Due to releasing large amount of greenhouse gases in the atmosphere, some countries were committed to control the expansion of these gases into the environment. The best way to solve this issue is carbon capturing and sequestration (CCS). Injection of CO₂ into the depleted reservoirs is one of the most favorite recommended solutions. Iran contains variety of depleted reservoirs. This makes good opportunity for geological sequestration of CO₂. However, lack of caprock integrity may result in leakage of gas from the reservoir and could endanger the entire project and lead to serious problems. In this paper, a 3D reservoir and geomechanical models are built for a reservoir in Asmari formation that is sealed by Gachsaran-1 caprock. The parameters that are investigated in this challenging reservoir are vertical displacement of caprock, pore pressure changes, horizontal stresses changes, and finally caprock integrity during injection process. The caprock integrity has been studied by Mohr-Coulomb failure criterion, but we observed no failure. In addition, the variation of rock parameters such as poison ratio and young modulus was investigated on the integrity of caprock. The results illustrated that the caprock integrity in this reservoir is not significantly sensitive to above parameters. However, it is sensitive to the horizontal/vertical stress ratio changes. The increase of this ratio would increase the possibility of failure. The vertical displacement of caprock funds to be about 22 mm. The critical rate of CO₂ injection is determined approximately 35.5 kiloton/month after 10 years of injection, which makes this reservoir a suitable option for the geological sequestration.

中文翻译：

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伊朗南部阿斯马里油藏CO 2地质固存的地质力学模型

由于大气中释放了大量的温室气体，因此一些国家致力于控制这些气体向环境中的扩散。解决此问题的最佳方法是碳捕集与封存（CCS）。向耗尽的储层中注入CO ₂是最受推荐的解决方案之一。伊朗拥有各种枯竭的水库。这为CO _2的地质隔离提供了良好的机会。但是，缺乏盖层完整性可能会导致天然气从储层泄漏，并可能危及整个项目并导致严重问题。在本文中，为由Gachsaran-1盖层封闭的Asmari地层中的储层建立了3D储层和地质力学模型。在这个具有挑战性的储层中研究的参数是盖层的垂直位移，孔隙压力变化，水平应力变化，最后是注入过程中的盖层完整性。已经通过Mohr-Coulomb破坏准则研究了盖层完整性，但没有观察到破坏。另外，研究了岩石参数如毒物比和杨氏模量的变化对盖层完整性的影响。结果表明，该储层中的盖层完整性对上述参数不是很敏感。但是，它对水平/垂直应力比的变化很敏感。该比率的增加将增加故障的可能性。盖层基金的垂直位移约为22毫米。一氧化碳临界率注入10年后，确定₂注入量约为35.5吨/月，这使该储层成为地质封存的合适选择。