Abstract: Mineralogical and petrographic characteristics of the Cenozoic and Upper Mesozoic reservoirs in Venture B-13 and Arcadia J-16 Wells, offshore Nova Scotia
Bibliographic record
Abstract
The Mississauga (Lower Cretaceous) and Mic Mac (MiddleUpper Jurassic) formations are reservoir rocks for hydrocarbons in the offshore Nova Scotia. Cores from both formations were studied in Venture B-13 and Arcadia J-16 boreholes respectively for their mineralogy and petrography. Clay mineralogy of cuttings from overlying Cenozoic formations in Venture B-13 borehole was also studied. The upper part of the Mississauga core consists of three units of oolitic-fossiliferous arenaceous limestone (total thickness of 5.81 m) alternating with shaly siltstone and oolitic-fossiliferous calcareous sandstone. The amount of oolites and fossils gradually decreases downward as the limestone turns to calcareous sandstone. The deeper intervals of the core are made up of alternating sandstone, siltstone and shale. Shale intervals become more common in the lower intervals. The alternating sandstone units have calcareous cement, but other cementing materials (e.g. microcrystalline silica chert and/or clay) are not uncommon. Some units have high porosity / permeability with almost empty pore spaces. Mic Mac core comprises alternating sandstone, siltstone and shale. Mineralogically both Mississauga and Mic Mac sandstones are rich in quartz with minor amounts of feldspar and mica with sporadic occurrences of glauconite, chamosite, pyrite, iron oxides, bituminous material; accessory amounts of zircon, tourmaline, rutile and variable amounts of calcite, minor chert and clay as cementing material. Fluorescence microscopy confi rms the existence of relict hydrocarbons in these sands. Sand grain size varies from fi ne to coarse and is generally poorly sorted and the grains are subrounded to angular in shape. QmFLt, QtFL, QmFK, QpLvmLsm triangular plots for the main constituents of these sandstones, i.e., quartz, feldspar and lithic fragments show that they are quartzarenites and/or
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| 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 source (direct Gemma or distilled Codex), 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".