Multi-field coupling mechanism of CO<sub>2</sub>injection in underground gas storage under porosity-permeability evolution

Guo Xiao; Wang Zuohao; Wang Pengkun; Chen Zuwei; Wang Haodong

doi:10.7623/syxb202606007

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Multi-field coupling mechanism of CO₂injection in underground gas storage under porosity-permeability evolution

更新时间：2026-07-10

- Multi-field coupling mechanism of CO₂injection in underground gas storage under porosity-permeability evolution
- ACTA PETROLEI SINICA Vol. 47, Issue 6, Pages: 1217-1233(2026)
- 作者机构：
  
  1. 西南石油大学,四川,成都,610500
  2. 油气藏地质及开发工程全国重点实验室,四川,成都,610500
  3. 昆仑数智科技有限责任公司,四川,成都,610000
- 作者简介：
- 基金信息：
- DOI：10.7623/syxb202606007
  CLC： TE357.7
- Online First：02 July 2026，
  
  Published：2026
- 稿件说明：
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郭肖, 王作豪, 王鹏鲲, 陈祖伟, 王皓东. 考虑孔-渗演化机制的储气库注CO

Guo Xiao, Wang Zuohao, Wang Pengkun, et al. Multi-field coupling mechanism of CO₂injection in underground gas storage under porosity-permeability evolution[J]. ACTA PETROLEI SINICA, 2026, 47(6): 1217-1233. DOI: 10.7623/syxb202606007.
郭肖, 王作豪, 王鹏鲲, 陈祖伟, 王皓东. 考虑孔-渗演化机制的储气库注CO DOI： 10.7623/syxb202606007.

Guo Xiao, Wang Zuohao, Wang Pengkun, et al. Multi-field coupling mechanism of CO₂injection in underground gas storage under porosity-permeability evolution[J]. ACTA PETROLEI SINICA, 2026, 47(6): 1217-1233. DOI: 10.7623/syxb202606007. DOI：

摘要

储气库工程作为中国能源调控与资源战略布局的重要组成部分

若能以CO

作为垫底气

则可兼顾经济效益

助力实现双碳目标

具有广阔的应用前景。然而

在CO

注入过程中伴随着渗流、传热与岩石骨架应变等多重效应

其机理复杂。目前

国内外多数研究偏重于渗流场分析

较少考虑分子扩散、热传导和骨架形变对储层孔-渗结构和流体流动行为的综合影响。为深入揭示渗流场、热力学场与应力场的耦合机理及孔-渗演化特征

结合分子模拟结果

建立了考虑扩散的热-流-固耦合数学模型

开展了有限元数值模拟。研究结果表明:①在超临界CO

注入过程中

对流、重力分异与分子扩散协同控制着CO

的整体驱替。宏观运移由压力梯度驱动的对流主导

分子扩散显著拓宽了驱替前缘并形成有限混溶过渡带

重力分异则使得CO

优先沿储层底部运移;②当低温CO

注入后

通过热传导和对流换热机制与孔隙内的天然气及围岩发生热交换

致使井周温降最大可达9 K

提高注入温度可优化储层的温度分布;③孔隙压力与热应力协同作用导致岩石的有效应力降低

孔隙度和渗透率的最大增幅分别为1.6 % 、4.8 %; 4储层的初始孔隙度对其孔-渗演化的影响最显著

渗透率次之

注入温度影响最小;⑤合理的注采配置有助于CO

注入并优化储气库的垫气效率

当采用注气量为40×10

/d、产气量为17.7×10

/d的多轮次周期注采策略时

储层中CO

的垫气效率可达55.48 % 。研究成果为储气库的合理建设与安全高效运行提供了理论支持与技术参考。

Abstract

As an integral component of China’s energy regulation and strategic resource allocation

underground gas storage (UGS) engineering offers significant potential for application. Utilizing

as a cushion gas can simultaneously enhance economic viability and contribute to the realization of "dual carbon" goals. However

the CO

injection process involves intricate mechanisms characterized by the synergistic effects of seepage

heat transfer

and rock matrix strain. Currently

the majority of domestic and international research prioritizes seepage field analysis

with insufficient attention paid to the coupled impacts of molecular diffusion

thermal conduction

and matrix deformation on reservoir porosity-permeability structures and fluid flow behavior. To further elucidate the coupling mechanisms between the seepage

thermodynamic

and stress fields

as well as the porosity-permeability evolution characteristics

this study establishes a diffusion-inclusive thermo-hydro-mechanical (THM) coupled mathematical model integrated with molecular simulation results and performs finite element numerical simulations. The research results indicate as follows. (1) During the injection of supercritical CO

the overall displacement process is synergistically governed by convection

gravitational segregation

and molecular diffusion. Macroscopic transport is dominated by pressure gradient-driven convection

whereas molecular diffusion significantly broadens the displacement front and facilitates the formation of a finite miscible transition zone; concurrently

gravitational segregation causes CO

to migrate preferentially along the bottom of reservoir. (2) Upon the injection of low-temperature CO

heat exchange occurs with the interstitial natural gas and the surrounding host rock via thermal conduction and convective heat transfer mechanisms

resulting in a maximum temperature decrease of 9 K in the near-wellbore region. Increasing the injection temperature can effectively optimize the thermal distribution in reservoirs. (3) The synergistic effects of pore pressure and thermal stress lead to a reduction in the effective stress of the rock

resulting in m

aximum increments of 1.6 % and 4.8 % in porosity and permeability

respectively. (4) The initial reservoir porosity exerts the most significant influence on porosity-permeability evolution

followed by initial permeability

while injection temperature has the least impact. (5) Rational injection-production configurations facilitate CO

sequestration and optimize the cushion gas efficiency of the storage facility; specifically

under a multi-cycle periodic strategy with an injection rate of 40×10

/d and a production rate of 17.7×10

the CO

cushion gas efficiency reaches 55.48 % . These findings provide theoretical support and technical references for the rational construction and safe

efficient operation of un derground gas storage facilities.

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Multi-field coupling mechanism of CO2injection in underground gas storage under porosity-permeability evolution

DOI：10.7623/syxb202606007

摘要

Abstract

关键词

Keywords

references

Multi-field coupling mechanism of CO₂injection in underground gas storage under porosity-permeability evolution