Stratigraphic response to sedimentation in a net-accommodation-limited setting, Lower Cretaceous Basal Quartz, south-central Alberta
Bibliographic record
Abstract
Research Article| March 01, 2002 Stratigraphic response to sedimentation in a net-accommodation-limited setting, Lower Cretaceous Basal Quartz, south-central Alberta R.W.C. Arnott; R.W.C. Arnott Department of Earth Sciences and Ottawa-Carleton Geosciences Centre, University of Ottawa, Ottawa, ON KIN 6N5 Search for other works by this author on: GSW Google Scholar B.A. Zaitlin; B.A. Zaitlin EnCana Corporation, 150-9 Avenue SW, Calgary, AB T2P 2S5 Search for other works by this author on: GSW Google Scholar D.J. Potocki D.J. Potocki EnCana Corporation, 150-9 Avenue SW, Calgary, AB T2P 2S5 Search for other works by this author on: GSW Google Scholar Author and Article Information R.W.C. Arnott Department of Earth Sciences and Ottawa-Carleton Geosciences Centre, University of Ottawa, Ottawa, ON KIN 6N5 B.A. Zaitlin EnCana Corporation, 150-9 Avenue SW, Calgary, AB T2P 2S5 D.J. Potocki EnCana Corporation, 150-9 Avenue SW, Calgary, AB T2P 2S5 Publisher: Canadian Society of Petroleum Geologists Received: 19 Apr 2001 Revision Received: 15 Sep 2001 First Online: 02 Mar 2017 Online ISSN: 2368-0261 Print ISSN: 0007-4802 © The Society of Canadian Petroleum Geologists Bulletin of Canadian Petroleum Geology (2002) 50 (1): 92–104. https://doi.org/10.2113/50.1.92 Article history Received: 19 Apr 2001 Revision Received: 15 Sep 2001 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation R.W.C. Arnott, B.A. Zaitlin, D.J. Potocki; Stratigraphic response to sedimentation in a net-accommodation-limited setting, Lower Cretaceous Basal Quartz, south-central Alberta. Bulletin of Canadian Petroleum Geology 2002;; 50 (1): 92–104. doi: https://doi.org/10.2113/50.1.92 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyBulletin of Canadian Petroleum Geology Search Advanced Search Abstract Based on differences in mineralogy, paleovalley morphology, hydrocarbon production history and crosscutting Stratigraphic relationships, the subsurface Basal Quartz in the study area is interpreted to comprise four paleovalley fills consisting of braided-fluvial strata overlain abruptly by meandering fluvial strata. Significantly these strata accumulated in an accommodation-limited part of the basin where net sedimentation rate was only about 1 m/m.y. Accordingly, stratal characteristics contrast markedly with those in more extensively studied nonmarine successions that accumulated in high net-accommodation basins, and include (1) each unconformity bounded sequence is significantly thinner, (2) the upward change from braided-fluvial to meandering-fluvial or tidal strata occurs abruptly, and (3) a general lack of finegrained floodplain mudstone, which improves significantly the lateral connectivity of reservoir sandstones. A long-term effect of limited net accommodation, and the consequent slow aggradation of the sedimentary pile, is the repeated cannibalization of older valley-fill deposits by younger paleovalleys. This creates a stratigraphy consisting of laterally and vertically consistent stratal assemblage dominated by a single, typically the youngest, paleovalley fill. In places, however, parts of older paleovalley fills are preserved as localized remnants surrounded on most sides by younger strata. On a local scale, this results in the development of a significantly more complicated stratigraphy marked by rapid lithological changes, and similarly reservoir quality, even over short horizontal distances. On a more regional scale, the complex crosscutting of different-aged paleovalley fills, in addition to the tendency for each paleovalley to incise from a similar Stratigraphic level, makes Stratigraphic correlation difficult. Together, these characteristics can have significant Stratigraphic and economic ramifications. This content is PDF only. Please click on the PDF icon to access. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.038 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".