The permeability of a reservoir is a key parameter to determine the pressure response due to production and injection and its concomitant geomechanical response. A fractured reservoir affects the fluid flow by increased permeability, which can be further enhanced by elevated pore pressure. The CO₂ storage project at Krechba, In Salah, Algeria, was concluded in 2011, but it provided unique and valuable geomechanical data and still remains an important site to study geomechanical processes. It has previously been shown that fracture injection, i.e. injection of CO₂ above fracture pressure, is an important transport mechanism. Here we analyze the pressure response from the many temporary shut-ins during injection to justify a proposed correlation between pressure and permeability (power-law expressions) in the reservoir. The correlation is validated using field-data: pressure response in the reservoir and surface heave from InSAR data. Although the shut-in curves from pressure data at In Salah cannot provide the permeability directly, due to its complex injection history (rate and duration), they can show how the permeability varies with pore pressure and provide evidence of the fracture pressure. A recently developed efficient up-scaled numerical model of fully coupled poroelasticity and two-phase flow that effectively captures the main processes in the high-aspect ratio reservoir of In Salah, allows for the current analysis. This model illustrates that a static geomodel cannot explain the observed pressure response and surface heave, and is subsequently used to fit the parameters in the proposed correlation for the pressure-dependent reservoir permeability. Although there are three injection wells at In Salah, KB501, KB502 and KB503, this study is supported primarily by the data from KB501 and KB503. The correlation for the reservoir permeability provides a good match with both the pressure response in the reservoir and the surface heave above the injection wells, thus illustrating that irreversible and non-elastic processes can be approximated with non-linear material properties. For KB502 the geological setting is much more complicated and the response and behavior around the injection well is strongly depending on the behavior of a large and intersecting fracture zone and it still remains crucial to characterize properties of fault/fracture zones, such as thickness, transmissivity, stiffness and porosity.

储层的渗透率是确定由于生产和注入而引起的压力响应及其伴随的地质力学响应的关键参数。裂缝的储层通过增加渗透率来影响流​​体流动，渗透率的增加可以进一步提高渗透率。位于阿尔及利亚萨拉赫市Krechba的CO ₂封存项目于2011年结束，但它提供了独特而有价值的地质力学数据，仍然是研究地质力学过程的重要场所。先前已经表明，裂缝注入，即CO ₂注入高于断裂压力，是重要的输送机制。在这里，我们分析了注入过程中许多临时关井的压力响应，以证明储层中压力与渗透率之间的拟议相关性（幂律表达式）。使用现场数据验证了相关性：InSAR数据中的储层压力响应和地表起伏。尽管In Salah压力数据的闭合曲线不能直接提供渗透率，但由于其复杂的注入历史（速率和持续时间），它们可以显示渗透率如何随孔隙压力变化并提供压裂证据。最近开发的，完整的多孔弹性和两相流耦合模型的高效放大数值模型，可以有效地捕获In Salah高纵横比储层中的主要过程，允许进行当前分析。该模型说明静态地质模型无法解释观测到的压力响应和地表起伏，随后被用于拟合与压力相关的储层渗透率的拟议相关性中的参数。尽管在萨拉赫（In Salah）有三口注入井，KB501，KB502和KB503，但这项研究主要由KB501和KB503的数据支持。储层渗透率的相关性与储层中的压力响应以及注入井上方的表面隆起都提供了良好的匹配，因此说明了具有非线性材料特性的不可逆过程和非弹性过程可以近似进行。