Bibliographic record
Abstract
Research Article| September 01, 2006 In-situ stress and coal bed methane potential in Western Canada J.S. Bell J.S. Bell Sigma H Consultants Ltd., P.O. Box 2797, Invermere, BC V0A 1K0 Search for other works by this author on: GSW Google Scholar Bulletin of Canadian Petroleum Geology (2006) 54 (3): 197–220. https://doi.org/10.2113/gscpgbull.54.3.197 Article history received: 15 Nov 2005 accepted: 19 Jun 2006 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 J.S. Bell; In-situ stress and coal bed methane potential in Western Canada. Bulletin of Canadian Petroleum Geology 2006;; 54 (3): 197–220. doi: https://doi.org/10.2113/gscpgbull.54.3.197 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 Laboratory testing has shown that the permeability of clastic rocks is related to confining stress. The same relationships have been demonstrated for coal. Production rates of coal bed methane have been shown to be inversely proportional to stress magnitude in Australia and the United States. Preferred fluid flow axes aligned with SHmax, the larger horizontal principal stress, have been documented. Relevant previous studies are reviewed and discussed. The findings are then applied to central and southern Alberta and specifically to a horizon approximating the MacKay coals of the Upper Cretaceous Belly River Formation. Methods for determining the vertical stress, SV, and the smaller horizontal stress, SHmin are described and a data base is assembled from published data concerning micro-fracture and mini-fracture instantaneous shut in pressures, fracture breakdown pressures and leak-off pressures. This data base is used to generate a series of maps which are interpreted using relationships established outside Western Canada to establish optimum locations for coal bed methane productivity at the selected stratigraphic horizon. The paper ends with a plea to acquire more local primary data relating in-situ stress to the permeability and productivity of subsurface coal seams. 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 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 | 0.002 |
| Science and technology studies | 0.002 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 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".