Coupled reservoir-geomechanical analysis of the potential for tensile and shear failure associated with CO2 injection in multilayered reservoir-caprock systems
Coupled reservoir-geomechanical analysis of the potential for tensile and shear failure associated with CO2 injection in multilayered reservoir-caprock systems
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DOI：
10.1016/j.ijrmms.2007.04.006
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发表时间：
2008-02
影响因子：
7.2
通讯作者：
J. Rutqvist;J. Birkholzer;C. Tsang
中科院分区：
文献类型：
--
作者：
J. Rutqvist;J. Birkholzer;C. Tsang
进行了油藏-地质力学耦合模拟，以研究与多层地质系统中地下二氧化碳注入相关的拉伸和剪切破坏的可能性，例如沿着预先存在的裂缝的拉伸压裂和剪切滑移。该故障分析旨在研究影响地质二氧化碳储存系统破裂可能性的因素，并研究估计在不造成此类破裂的情况下可以维持的最大二氧化碳注入压力的方法。我们特别关注二氧化碳向上迁移引起的地质力学应力变化，以及初始应力状态如何影响诱发失效的可能性。我们的结论是，准确估计三维原位应力场对于支持地质二氧化碳注入作业的设计和性能评估至关重要。此外，我们还得出结论，重要的是要考虑在二氧化碳注入储层和地表之间的储层流体压力增加区域之外（例如，在覆盖岩石中）可能发生的机械应力变化。
Coupled reservoir–geomechanical simulations were conducted to study the potential for tensile and shear failure—e.g., tensile fracturing and shear slip along pre-existing fractures—associated with underground CO2-injection in a multilayered geological system. This failure analysis aimed to study factors affecting the potential for breaching a geological CO2-storage system and to study methods for estimating the maximum CO2-injection pressure that could be sustained without causing such a breach. We pay special attention to geomechanical stress changes resulting from upward migration of the CO2and how the initial stress regime affects the potential for inducing failure. We conclude that it is essential to have an accurate estimate of the three-dimensional in situ stress field to support the design and performance assessment of a geological CO2-injection operation. Moreover, we also conclude that it is important to consider mechanical stress changes that might occur outside the region of increased reservoir fluid pressure (e.g., in the overburden rock) between the CO2-injection reservoir and the ground surface.