FAULTING-INDUCED PERMEABILITY CHANGE IN SHIRAHAMA SANDSTONE AND IMPLICATION FOR CO₂AQUIFER STORAGE

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• 出版年：2003
• 作者：Li Xiaochun；TakahashiManabu；Wu Zhishen；KoideHitoshi；OhsumiTakashi
• 单位1：CO₂ Storage Research Group，Research Institute of Innovative Technology for the Earth
• 语种：英文
• 作者关键词：rockmechanics；Shirahamasandstone；permeability；brittle-ductiletransition；faultsealing；CO₂aquiferstorage
• 起始页：995
• 总页数：7
• 刊名：岩石力学与工程学报
• 是否内版：否
• 刊频：月刊
• 创刊时间：1982
• 卷：22
• 期：06
• 期刊索取号：P478.066357
• 核心期刊：全国中文核心期刊；中国科协优秀期刊；湖北省优秀期刊；El摘要收录期刊

摘要

The long-term safety assessment of CO₂ aquifer storage requires a deep understanding of permeability evolution during inelastic deformations in sedimentary rocks。The permeability change has been measured in the entire process from elastic，plastic， post-failure to axial stress unloading for Shirahama sandstone subjected to tnaxial compressions under various confining pressures。The measurements revealed that the confining pressure plays an important role in controlling inelastic deformation behavior and the tendency of the permeability evolution。In the brittle faulting regime under a low confining pressure，significant increase in permeability accompanied by dilatancy can be observed. In brittle-ductile transition regime and ductile regime，faulting or inelastic deformation does not necessarily and significantly enhance the permeability，and the permeability during deformation is lower than their corresponding initial values。Microscopic observations revealed that the two mechanisms：（1） shear-enhanced cracking，and（2） grain crushing，are responsible for these inelastic deformation and permeability evolution tendency. The presented results suggested that storing CO₂ in those sites where ductile deformation prevails may be more safe。