Hydrocarbon depleted fractured shale (HDFS) formations could be attractive for geologic carbon dioxide (CO₂) storage. Shale formations may be able to leverage existing infrastructure, have larger capacities, and be more secure than saline aquifers. We compared regional storage capacities and integrated CO₂ capture, transport, and storage systems that use HDFS with those that use saline aquifers in a region of the United States with extensive shale development that overlies prospective saline aquifers. We estimated HDFS storage capacities with a production-based method and costs by adapting methods developed for saline aquifers and found that HDFS formations in this region might be able to store with less cost an estimated ∼14× more CO₂ on average than saline aquifers at the same location. The potential for smaller Areas of Review and less investment in infrastructure accounted for up to 84% of the difference in estimated storage costs. We implemented an engineering-economic geospatial optimization model to determine and compare the viability of storage capacity for these two storage resources. Across the state-specific and regional scenarios we investigated, our results for this region suggest that integrated CCS systems using HDFS could be more centralized, require less pipelines, prioritize different routes for trunklines, and be 6.4–6.8% ($5-10/tCO₂) cheaper than systems using saline aquifers. Overall, CO₂ storage in HDFS could be technically and economically attractive and may lower barriers to large scale CO₂ storage if they can be permitted.

碳氢化合物贫化的裂缝性页岩（HDFS）地层可能对地质二氧化碳（CO ₂）的存储具有吸引力。页岩地层可能能够利用现有基础设施，具有更大的产能，并且比盐水含水层更安全。我们比较了使用HDFS的区域存储容量和集成的CO ₂捕获，运输和存储系统与在美国某地区使用盐分含水层且覆盖潜在盐分含水层的广泛页岩开发的系统。我们通过采用针对盐层含水层开发的方法，通过基于生产的方法和成本估算了HDFS的存储容量，发现该地区的HDFS地层可能能够以较低的成本存储大约14倍的CO _2。平均而言，同一地点的盐水层要多得多。较小的“ Reviews”区域和对基础架构的较少投资的潜力最多占估计存储成本差异的84％。我们实施了一种工程经济地理空间优化模型，以确定并比较这两种存储资源的存储容量的可行性。在我们调查的特定州和地区情景中，我们对该地区的研究结果表明，使用HDFS的集成CCS系统可以更集中，需要更少的管线，为干线分配不同的路线优先级，并且为6.4–6.8％（$ 5-10 / tCO ₂）比使用盐水含水层的系统便宜。总体而言，HDFS中的CO ₂储存可能在技术和经济上具有吸引力，并可能降低大规模CO的壁垒如果可以的话，可以存放_2个。