The U.S. Environmental Protection Agency’s Class VI regulations for underground carbon dioxide (CO₂) injection require owners and operators of storage projects to identify (1) an Area of Review (AoR) that represents the region that may be affected by the injection of CO₂, and (2) leakage risks that might impact the quality of underground sources of drinking water (USDWs). This article describes how such risks can be determined by accounting for the physical and chemical properties of all components of a CO₂ storage site using elements of the National Risk Assessment Partnership Integrated Assessment Model for Carbon Storage (NRAP-IAM-CS). We used practical data from three sites that are part of two CarbonSAFE (Carbon Storage Assurance Facility Enterprise) projects to demonstrate application of the NRAP-IAM-CS toolset to determine project risk areas.

NRAP-IAM-CS was used to estimate the project risk area that could represent the AoR and the impact of leakage through legacy wells to overlying drinking waters at these candidate CO₂ storage sites. Our study shows that risk to USDWs is minimal despite (1) the presence of multiple legacy wells at these sites where the AoR approximates the maximum extent of injected CO₂ or (2) the presence of a much larger AoR approximating the pressure front caused by the injection of CO₂.

美国环境保护局针对地下二氧化碳（CO ₂）注入的VI类法规要求存储项目的所有者和运营商确定（1）代表可能受到注入CO ₂的区域的区域（AoR）。（2）可能影响地下饮用水水质（USDWs）的泄漏风险。本文介绍了如何通过考虑CO ₂的所有成分的物理和化学性质来确定此类风险使用国家风险评估合作伙伴碳存储综合评估模型（NRAP-IAM-CS）的元素存储库。我们使用了来自两个CarbonSAFE（碳储存保证设施企业）项目一部分的三个站点的实践数据，以演示NRAP-IAM-CS工具集在确定项目风险领域中的应用。

NRAP-IAM-CS用于估计可能代表AoR的项目风险区域，以及通过遗留油井泄漏到这些候选CO ₂储存地点上覆饮用水的影响。我们的研究表明，尽管（1）在这些站点上存在多个遗留井，其中AoR近似于注入的CO ₂的最大程度，或者（2）存在更大的AoR近似于由压力引起的压力前沿，但USDWs的风险很小。注入CO ₂。