Geomechanics of Heterogeneous Bitumen Carbonates
Bibliographic record
Abstract
Abstract Around 26% of Alberta's bitumen resources are held in carbonate formations. Due to the lack of efficient technologies to extract bitumen from carbonates these resources are currently classified as "inaccessible". Among possible technologies, thermal recovery methods will be a strong option for recovery of bitumen from carbonates. Amongst thermal recovery methods, Steam Assisted Gravity Drainage (SAGD) is one of the best methods originally developed and successfully used for oil sands in Alberta. However, because of heterogeneity, lower permeability and deeper position of bitumen carbonates, steam injection method may not be as effective in bitumen carbonate reservoirs as they are in oil sands. Alternate heating methods such as electrical ohmic heating and higher frequency (radio frequency and microwave) electromagnetic methods are strong alternative options. During a thermal recovery process, stress state within the reservoir is significantly altered due the thermal stresses and steam pressure. The new stress state can impact the multiphase flow of steam and bitumen by enhanced permeability or stimulated fractures. All the previous studies on geomechanics of thermal recovery methods have been focused on SAGD and that only for oil sands and because of fundamental differences between bitumen carbonates and oil sands the results are not applicable for carbonates. Change of permeability in carbonates under elevated stresses would not necessarily be caused by shear failure and it could emerge by connecting the isolated vugs or stimulation of the existing fractures. A fully coupled electro-thermo-hydro-mechanical (ETHM) model based on multiphysics platform is used to study the simultaneous interaction between non-isothermal multiphase flow in the carbonates and stresses and strains in the reservoir. The advantage of multiphysics modeling by COMSOL Multiphysics is that being a general-purpose simulator it offers a possibility for multi-physical coupling via the wide choice of application modes such as electrical or chemical. Heterogeneity of the carbonate is modeled through a probabilistic distribution of mechanical and hydraulic properties to account for inherent variability in carbonate properties.
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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 | 0.000 | 0.000 |
| 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) | 0.001 | 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 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".