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Effect of CO2 on coal P-wave velocity under triaxial stress

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As P-wave velocity is sensitive to the variations in coal reservoir parameters,it is possible to monitor the injected CO2 through P-wave velocity during CO2 sequestration in coal.However,the effects of CO2 on the coal P-wave velocity under triaxial stress are not clearly discerned.In the present study,different bound-ary conditions and gases were utilised to investigate the factors affecting the P-wave velocity after the interaction of coal with CO2.Experiments with helium indicated that the pore pressure primarily affected the P-wave velocity by altering the effective stress.Experiments with CH4 and CO2 indicated that matrix swelling induced-cleats porosity decline significantly promoted P-wave velocity.Moreover,CO2 caused a wider scale and severe weakening of coal matrix than CH4,thereby significantly decreasing the P-wave velocity,and the decline in P-wave velocity increases with vitrinite content.Furthermore,experiments under different boundary conditions showed that with the boundary condition having more constraints,the decrement of pore pressure on P-wave velocity is more weaken,whereas the improvement of matrix swelling on P-wave velocity is more evident.This study contributes to understanding the mechanism of effect of CO2 on P-wave velocity under triaxial stress condition and provides guidance for monitoring CO2 sequestration in coal.

CO2 sequestration monitoringP-wave velocityCoalTriaxial stress condition

Shuangjiang Zhu、Jianhong Kang、Youpai Wang、Fubao Zhou

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Jiangsu Key Laboratory of Fire Safety in Urban Underground Space,China University of Mining and Technology,Xuzhou 221116,China

School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China

State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology,Xuzhou 221116,China

National Natural Science Foun-dation of ChinaNatural Science Foundation of Hebei Province2nd Xplorer Prize spon-sored by the Tencent FoundationProgram for Changjiang Scholars and Innovative Research Team in UniversityQinglan Project of Jiangsu Province

51974304E2020402075IRT 17R103

2022

矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDCSCDSCIEI
影响因子：1.222
ISSN：2095-2686
年,卷(期)：2022.32(1)
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