Modeling of Lithological Heterogeneity in a Heavy Oil Reservoir, Long Lake Property in the Athabasca Oil Sand Region, Northeastern Alberta
Bibliographic record
Abstract
The objective of this research was to characterize lithological heterogeneity of the McMurray Formation, which is highly complex lithologically, both laterally and vertically. This study effectively characterizes the complete sedimentary succession of the McMurray Formation with physical and textural properties of rock. The physical properties are represented by specific surface area (SpSA) and dominant grain size (GS) and textural properties are characterized by tortuosity (τ/T), cementation exponent (m), tortuosity exponent (a) and pore aspect ratio (α). All these properties are derived by modifying empirical equation and presented in the form of continuous log, which is completely a new approach in presenting these data for the entire sedimentary succession. As all these parameters are derived using the conventional log data, therefore, there vertical resolution is similar to the resolution of conventional log, which is very important in generating high resolution 3D geo-cellular model. The continuous form of these data enables us to create 3D models, which facilitate to study their spatial distribution in a larger dimension, provide competency in cross-examining the related properties and can help to mitigate various heterogeneity related operational/production problems within the McMurray Formation. Application of these parameters in various permeability models enable to calculate permeability for the lithology ranging from unconsolidated sand to claystone/mudstone with honouring textural properties of rock. Successful application of ‘m’ and ‘a’ parameters in the permeability models validate the concept that ‘m’ and ‘a’ are not fixed for any particular lithology. The establishment of this concept is a significant outcome of this research, which indicates a new way of their application in petrophysics. Similarly, permeability results with the incorporated ‘α’ parameter in the Kozeny-Carman equation reveal that ‘α’ is a very strong textural parameter for permeability, and it appears that ‘α’ can be taken as a part of the coefficient of Kozeny-Carman equation.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".