页岩注入CO2渗透率多阶段演化特性的模型解析

doi:10.3724/1000-6915.jrme.2025.0505

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摘要精准预测CO2注入页岩储层的渗透率动态演化规律对于碳封存和增强页岩气开采具有重要意义。针对传统渗透率模型难以准确描述CO2由低压气态到超临界态全压注入页岩过程中的渗透率全过程演化问题，基于基质–裂隙双弹性介质系统，构建由组分渗透率权重决定的页岩渗透率演化模型；通过引入基质力学劣化、二次吸附，以及应变滞后效应等关键因素，建立起多效应耦合控制的渗透率演化方程。基于双弹性介质体重叠结构开展并行交叉耦合数值求解，实现对CO2全压注入过程中页岩渗透率非线性演化过程的准确描述。进一步，影响效应解耦研究结果表明：CO2对基质材料力学参数的劣化界定渗透率波动范围的边界阈值，机械应变与吸附应变之间的非同步响应显著放大演化阶段差异，形成具有显著辨识度的阶段转换过程；应变滞后效应则显著延长演化时间跨度；气体吸附作用与力学响应共同调控各演化阶段的转变节点，尤其是二次吸附引发的额外膨胀应变明显增强了演化过程中的阶段划分程度。此外，本研究还深入分析流–固耦合渗透率建模基本框架和不同数值模拟方法的特性，不仅可以加深对CO2注入过程中页岩渗透率演化过程的理解，还为流体地质封存渗透率理论建模及数值模拟方法提供借鉴意义。

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	李文睿1
	2
	3
	王登科1
	2
	3*
	魏建平1
	2
	3
	余金昊1
	2
	赵文霖1
	2
	温志辉1
	2
	3

关键词 ：岩石力学, 碳封存, 页岩, 渗透率演化, 超临界态, 二次吸附

Abstract：Accurately predicting the dynamic evolution of permeability during CO2 injection into shale reservoirs is crucial for carbon sequestration and enhanced shale gas recovery. However, traditional permeability models often fail to comprehensively describe the full-range evolution of permeability throughout the entire CO2 injection process in shale—from the low-pressure gaseous state to the supercritical state. To address this limitation, this study develops a shale permeability evolution model based on a dual-elastic system comprising both the matrix and fractures, determined by component permeability weighting. By incorporating key factors such as mechanical degradation of the matrix, secondary adsorption, and strain hysteresis effects, we establish a governing equation for permeability evolution under multi-effect coupling. Utilizing an overlapping dual-elastic medium structure, we perform parallel cross-coupling numerical solutions, achieving an accurate representation of the nonlinear permeability evolution during full-pressure CO2 injection. Furthermore, a decoupled analysis of influencing effects reveals that the degradation of mechanical parameters of the matrix material due to CO2 defines the boundary thresholds for permeability fluctuation ranges. The asynchronous response between mechanical strain and adsorption strain significantly amplifies differences across evolutionary stages, leading to clearly distinguishable phase transitions. Additionally, the strain hysteresis effect prolongs the duration of evolution. Gas adsorption and mechanical responses jointly regulate the transition points between evolutionary stages, with the secondary adsorption-induced swelling strain particularly enhancing phase differentiation throughout the evolution process. This study also provides an in-depth analysis of the fundamental framework of fluid-solid coupled permeability modeling and explores the characteristics of different numerical simulation methods. The findings not only deepen the understanding of shale permeability evolution during CO2 injection but also offer valuable insights for theoretical modeling and numerical simulation of permeability in geological fluid sequestration.

Key words： rock mechanics carbon sequestration shale permeability evolution supercritical state secondary adsorption

引用本文:

李文睿1，2，3，王登科1，2，3*，魏建平1，2，3，余金昊1，2，赵文霖1，2，温志辉1，2，3. 页岩注入CO2渗透率多阶段演化特性的模型解析[J]. 岩石力学与工程学报, 2026, 45(2): 432-448.
LI Wenrui1, 2, 3, WANG Dengke1, 2, 3*, WEI Jianping1, 2, 3, YU Jinhao1, 2, ZHAO Wenlin1, 2, WEN Zhihui1, 2, 3. Model interpretation of the multi-stage evolution characteristics of shale permeability during the injection of CO2. , 2026, 45(2): 432-448.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.3724/1000-6915.jrme.2025.0505 或 https://rockmech.whrsm.ac.cn/CN/Y2026/V45/I2/432

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