In situ stress orientations and magnitudes in the Liard Basin of Western Canada
Notice bibliographique
Résumé
Part 1 of this report presents the conclusions reached from identifying and recording the orientations of borehole breakouts recorded on 4-arm dipmeter logs from 47 wells in the Liard Basin of western Canada. Two borehole imagery logs were also examined and they provided orientation data for breakouts and drilling-induced fractures. Twenty-seven of the forty-seven wells exhibited 2 breakout populations. In the majority of wells, the major breakout populations exhibited mean azimuths that cluster between NW-SE and NNW-SSE. These orientations are interpreted to reflect the direction of SHmin, the smaller horizontal principal stress. A few wells exhibited significant breakout populations that were at high angles to this regional trend. It is suspected that, in these cases, nearby fault zones may have deflected the stress trajectories. A table of results has been prepared and all the supporting data are recorded in the Appendix. Figures showing breakout population axes, stress trajectories, and areas where fault zones may be deflecting stresses are included in the text. All the data presented in the report are available in digital format. Part 2 of this report describes gathering and processing subsurface pressure data from the records of wells drilled in the Liard Basin in northwestern Canada. Part 2 of the Liard Basin Study is concerned with establishing principal stress magnitudes at as many locations as possible across the basin and mapping how these parameters vary laterally at strategic horizons. Information from laboratory tests and field observations in numerous oil and gas fields worldwide indicate that oil and gas reservoir permeability is inversely related to rock stress. The less a rock body is compressed, the greater will be its permeability, all other factors being equal. That is the operational justification for this investigation, but it is also anticipated that the findings will contribute to an improved understanding of the tectonic evolution of that part of the Canadian landmass occupied by the Liard Basin. All the data analyzed here are in the public domain and come from well logs, drilling histories and well history reports. These sources of information provided data that was used to estimate the magnitudes of the vertical stress (SV) and the smaller horizontal stress (SHmin). The interpretation of vertical stress variation across the Liard Basin employed density logs from 64 wells. Analysis of these logs allowed a lateral variation in vertical stress magnitude (SV) to be mapped at various depths. The smaller horizontal stress (SHmin) was mapped using leak-off test pressure and fracture breakdown pressures. The larger horizontal stress (SHmax) was determined via numerical simulation of breakout failure, as well as being calculated algebraically. Horizontal and vertical effective stresses were calculated and mapped and their relationship to seismic activity was speculated upon.
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 machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| 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 | 0,002 | 0,002 |
| Études des sciences et des technologies | 0,001 | 0,001 |
| Communication savante | 0,001 | 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 source (Gemma direct ou Codex distillé), 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 ».