This paper presents a numerical simulation tool for the analysis of coupled processes related to subsurface operations. The tool combines the open-source scientific code OpenGeoSys with the reservoir simulator Eclipse enabling the coupling of thermal, hydraulic, mechanical and geochemical processes. While the coupling of multiphase flow with heat and reactive geochemical component transport has been already implemented, OpenGeoSys-Eclipse is now extended for the coupling of multiphase flow and deformation. By this, OpenGeoSys-Eclipse is capable of addressing the impact of pore pressure changes on rock stability and deformation as well as the feedback effects of geomechanical processes on multiphase flow via pore volume coupling and porosity and permeability update. The coupling is verified by several test cases of gas storage scenarios and compared with reference simulations of OpenGeoSys. The results are in good agreement regarding the general effects of geomechanical feedback on pore pressure as well as porosity and permeability changes. Differences in the results are only observed for the pore volume coupling arising from the different implementation of rock compressibility models in the two simulators. The simulations are furthermore used to investigate the relevance of addressing geomechanical feedback in numerical scenario simulations for the assessment of subsurface operations. The results show clearly, that, depending on the given storage site conditions and rock types, the feedback of deformation on pore pressure can be significant and should therefore be accounted for in the assessment.

中文翻译：

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OGS-Eclipse代码，用于模拟地下多相流和地质力学过程的耦合

本文提出了一种数值模拟工具，用于分析与地下作业有关的耦合过程。该工具将开源科学代码OpenGeoSys与储层模拟器Eclipse相结合，实现了热，水力，机械和地球化学过程的耦合。虽然已经实现了多相流与热和反应性地球化学成分传输的耦合，但现在扩展了OpenGeoSys-Eclipse，以实现多相流与变形的耦合。这样，OpenGeoSys-Eclipse能够通过孔体积耦合以及孔隙率和渗透率更新来解决孔隙压力变化对岩石稳定性和变形的影响，以及地质力学过程对多相流的反馈影响。通过几个储气方案测试案例对耦合进行了验证，并与OpenGeoSys的参考仿真进行了比较。这些结果在地质力学反馈对孔隙压力以及孔隙度和渗透率变化的一般影响方面是一致的。结果的差异仅在两个模拟程序中岩石压缩性模型的不同实现方式引起的孔隙体积耦合中观察到。该模拟还用于调查在数值方案模拟中解决岩土力学反馈与评估地下作业的相关性。结果清楚地表明，根据给定的存储地点条件和岩石类型，变形对孔隙压力的反馈可能非常重要，因此应在评估中加以考虑。