| Titre | Identification of regional structural corridors in the Montney play using trend surface analysis combined with geophysical imaging, British Columbia and Alberta |
| Télécharger | Téléchargements |
| |
| Licence | Veuillez noter que la Licence du gouvernement
ouvert - Canada remplace toutes les licences antérieures. |
| Auteur | Wozniakowska, P; Eaton, D W; Deblonde, C; Mort, A; Ardakani, O H |
| Source | Commission géologique du Canada, Dossier public 8814, 2021, 62p., https://doi.org/10.4095/328850  Accès ouvert |
| Liens | Erratum
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| Image |  |
| Année | 2021 |
| Éditeur | Ressources naturelles Canada |
| Document | dossier public |
| Lang. | anglais |
| DOI | https://doi.org/10.4095/328850 |
| Media | numérique; en ligne |
| Liens | readme
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| Formats | pdf; rtf; dbf (ESRI® ArcExplorer(TM)/ ArcReader(TM)); shp (ESRI® ArcExplorer(TM)/ ArcReader(TM)); docx (Microsoft® Word®) |
| Province | Alberta; Colombie-Britannique |
| SNRC | 82; 83A; 83B; 83C; 83D; 83E; 83F; 83G; 83H; 83J; 83K; 83L; 83M; 83N; 84C; 84D; 84E; 84L; 93A; 93H; 93I; 93J; 93O; 93P; 94A; 94B; 94C; 94F; 94G; 94H; 94I; 94J; 94K; 94N; 94O; 94P |
| Région | Fort St. John; Rivière de la Paix; Dawson Creek; Grande Prairie; Fox Creek; Fort Nelson; Rocky Mountain Foothills |
| Lat/Long OENS | -125.0000 -113.5000 60.0000 52.0000 |
| Sujets | ressources pétrolières; hydrocarbures; bassins sédimentaires; interpretations structurelles; contrôles structuraux; tendances structurelles; analyses du comportement des surfaces; établissement de modèles
structuraux; évolution tectonique; géologie du substratum rocheux; caractéristiques structurales; fosses d'effondrement; failles; plis; interprétations géophysiques; interpretations sismiques; profils sismiques; interprétations de la pesanteur;
interprétations magnétiques; diagraphie des sondages; risque sismique; sismicité; Formation de Montney ; Bassin sédimentaire de l'ouest du Canada; Complexe de Dawson Creek Graben ; Groupe de Wabamun ; Cordillère canadienne; Méthodologie; Contrôle de
la qualité; Données géographiques; Système d'information géographique; combustibles fossiles; géologie structurale; géophysique; tectonique; Sciences et technologie; Nature et environnement; Santé et sécurité; Phanérozoïque; Mésozoïque; Crétacé;
Jurassique; Trias; Paléozoïque; Permien; Carbonifère; Dévonien |
| Illustrations | cartes de localisation; cartes géolscientiques généralisées; organigrammes; profils sismiques; représentations schématiques; tableaux; graphiques; coupes schématiques transversales; diagrammes
stratigraphiques |
| Programme | Les géosciences de l'énergie Ressources d'énergie propre - réduire les risques environnementaux |
| Diffusé | 2021 12 21; 2022 01 07 |
| Résumé | (disponible en anglais seulement)
The Western Canada Sedimentary Basin (WCSB) is a mature oil and gas basin with an extraordinary endowment of publicly accessible data. It contains structural
elements of varying age, expressed as folding, faulting, and fracturing, which provide a record of tectonic activity during basin evolution. Knowledge of the structural architecture of the basin is crucial to understand its tectonic evolution; it
also provides essential input for a range of geoscientific studies, including hydrogeology, geomechanics, and seismic risk analysis. This study focuses on an area defined by the subsurface extent of the Triassic Montney Formation, a region of the
WCSB straddling the border between Alberta and British Columbia, and covering an area of approximately 130,000 km2. In terms of regional structural elements, this area is roughly bisected by the east-west trending Dawson Creek Graben Complex (DCGC),
which initially formed in the Late Carboniferous, and is bordered to the southwest by the Late Cretaceous - Paleocene Rocky Mountain thrust and fold belt (TFB). The structural geology of this region has been extensively studied, but structural
elements compiled from previous studies exhibit inconsistencies arising from distinct subregions of investigation in previous studies, differences in the interpreted locations of faults, and inconsistent terminology. Moreover, in cases where faults
are mapped based on unpublished proprietary data, many existing interpretations suffer from a lack of reproducibility. In this study, publicly accessible data - formation tops derived from well logs, LITHOPROBE seismic profiles and regional
potential-field grids, are used to delineate regional structural elements. Where seismic profiles cross key structural features, these features are generally expressed as multi-stranded or en echelon faults and structurally-linked folds, rather than
discrete faults. Furthermore, even in areas of relatively tight well control, individual fault structures cannot be discerned in a robust manner, because the spatial sampling is insufficient to resolve fault strands. We have therefore adopted a
structural-corridor approach, where structural corridors are defined as laterally continuous trends, identified using geological trend surface analysis supported by geophysical data, that contain co-genetic faults and folds. Such structural trends
have been documented in laboratory models of basement-involved faults and some types of structural corridors have been described as flower structures. The distinction between discrete faults and structural corridors is particularly important for
induced seismicity risk analysis, as the hazard posed by a single large structure differs from the hazard presented by a corridor of smaller pre-existing faults. We have implemented a workflow that uses trend surface analysis based on formation tops,
with extensive quality control, combined with validation using available geophysical data. Seven formations are considered, from the Late Cretaceous Basal Fish Scale Zone (BFSZ) to the Wabamun Group. This approach helped to resolve the problem of
limited spatial extent of available seismic data and provided a broader spatial coverage, enabling the investigation of structural trends throughout the entirety of the Montney play. In total, we identified 34 major structural corridors and number of
smaller-scale structures, for which a GIS shapefile is included as a digital supplement to facilitate use of these features in other studies. Our study also outlines two buried regional foreland lobes of the Rocky Mountain TFB, both north and south
of the DCGC. |
| Sommaire | (Résumé en langage clair et simple, non publié)
Cette étude définit un corridor structurel comme une tendance spatiale latéralement continue définie par un ensemble de caractéristiques
structurelles co-génétiques (failles et plis) déduites à l'aide de données géologiques et/ou géophysiques. Cette approche simplifie le processus d'interprétation de l'association de structures observées à l'aide de différents ensembles de données ;
par exemple, les résidus de surface de la tendance pour des formations spécifiques obtenus à l'aide du contrôle des puits, fournissent une large couverture spatiale qui peut être validée et affinée là où les données sismiques traversent un corridor
structural. |
| GEOSCAN ID | 328850 |
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