Facies Architecture of the Doe Creek Member of the Kaskapau Formation, NW Alberta
Bibliographic record
Abstract
Abstract The Upper Cretaceous (Cenomanian) Doe Creek Member, encased in the predominantly marine mudstones of the Kaskapau Formation in northwest Alberta, comprises a series of retrogradationally stacked northeast-southwest trending shoreline deposits. An integrated ichnological and sedimentological analysis of these shorelines reveals a complex depositional relationship between deltaic and open-marine shoreface successions. The shoreline trends in the Doe Creek Member display substantial variability in thickness, sedimentology, and ichnological character along depositional strike stemming from proximity to deltaic point sources. The Doe Creek Member exhibits excellent core control in the subsurface, allowing detailed facies analysis of these multifaceted shoreline deposits. The integration of ichnological and sedimentological analysis yields eleven distinct facies in the Doe Creek Member. The facies represent a variety of depositional environments, including fully marine offshore to shoreface deposits and deltaic deposits (e.g., prodelta, delta front, distributary channels and distributary mouth bars). These facies can be divided into two facies associations, based on recurring vertical successions of regressive delta deposits and open-marine shoreface deposits. The deltaic shorelines consistently develop thicker delta front sandstone packages, fed by associated distributary channels. Penecontemporaneous open marine shoreface sandstones, deposited laterally adjacent to the delta fronts, are typically much thinner and display significantly higher bioturbation intensities, resulting in a lower quality reservoir. This dichotomy of reservoir potential and quality has significant implication for hydrocarbon exploration and exploitation. Unfortunately, the deltaic and open-marine shoreface successions appear almost indistinguishable on gamma-ray well log signatures; this renders well-log cross-sections meaningless in terms of understanding the Doe Creek depositional system. In contrast, detailed core-based cross-sections reveal the complex facies architecture of the coeval deltaic and non-deltaic successions. The facies successions and facies architecture of the ancient shorelines of the Doe Creek Member highlight the inherent complexities induced by deltaic influences on a given coastal environment. Deltaic and open-marine shoreface successions are merely the end-members of a spectrum of coastal regimes in which there exist degrees of deltaic influence. Within each regressive shoreline trend, it can be shown that the degree of deltaic character is determined by the lateral proximity to a riverine point source. Therefore it is possible, based on integrated ichnological and sedimentological facies analysis, to locate riverine point sources on a given shoreline trend in the subsurface, which could provide significant economic returns.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.004 | 0.004 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
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 source (direct Gemma or distilled Codex), 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".