 500 m. The pore and fracture structures of the coal samples before and after injection were characterized using low-temperature N₂ adsorption and mercury intrusion porosimetry. The extent of changes was quantitatively compared using fractal theory. The results of N₂ adsorption experiments showed that the pore volume of the coal samples before and after supercritical CO₂-H₂O reaction initially decreased and then increased with increasing coal rank. An inflection point was formed at coking coal, with the most significant increase in pore volume observed within the micropore range (pore diameter 0~2 nm). The changes in pore volume observed in mercury intrusion porosimetry experiments were relatively complex, with significant increases in the transition pore range (pore diameter>2~50 nm) and fracture range (pore diameter>1 000 nm). This was because the supercritical CO₂-H₂O reaction increased the proportion of non-effective connected pores in the coal, enhancing the local connectivity of the coal samples. Furthermore, the total pore volume of some samples even showed a decreasing trend after reaction, likely due to the blockage of pores and fractures by detached minerals. The fractal analysis results of pore parameters before and after reaction showed that the changes in pore and fracture structure depended on the characteristic coal parameters. The changes in pore volume were more pronounced in low-rank and high-rank coals after the reaction, and the extent of change was more significant in samples with higher mineral content. This study contributes to a deeper understanding of how CO₂ injection changes the pore structure of deep coal seams and can provide a reference for site selection in CO₂ geological storage and enhanced coalbed methane development (CO₂-ECBM) projects.

Key words: supercritical CO₂, CO₂-ECBM, coal rank, pore variation, fractal

CLC Number:

TE357

SONG Xuemei,ZHANG Kun,DONG Liang, et al. Evolution and fractal characteristics of pore structure in coals of different ranks under supercritical CO₂-H₂O[J]. Petroleum Reservoir Evaluation and Development, 2025, 15(6): 995-1006.

Figures/Tables 11

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样品名称	煤级	R_{o, max}/%	工业分析组分质量分数/%				矿物检测
样品名称	煤级	R_{o, max}/%	M_ad	A_ad	V_daf	F_cd	碳酸盐矿物质量分数/%	硅酸盐矿物质量分数/%
刘庄（LZ）	气-肥煤	0.93	1.25	19.6	39.34	39.91	—	95.70
杨庄（YZ）	气-肥煤	0.94	1.66	14.3	19.60	65.24	10.69	83.88
新源（XY）	焦-瘦煤	1.81	0.81	5.35	15.26	80.20	6.84	86.69
新景（XJ）	无烟煤	2.64	1.66	10.02	10.10	80.89	4.07	87.32
寺河（SH）	无烟煤	3.33	1.48	13.12	6.32	81.39	13.82	74.50

样品编号	模拟埋深/m	储层环境
样品编号	模拟埋深/m	温度/℃	压力/MPa
LZ	1 500	48.0	15
YZ	1 500	47.5	15
XY	1 500	43.0	15
XJ	1 500	50.0	15
SH	1 500	62.5	15

样品编号	反应情况	总孔隙体积/（mL/g）	有效连通孔隙体积/（mL/g）	非连通孔隙体积/（mL/g）
LZ	反应前	0.008 704	0.004 365	0.004 339
LZ	反应后	0.021 555	0.013 548	0.008 007
YZ	反应前	0.036 914	0.019 761	0.017 153
YZ	反应后	0.038 246	0.021 458	0.016 788
XY	反应前	0.038 400	0.032 100	0.006 300
XY	反应后	0.047 740	0.020 494	0.027 246
XJ	反应前	0.034 600	0.030 200	0.004 400
XJ	反应后	0.031 051	0.020 397	0.010 654
SH	反应前	0.032 500	0.029 000	0.003 500
SH	反应后	0.027 141	0.014 656	0.012 485

Evolution and fractal characteristics of pore structure in coals of different ranks under supercritical CO₂-H₂O

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Evolution and fractal characteristics of pore structure in coals of different ranks under supercritical CO2-H2O

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Evolution and fractal characteristics of pore structure in coals of different ranks under supercritical CO₂-H₂O