Time-lapse Electrical Resistivity Imaging of Methane Gas Migration in a Shallow Confined Aquifer
Bibliographic record
Abstract
In order to quantify, and develop tools to monitor, fugitive methane emissions from well-bore environments, a field experiment was carried out in which an 85% methane composite gas was injected into a near surface confined aquifer at a rate of 1.5 m3 per day, for 66 days. The site is located in north-eastern British Columbia where the Quaternary glacial deposits are typical of the environment for the majority of energy wells in Western Canada. Temperature-corrected time-lapse electrical resistivity tomography (ERT) was utilized to monitor the migration and fate of the gas plume during the injection period. Three permanently-installed ERT lines were deployed, centred on or close to the injection location. The data were inverted using SimPEG producing time-lapse difference images. Results show resistivity increases of up to 15% near the injection zone. The gas plume is interpreted as migrating upward and spreading laterally beneath a low permeability layer.
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 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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 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) | 0.008 | 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; both teacher heads agree on what is shown here.
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".