Preliminary geological and geophysical study of a potential CO2 storage site in deep saline aquifers of the Bécancour area, St. Lawrence Lowlands, Québec
Bibliographic record
Abstract
Summary Deep saline aquifers of the Becancour area represent one of potential reservoir types for CO2 storage in the St. Lawrence Lowlands. The saline aquifers are recognised at three stratigraphic levels, which include from top to bottom: limestones of the Trenton Group, dolomites of the Beekmantown Group and sandstones of the Potsdam Group. The aquifers are found at medium depths varying from 795 m for Trenton limestones to 1224 m for the Potsdam sandstones. The thin-bedded gas reservoir in dolomitic sandstones of the Beekmantown Group is localised at 968.5-982 m. Generally, the intervals of saline aquifers and potential reservoir rocks in the Becancour area are characterised by relatively small thicknesses (1-15 m) and limited extension with rather random distribution of porosity in the permeable zones. To localise and trace out high porosity and permeability stratigraphic levels, analyses of well logs and seismic profiles have been undertaken. Identification of fault and fractured zones in the area may help to assess potential CO2 cross-formational and land surface leakage. The Cambrian-lower Upper Ordovician sedimentary successions of the St. Lawrence Lowlands in the Becancour area are mostly flat-lying dipping gently to the NW above the rotated blocks in the Grenvillian basement separated by the SE-dipping normal faults. The regional Chambly-Fortierville syncline principally affects the Upper Ordovician foreland basin units above the Trenton-Utica Shale level. The regional Yamaska normal fault affects the Grenvillian basement and the overlying sedimentary successions with progressive deepening of the top of the basement from the NW (1250-1350 m) to the SE (>2600 m). Thicknesses and facies variations in sedimentary units across the Yamaska normal fault testify that a syn-sedimentary displacement (about 800 m) along the fault occurred likely during its load-induced syn-Taconian reactivation ahead of the developing Appalachian thrusts. The SE-vergent reverse fault that locally affects the Lower-Middle Ordovician units in the Becancour area is likely related to graben inversion during the late Taconian shortening. The gentle anticlines occur in the Potsdam-Trenton units above isometric or slightly SW-NE extended uplifts in the Grenvillian basement. The anticlines that contain permeable levels under cap rock units of Utica shale and Lorraine turbidites could represent potential traps for CO2 storage.
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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) | 0.002 | 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".