The Prospective Seal Unit Spatial Extent Database for U.S. Sedimentary Basins (version 1) contains a series of spatial datasets representing spatial extents of publicly available data for prospective caprock and seal rock units. Seals are relatively impermeable rock units that forms a barrier or seal above and around the reservoir rock preventing fluid from migrating beyond the reservoir (slb Energy Glossary, 2024). The database is designed to support subsurface gas storage feasibility and resources assessment (e.g. CO2 storage) by aggregating and displaying the spatial extent of prospective seal units to guide users to the original source(s). Prospective seals were selected for integration into the database based on past research efforts under the National Carbon Sequestration Database (NATCARB).

This database leverages publicly available data resources from authoritative sources (e.g. U.S. Geological Survey, State Geologic Surveys, and published reports), and aims to help guide users to understand the prospective seal unit's spatial coverage and data gaps from the regional to sub-basin/field scale. The database is organized by prospective seal unit/formation, including the spatial extent for data found to be available for the prospective seal unit. The various datasets represented include spatial extents of the lithologic formation, depth to top structural contour maps, and thickness/isopach maps.

Included in this submission are the following resources:

1. Geodatabase/Dataset: “prospective-seal-unit-extents-v1.gdb”

2. ReadMe: “ReadMe Prospective Seal Unit Spatial Extent Dataset V1.pdf”

3. Data Catalog: “prospective-seal-unit-spatial-extents-data-catalog-v1.xlsx”

This is the first version of the prospective seal unit spatial dataset and is current based on the date published. Effort has been made to collect as much data as possible for the creation of the database. Continual efforts are ongoing to update the database, with an expected update in early 2025. Future updates may include additional regions within United States sedimentary basins. There is no guarantee of completeness of data for all areas, and should be evaluated for individual user’s requirements. Use of this database is solely at the discretion of the user.

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