Seismic Velocity Imaging of the Steen River Crater: Technique Development for Exploring Crater Reservoirs
Notice bibliographique
Résumé
Introduction The ∼25 km-diameter Steen River impact structure, (59 ° 30' N, 117 ° 38' W) is the remnant of the largest known impact crater in the Western Canadian Sedimentary Basin (WCSB). The eroded crater lies buried under ∼200 m of cover with no surface expression necessitating geophysical and drilling projects for its exploration. In this area, the WCSB is composed of ∼1 km-thick gently SW-dipping strata. The terrain is predominantly poorly drained taiga, necessitating winter operation for most exploration and production activities. As of this writing, the crater rim hosts gas production of 30 Mmcf/d from the Slave Point Formation, but a second gas plant is expected to begin production during 2000. Seasonal petroleum production of ∼1000 BOPD occurs from the Keg River Formation. Approximately one dozen Slave Point gas wells have been drilled with sandface AOF potential up to 95 Mmcf/d, and exploration is continuing around the crater rim. Initial gas production was on the regionally high side, the northeastern rim of the crater. Reserves of ∼70 bcf have been established. IMPACT ORIGIN Although Steen River was discovered more than thirty years ago with documented evidence of shock metamorphism 1,2, little has been published about it in the open literature, and its classification as an impact structure has been challenged from time to time. Shock metamorphism was first reported from well 12-19-121-21W5M. An examination of chips recovered from the 3–12 well located ∼3 km SSW of the 12–19 well also reveals abundant evidence of shock metamorphism, and altered and recrystallized melts in a unit once logged as volcanics that immediately underlies the Cretaceous cover. Well 12–19 penetrated impact lithologies immediately below the Cretaceous cover at a depth of 184 m. An ∼120 m thick unit of clay-altered, vesicular rock was recorded on top of the unequivocal crystalline basement rocks 1, establishing a minimum structural uplift of 1000 to 1100 m relative to the surrounding basement surface. The upper unit could be a remnant of crater floor breccias like that found in the 3–12 well rather than representing a dyke contained within the central uplift. GEOPHYSICAL DATA SETS, WELL CONTROL, AND POTENTIAL FIELD MODELLING Hydrocarbon exploration companies have acquired more than one hundred and seventy 2-D seismic reflection profiles over the impact structure, and one 3-D seismic survey has been executed over the northwest corner of the crater rim. Approximately sixty wells have been drilled in and near the crater, providing generally good control for the coherent seismic data. All known hydrocarbon reservoirs occur in structural closures formed by the rim deformation. Reflection seismic data outline parts of the rim uplift in some detail, but most profiles record only chaotic reflectors interior to this. Mapping the impact structure's interior structures has been attempted with magnetic- and gravity-field surveys. In 1995 an aeromagnetic survey with a maximum of 0.5 km line spacing was flown across the entire structure, revealing large-amplitude central and concentric anomalies.
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) | 0,001 | 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 ».