CO_(2)地质封存盖层力学完整性数值模拟研究  

Numerical Simulation Study on the Mechanical Integrity of Caprock in CO_(2)Geological Sequestration

作　　者：刘斌[1,2] 黄甜甜[1] LIU Bin;HUANG Tiantian(School of Electrical Engineering and Information,Northeast Petroleum University,Daqing Heilongjiang 163318,China;Bohai Rim Energy Research Institute,Northeast Petroleum University,Qinhuangdao Hebei 066004,China)

机构地区：[1]东北石油大学电气信息工程学院,黑龙江大庆163318 [2]东北石油大学环渤海能源研究院,河北秦皇岛066004

出　　处：《石油化工高等学校学报》2025年第1期33-41,共9页Journal of Petrochemical Universities

基　　金：国家重点研发计划项目(2022YFE0206800);黑龙江省自然科学基金联合引导项目(LH2023D004);中国石油科技创新基金项目(2021DQ02-1103)。

摘　　要：CO_(2)地质封存是缓解温室效应的重要手段之一。CO_(2)能否安全地储存在地下储层中,在很大程度上取决于盖层的力学完整性。通过建立CO_(2)地质封存流固耦合模型,研究了CO_(2)注入过程中盖层的孔隙压力、垂直位移和有效应力的变化规律,分析了CO_(2)注入速率、盖层弹性参数以及地应力因数对盖层发生拉伸破坏和剪切破坏的影响。结果表明,在CO_(2)注入初期,注入井附近盖层底部孔隙压力、垂直位移和有效应力的变化较大,随后趋于平缓;注入井附近的盖层被认为是封存系统最关键的部分,该位置发生力学破坏的风险最大;在CO_(2)注入过程中,注入速率和地应力因数对盖层发生力学破坏的影响最为显著。研究结果可为评估CO_(2)地质封存系统的长期稳定性和安全性提供理论依据。CO_(2)geological storage is one of the most important means to mitigate the greenhouse effect.The safety of CO_(2)securely stored in underground reservoirs largely depends on the mechanical integrity of the caprock.This paper establishes a coupled fluid-solid model for CO_(2)geological storage to study the changes in pore pressure,vertical displacement,and effective stress in the caprock during the CO_(2)injection process.It analyzes the effects of CO_(2)injection rate,caprock elastic parameters,and geostress factors on the occurrence of tensile and shear failures in the caprock.The results indicate that,at the initial stage of CO_(2)injection,changes in pore pressure,vertical displacement,and effective stress at the bottom of the cap near the injection well are significant but gradually stabilize thereafter.The area near the injection well is considered the most critical part of the caprock,where the risk of mechanical failure is greatest.During the CO_(2)injection process,the injection rate and geostress factors have the most significant impact on the occurrence of mechanical failures in the caprock.The findings of this study provide a theoretical basis for assessing the long-term stability and safety of CO_(2)geological storage systems.

关 键 词：CO_(2)地质封存 盖层 拉伸破坏 剪切破坏 数值模拟 

分 类 号：TE19[石油与天然气工程—油气勘探] P554[天文地球—构造地质学]