摘要
CO_(2)-水-岩相互作用是CO_(2)地质封存的核心问题,CO_(2)的注入打破了岩石-地层水化学平衡,引发的地层水化学性质改变、原生矿物溶蚀和次生矿物沉淀,会导致储层和盖层岩石孔隙度、润湿性、力学性质等物性变化并进而影响CO_(2)的注入能力、封存效率以及封存安全性与稳定性。从CO_(2)-水-岩相互作用机制出发,系统阐述了CO_(2)-水-岩相互作用对地层岩石孔隙度、渗透率、润湿性、力学性质的影响研究进展。研究表明,CO_(2)-水-岩相互作用导致岩石孔隙度和渗透率的变化与其初始孔渗特征和矿物组成密切相关,岩石孔渗特征的改变直接影响储层的注入能力与封存潜力和盖层的封闭能力。润湿性的变化与初始亲水亲油特征有关,CO_(2)-水-岩相互作用通常会减弱亲水岩石而增强亲油岩石的水润湿性,进而影响多相流体在岩石孔隙中的微观分布与渗流特征。由于胶结物溶蚀以及溶蚀孔的形成,CO_(2)-水-岩相互作用会引起岩石损伤,抗压强度、抗拉强度、弹性模量等力学参数减小,一定程度上影响封存安全性。碳中和背景下,微纳米尺度孔隙、深地微生物介导、非纯CO_(2)或工业尾气注入、封存全周期等情景下的CO_(2)-水-岩相互作用及岩石物性响应仍有待深入研究。
The CO_(2)-water-rock interaction is the core issue of CO_(2)geological sequestration.The injection of CO,disrupts the chemical balance of rock-formation water,and the changes in the chemical properties of formation water,primary mineral dissolution,and secondary mineral precipitation will lead to changes in the physical properties of reservoir and caprock,such as porosity,wettability,and mechanical properties and thus directly affect the CO_(2)injection capacity,sequestration efficiency,and sequestration security and stability.Based on the mechanism of CO_(2)-water-rock interaction,this paper systematically expounds on the research progress of the effects of CO_(2)-water-rock interaction on porosity,permeability,wettability,and mechanical properties of formation rocks.The results show that the change in rock porosity and permeability caused by CO_(2)-water-rock interaction is closely related to its initial porosity and permeability characteristics and mineral composition,and the change of rock porosity and permeability characteristics directly affects the injection capacity and sequestration potential of the reservoir and the sealing capacity of the caprock.The change in wettability is related to the initial hydrophilic and oil-philic characteristics.The CO_(2)-water-rock interaction usually weakens the water wettability of the hydrophilic rocks and enhances that of the oil-philic rocks,thus affecting the microscopic distribution and seepage characteristics of the multiphase fluids in the pores of the rocks.Due to the dissolution of cement and the formation of dissolution holes,the CO_(2)-water-rock interaction will cause rock damage,and the mechanical parameters such as compressive strength,tensile strength,and elastic modulus will decrease.To a certain extent,the security of sequestration is affected.Under the setting of carbon neutrality,the CO_(2)-water-rock interaction and rock physical property response under the scenarios of micronano-scale pore,deep microbial mediation,impure CO_(2)or industrial tail gas injection,and full sequestration cycle still need to be further studied.
作者
杨术刚
蔡明玉
张坤峰
曹冬冬
赵兴雷
刘双星
YANG Shugang;CAI Mingyu;ZHANG Kunfeng;CAO Dongdong;ZHAO Xinglei;LIU Shuangxing(CNPC Research Institute of Safety and Environment Technology,Beijing City,102206,China;State Key Laboratory of Petroleum Pollution Control,Beijing City,102206,China)
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2023年第6期80-91,共12页
Petroleum Geology and Recovery Efficiency
基金
中国石油科学研究与技术开发项目“高含盐污水低成本脱盐外排与回注风险监控技术研究”(2021DJ6602),“高效贫水吸收剂开发与采出水回注协同CO_(2)封存技术研究”(2021DQ03-A2)和“低分压气体吸附过程渗流强化机理研究(以二氧化碳为例)”(RISE2022KY06)。
