深层高温页岩统计损伤本构模型及脆性评价方法

doi:10.3799/dqkx.2026.154

深层高温页岩统计损伤本构模型及脆性评价方法

doi: 10.3799/dqkx.2026.154

1. 中国石油大学(华东）石油工程学院, 山东青岛 266580;
2. 中国地质大学(武汉）构造与油气资源教育部重点实验室, 湖北武汉 430074;
3. 中国矿业大学安全工程学院, 江苏徐州 221116;
4. 沙赫鲁德理工大学采矿石油与地球物理工程学院, 伊朗沙赫鲁德

基金项目:

国家自然科学基金项目(52374026,52374027)

山东省自然基金项目(ZR2024ME125)

国家科技重大专项(2025ZD1404101)。

详细信息

作者简介:
龚武镇(1998-),男,在读博士,从事岩土工程、井壁稳定、压裂等方面的研究,E-mail:gwz13409692063@163.com,ORCID:0009-0005-3554-8679

通讯作者:
时贤(1984-),男,教授,博士,从事多尺度岩石力学表征、地质力学建模、非常规地质工程一体化压裂设计、井壁失稳、大数据石油工程应用等方面的研究。E-mail:xianshiupc@126.com,ORCID:0000-0002-6109-0594.

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出版历程
- 收稿日期: 2025-12-27
- 网络出版日期: 2026-06-29

Statistical damage constitutive model and brittleness evaluation method for deep high-temperature shale

1. College of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China;
2. Key Laboratory of Tectonics and Petroleum Resources Ministry of Education, China University of Geosciences (Wuhan), Wuhan, Hubei 430074, China;
3. School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China;
4. Faculty of Mining, Petroleum & Geophysics Engineering, Shahrood University of Technology, Shahrood, Iran

摘要

摘要: 深层高温页岩统计损伤本构模型及脆性评价是推动深层页岩油气高效勘探开发的关键研究课题。以川南五峰组页岩为研究对象，通过XRD、SEM及高温三轴压缩实验，系统研究温度-围压耦合作用下其微观组构、力学特性、损伤演化规律及脆性特征。结合应力-应变过程引入热损伤变量，首次建立基于幂函数分布与Mogi-Coulomb准则的统计损伤本构模型，给出模型参数计算解析式，并基于损伤演化率提出一种能够描述温度-围压作用下新的脆性评价方法。结果表明：川南五峰组页岩石英平均含量为68.49%，属于典型硬脆性页岩；温度升高会诱发热裂纹并劣化力学性能；岩样峰值强度与弹性模量均与围压呈正相关性，与温度呈负相关性；围压增加，岩样复合型裂纹破坏特征逐步向以单一剪切裂纹为主的破坏模式转变，且整体倾向于剪切破坏；所提出本构模型能够较准确地模拟不同温度-围压下试样各阶段应力-应变曲线，且精准描述试样峰值强度与峰值应变；损伤演化率与围压呈负相关性，即该模型能准确刻画围压升高对试样损伤发展的抑制过程；新的脆性指数在室温和高温条件下均随围压增加而降低，且相同围压下温度升高岩石脆性指数减小，验证了该指标的合理性，研究结果丰富了岩石脆性评价方法。
- 损伤演化 /
- 本构模型 /
- 脆性 /
- 深层页岩 /
- 力学特性 /
- 高温
Abstract: The statistical damage constitutive model and brittleness evaluation for deep high-temperature shales represent key research topics for advancing efficient exploration and development of deep shale oil and gas. Taking the Wufeng Formation shales in southern Sichuan as the study subject, this research systematically investigates their microstructure, mechanical properties, damage evolution patterns, and brittleness characteristics under coupled temperature-confining pressure effects through XRD, SEM, and high-temperature triaxial compression experiments. Integrating thermal damage variables into the stress-strain process, this study establishes the first statistical damage constitutive model based on power distribution and the Mogi-Coulomb criterion. Analytical expressions for model parameters are derived, and a novel brittleness evaluation method describing damage evolution rates under temperature-confining pressure interaction is proposed. Results indicate: The average quartz content in Wufeng Formation shale from southern Sichuan is 68.49%, classifying it as typical hard brittle shale; temperature increase induces thermal cracking and degrades mechanical properties; both peak strength and elastic modulus of rock specimens show positive correlation with confining pressure and negative correlation with temperature; As confining pressure increases, the composite crack failure characteristics of rock specimens gradually shift toward a failure mode dominated by single shear cracks, with an overall tendency toward shear failure. The proposed constitutive model accurately simulates the stress-strain curves of specimens at different temperature-confining pressure stages and precisely describes the peak strength and peak strain of specimens. The damage evolution rate exhibits a negative correlation with confining pressure, indicating that the model accurately captures the suppression of specimen damage progression by increasing confining pressure. The new brittleness index decreases with increasing confining pressure at both room and elevated temperatures. Furthermore, at the same confining pressure, the brittleness index decreases with increasing temperature, validating the rationality of this indicator. These findings enrich the methods for evaluating rock brittleness.
- damage evolution /
- constitutive model /
- brittleness /
- deep shale /
- mechanical property /
- high temperature

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参考文献(60)

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深层高温页岩统计损伤本构模型及脆性评价方法

doi: 10.3799/dqkx.2026.154

作者简介:
龚武镇(1998-),男,在读博士,从事岩土工程、井壁稳定、压裂等方面的研究,E-mail:gwz13409692063@163.com,ORCID:0009-0005-3554-8679

通讯作者:
时贤(1984-),男,教授,博士,从事多尺度岩石力学表征、地质力学建模、非常规地质工程一体化压裂设计、井壁失稳、大数据石油工程应用等方面的研究。E-mail:xianshiupc@126.com,ORCID:0000-0002-6109-0594.

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Statistical damage constitutive model and brittleness evaluation method for deep high-temperature shale

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留言板

深层高温页岩统计损伤本构模型及脆性评价方法

doi: 10.3799/dqkx.2026.154

作者简介: 龚武镇(1998-),男,在读博士,从事岩土工程、井壁稳定、压裂等方面的研究,E-mail:gwz13409692063@163.com,ORCID:0009-0005-3554-8679

通讯作者: 时贤(1984-),男,教授,博士,从事多尺度岩石力学表征、地质力学建模、非常规地质工程一体化压裂设计、井壁失稳、大数据石油工程应用等方面的研究。E-mail:xianshiupc@126.com,ORCID:0000-0002-6109-0594.

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Statistical damage constitutive model and brittleness evaluation method for deep high-temperature shale

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出版历程

目录

作者简介:
龚武镇(1998-),男,在读博士,从事岩土工程、井壁稳定、压裂等方面的研究,E-mail:gwz13409692063@163.com,ORCID:0009-0005-3554-8679

通讯作者:
时贤(1984-),男,教授,博士,从事多尺度岩石力学表征、地质力学建模、非常规地质工程一体化压裂设计、井壁失稳、大数据石油工程应用等方面的研究。E-mail:xianshiupc@126.com,ORCID:0000-0002-6109-0594.