The Relation between Stratigraphic Elements, Pressure Regime, and Hydrocarbons in the Alberta Deep Basin (with Emphasis on Select Mesozoic Units)
Notice bibliographique
Résumé
Abstract An integrated stratigraphic and hydrodynamic study of deeply buried Mesozoic units in more than 2000 wells located within the Alberta basin illustrates the relation between reservoir architecture and pressures, contrasts the nature of regional fluid systems within select units of economic importance, and tests published models of fluid behavior in the Alberta basin. We evaluated these aspects for two Mesozoic intervals (Jurassic Fernie Formation and Lower Cretaceous Viking Formation) and, for comparative purposes, a Paleozoic unit (Devonian Nisku Formation). The Nisku Formation is a normally pressured unit where fluid pressures increase systematically with depth in areally extensive carbonates and overpressured zones are restricted to locally developed shale basins. Gas columns have associated downdip aquifers, and water becomes increasingly fresh to the west, closer to regional recharge. Fernie and Viking units pass westward from underpressured, gas-saturated units downdip of aquifers to normally and overpressured zones, and pressures in excess of hydrostatic occur at depths below about 2600 m (8530 ft). Fernie and Viking units have contrasting styles of reservoir distribution. The former are productive from blanket units, whereas Viking production is overwhelmingly obtained from lenticular channel fills. The westward change from subnormal to supranormal pressures in Mesozoic units is associated with the lowest heat flow values and highest geothermal gradients in Mesozoic units of west-central Alberta. In the Viking, the highest pressures are associated with an increase in porosity due to grain dissolution. This article provides several implications for understanding the nature and distribution of hydrocarbons in the Alberta deep basin. Although most studies of Mesozoic units of the Alberta deep basin have emphasized the underpressured nature of reservoirs, a pressure continuum occurs that links shallow, underpressured units with deeper, supranormally pressured zones. The maintenance of supranormal pressures at depth is due to effective vertical and lateral seals located in a zone of low heat flow but high geothermal gradient. Porosity does not progressively decline with depth in all Mesozoic units. Sandstone units containing large numbers of rock fragments and feldspars may display an increase in porosity values with depth where there are high temperatures and pressures. Highly porous sandstones may form reservoirs that have high gas deliverabilities and reserves; therefore, many lithofeldspathic Paleozoic and Mesozoic sandstones in the deepest parts of the Alberta basin may be prospective for petroleum. Generalized models of pressure distribution and maintenance that do not account for reservoir architecture and composition may overlook those apparently anomalous situations that have significant economic potential.
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 | 0,001 |
| 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 ».