If carbon capture and storage (CCS) needs to be deployed at basin- or larger-scale, it is likely that multiple sites will be injecting carbon dioxide (CO₂) into the same geologic formation. This could lead to excessive pressure buildup, overlapping induced pressure fronts, and pressure interference with neighboring uses of the subsurface. Extracting the in situ brine from the storage formation could be necessary to relieve pressure constraints; control migration of the CO₂ plume, displaced brine, and the induced pressure front; and sequester more CO₂ while reducing potential risks. Such active pressure management could be very costly, and it could present a formidable economic constraint on the feasible scale of deployment of CCS. Alternatively, there may be high-injectivity zones (“storage sweet spots”) where a significant volume of CO₂ could be stored without producing brine. For simulated deployment of CO₂ storage sites across the Illinois Basin, the results of this study suggest that brine production could be required to sequester 20 % or more of the regional CO₂ emissions of major stationary sources in the Mount Simon Sandstone saline formation. In some cases, brine production could expand pressure-limited CO₂ storage capacity enough to more than compensate for the additional costs of pressure management, but only if produced brine could be cheaply reinjected onsite for disposal in an overlying geologic formation. With or without brine production, this study found that the lowest-cost deployment option was to inject CO₂ only into a potential storage sweet spot of the Mount Simon Sandstone.

如果需要在流域或更大规模地部署碳捕获和封存（CCS），则可能有多个站点将二氧化碳（CO ₂）注入同一地质构造中。这可能导致过多的压力累积，重叠的感应压力前缘以及压力干扰地下的相邻用途。为了减轻压力限制，可能有必要从储层中提取盐水。控制CO ₂羽流的迁移，盐水的置换和诱发的压力前缘；并隔离更多的CO ₂同时降低潜在风险。这种主动压力管理的成本可能很高，并且可能对CCS的可行部署规模造成巨大的经济约束。或者，可能存在高注入区（“最佳储油区”），在其中可以存储大量的CO ₂而不会产生盐水。为了模拟在伊利诺伊盆地的CO ₂储存地点的部署，该研究的结果表明，可能需要盐水生产来封存西蒙山砂岩盐岩地层中主要固定源区域CO ₂排放量的20％或更多。在某些情况下，盐水生产可能会扩大限压CO ₂存储容量足以弥补压力管理的额外费用，但前提是所产生的盐水可以廉价地重新注入现场以便在上覆的地质构造中进行处置。无论有无盐水生产，这项研究都发现，成本最低的部署方案是仅将CO ₂注入到西蒙山砂岩的潜在储藏最佳位置。