Element Definition
Injection zone formation water salinity is defined as the concentration of total dissolved solids (TDS) in formation water within the designated CO₂ injection interval of a geologic storage formation. For this element, formation water salinity includes measured or interpreted TDS values associated with the injection zone, derived from formation water samples, geophysical logs, or regional hydrogeologic models. Only data attributed to formations identified as potential CO₂ storage reservoirs are included.
Mapped Feature Description
This element is displayed as a continuous subsurface raster representing estimated formation water salinity within the CO₂ injection zone across Illinois. Values reflect interpolated or modeled TDS concentrations based on available well data and geochemical analyses at the time of publication. The map does not depict water chemistry constituents other than TDS, temporal variability in salinity, fluid pressure, or fluid movement.
Source: Groundwater Salinity within the Mt. Simon Sandstone in Illinois and Indiana
Suitability Classifications
See how to use suitability classifications.
| Classification | Criteria (Salinity, Parts per Million) |
|---|---|
| Less Suitable | 0-10000 |
| Suitable | 10000-20000 |
| More Suitable | 20000-50000 |
| Most Suitable | >50000 |
| More Information Needed | N/A |