Clean energy storage potential (hydrogen and CAES) in salt formations of Western Canada: a geological review
Bibliographic record
Abstract
Underground H 2 gas storage (UHS) and compressed air energy storage (CAES) are two novel applications of salt caverns essential for net-zero carbon economy. This review assesses rock salt units available for UHS and CAES in the subsurface of the Western Canada Sedimentary Basin (WCSB). In the industrially developed WCSB south of 60° N, thick halite formations for gas storage occur in the Devonian Elk Point Group. Three salt units suitable for cavern emplacement are the Upper Lotsberg Formation halite (≤183 m thick), the Cold Lake Formation halite (mostly ≤40 m but locally >100 m) and halite-dominated occurrences in the Prairie Evaporite Formation (≤210 m). To the north of 60° N, the thickest salt units of the broadest geographical expanse occur in the Saline River Formation of Cambrian age. The Saline River salts stretch across frontier areas and require more subsurface exploration for cavern emplacement potential. Whereas the Elk Point Group salts are entirely undeformed and bedded, the Saline River halites extend into the Laramide Cordillera where they form salt walls and diapirs. The salt caverns of the WCSB are used for liquefied petroleum gas and liquefied natural gas storage and waste disposal. The depth range for cavern emplacement is between the groundwater protection depth ( c . 100–600 m) and 2000 m (lithostatic pressure ( S v ) ≤37 MPa and temperature ≤90°C). There are 196 salt caverns in the public records, of these 133 are currently in UGS or waste disposal use. The vast majority are conventional caverns washed by direct single-well leaching, and 23% of the WCSB caverns are operated with dual or triple entry. Most caverns ( c . 90%) have a volume of less than 300 000 m 3 , and several larger (up to 756 000 m 3 ) caverns are used for permanent waste fill. As of 2025, the first UHS–CAES cavern operation is under construction. The Upper Lotsberg halite is chemically the cleanest and most homogeneous halite in the WCSB that is suitable for UHS, although the occurrence of this salt is most geographically restricted. The Prairie Evaporite salt occurs over the broadest geographical expanse in three provinces but cavern-purposed halites there tend to be less pure. In Saskatchewan, the upper Prairie Evaporite Formation is not suitable for gas storage caverns due to a high content of carnallite and sylvite. In UHS applications, the high reactivity of H 2 and production of H 2 S through microbial sulfate reduction will narrow the choice to the cleanest halite beds with a negligible sulfate mineral content, such as the Upper Lotsberg Formation halite and the cleanest halite occurrences of the Prairie Evaporite Formation.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".