A standard lithofacies scheme for the Missisauga and Logan Canyon formations of the Scotian Basin and its application to long sections of conventional core
Bibliographic record
Abstract
This report proposes a hierarchical scheme of sedimentary facies applicable to the Lower Cretaceous rocks of the Missisauga and Logan Canyon formations in the Scotian Basin. This succession hosts the major gas discoveries in the basin. The eleven facies, each of which is divided into several subfacies, are: 0 - delta front sandstone-mudstone turbidites; 1 - open shelf fossiliferous shales; 2 - shoreface sandstones and mudstones; 3 - intervals of condensed sedimentation (principally during transgressions); 4 - tidal estuary to fluvial sandstones; 5 - intertidal to subtidal sandy to mixed flats; 6 - intertidal muddy to mixed flats; 7- tidal marsh lignite or carbon-rich mud; 8 - lagoonal muds; 9 - river mouth to prodelta sandstone turbidites; 10 - highly deformed sediments. These facies have been applied to long logged sections of conventional core in the following wells: Alma K-85, Alma F-67, Cohasset A-52, Como P-21, Glenelg E-58, Glenelg E-58A, Glenelg H-59, Glenelg N-49, Kegeshook G-67, North Triumph G-43; Panuke B-90, Tantallon M-41, Thebaud C-74, Thebaud I-93, Venture B-13, Venture B-52, and Venture H-22. Three characteristic vertical successions of facies are recognized: prodelta, shoreface, and tidal parasequences. The prodelta parasequence is found in both inboard and outboard wells, however it is the dominant parasequence in outboard wells (e.g., Alma and Glenelg fields). Tidal parasequences are common in inboard wells (Cohassett A-52, Como P-21, Kegeshook G-67, and Panuke B-90) but are also found in wells farther outboard (North Triumph G-43, Thebaud I-93, Venture B-52, and Glenelg N-49). Shoreface parasequences are generally foundwithin more inboard wells including Cohasset A-52, Panuke B-90, Thebaud I-93, and Venture B-13 and B-52. This facies scheme is general enough to apply to both inboard and outboard wells in the Scotian Basin, while having enough subfacies to capture details within each depositional environment.
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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".