Sedimentological, Ichnological, and Architectural Characteristics of Geobodies in a Fluvial to Estuary Setting: the McMurray Formation in the Christina River area, NE Alberta, Canada
Notice bibliographique
Résumé
The Lower Cretaceous McMurray Formation is the primary host of the crude bitumen reserves in the Athabasca Oils Sand Region. The regionally extensive meander belts associated with estuary point bars have been recognized as the primary reservoir facies in the McMurray Formation. It is widely accepted that dune sands of the cross-bedded sandstone (CB) and point bar heterolithic stratified sandstone and mudstone bedsets (IHS) are the two main facies constituents in the estuary meander belts. Previous studies on the McMurray Formation have emphasized subsurface datasets, which apply regional scale stratigraphic relationships and facies characteristics. These studies commonly generalize the interpretation of the two major facies as a continuous point bar succession: CB represents thalweg-associated sand dunes or the lower part of estuary point bars, and IHS represents the middle to the upper part of the point bars. A detailed investigation of variable geobodies in different parts of a fluvial-estuary setting is generally lacking in the McMurray Formation. This project provides variable solutions to fill the gap in the above questions. In addition to conventional facies analyses through core and outcrop logging of the McMurray Formation, bedding orientational characteristics of geobodies are analyzed using photogrammetric 3D models of the studied outcrops. The objects of this dissertation are: 1) establish a local stratigraphic framework that can be compared to regional stratigraphy of the McMurray Formation; 2) establish a correlation between lithofacies and dipmeter tadpole log characteristics of estuary point bars; 3) integrate sedimentological, ichnological, and bedding orientational characteristics of depositional units to produce solutions of paleoenvironment reconstruction; and 4) investigate architectural stacking pattern of geobodies in fluvial to estuary settings. The key results of this dissertation are: 1) the established local stratigraphic framework reveals estuary channel filles developed from progradation of inner estuary channels during regression, and the internal stacking pattern of point bars can be resolved through the interpretation of dipmeter tadpole plots; 2) the CB facies of sand dunes is not always associated with estuarine channel thalweg or lower point bars, middle estuary sand dunes have been efficiently differentiated from point bars from their forward-accretion bedding configuration; 3) four types of deposits are identified in the McMurray Formation progressing from fluvial to the estuary (fluvial deposits, tidally influenced fluvial deposits, inner estuary point bars, and middle estuary compound dunes) through detailed comparison in the sedimentological, ichnological, and architectural characteristics of geobodies. The recognition and investigation of variable geobodies of the McMurray Formation are crucial for establishing stratigraphic models and paleogeographic reconstructions in sedimentologically complex fluvial to estuary settings.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».