考虑围压约束的深煤岩峰前‒峰后能量脆性综合评价方法

时贤; 张博涛; 蒋恕; 琚宜文; 翟成; 陈峥嵘; 杨江浩

doi:10.3799/dqkx.2025.213

Volume 51 Issue 7

Jul. 2026

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Article Navigation > Earth Science > 2026 > 51(7): 2596-2611

Shi Xian, Zhang Botao, Jiang Shu, Ju Yiwen, Zhai Cheng, Chen Zhengrong, Yang Jianghao, 2026. A Comprehensive Brittleness Evaluation Method for Deep Coal Reservoirs Based on Pre- and Post-Peak Energy Characteristics under Confining Pressure Constraints. Earth Science, 51(7): 2596-2611. doi: 10.3799/dqkx.2025.213

Citation:

Shi Xian, Zhang Botao, Jiang Shu, Ju Yiwen, Zhai Cheng, Chen Zhengrong, Yang Jianghao, 2026. A Comprehensive Brittleness Evaluation Method for Deep Coal Reservoirs Based on Pre- and Post-Peak Energy Characteristics under Confining Pressure Constraints. Earth Science, 51(7): 2596-2611. doi: 10.3799/dqkx.2025.213

Citation:

Shi Xian, Zhang Botao, Jiang Shu, Ju Yiwen, Zhai Cheng, Chen Zhengrong, Yang Jianghao, 2026. A Comprehensive Brittleness Evaluation Method for Deep Coal Reservoirs Based on Pre- and Post-Peak Energy Characteristics under Confining Pressure Constraints. Earth Science, 51(7): 2596-2611. doi: 10.3799/dqkx.2025.213

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A Comprehensive Brittleness Evaluation Method for Deep Coal Reservoirs Based on Pre- and Post-Peak Energy Characteristics under Confining Pressure Constraints

doi: 10.3799/dqkx.2025.213

Shi Xian^{1, 2
,
,},
Zhang Botao^{1, 2},
Jiang Shu³,
Ju Yiwen⁴,
Zhai Cheng⁵,
Chen Zhengrong⁶,
Yang Jianghao⁷

1.
State Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, China
2.
School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
3.
Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences (Wuhan), Wuhan 430074, China
4.
College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
5.
College of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
6.
CNOOC Research Institute Co. Ltd., Beijing 100028, China
7.
Ener Tech-Drilling and Production Co. Ltd., CNOOC, Tianjin 300452, China

Received Date: 2025-08-14
Publish Date: 2026-07-25

Abstract

Abstract

The accuracy of brittleness evaluation critically influences the effectiveness of hydraulic fracturing in deep coal reservoirs; however, conventional methods, largely developed for shale, are inadequate for coal rocks owing to their complex cleat systems and pronounced sensitivity to confining pressure. To address this, triaxial compression tests were conducted to obtain the stress-strain curves of coal rocks. A damage variable was introduced to quantify the nonlinear impact of pre-peak crack evolution on energy distribution, formulating a dual-parameter pre-peak brittleness index, B_pre, based on damage and energy. Incorporating the dynamic constraint effect of confining pressure, a post-peak brittleness index, B_post, was established by coupling the stress drop rate with confining pressure. Subsequently, a comprehensive coal brittleness index, B_coal, was derived by employing the harmonic mean method, integrating both pre- and post-peak energy characteristics and confining pressure constraints. Experimental results demonstrate that B_coal effectively differentiates the brittleness of coal rocks across varying confining pressures, demonstrating reliable evaluation within the confining pressure range of 5 to 20 MPa, and exhibiting superior sensitivity and reliability over traditional methods. This study enhances the accuracy of coal brittleness evaluation, thereby providing crucial theoretical support for the optimization of coalbed methane fracturing strategies.
- deep coalbed methane,
- brittleness evaluation,
- pre-peak and post-peak energy characteristics,
- confining pressure effect,
- triaxial compression test

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References(56)

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A Comprehensive Brittleness Evaluation Method for Deep Coal Reservoirs Based on Pre- and Post-Peak Energy Characteristics under Confining Pressure Constraints

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