Atlantic Canada Offshore R&D: Nova Scotia Play Fairway Analysis
Bibliographic record
Abstract
Abstract In April 2009 a comprehensive review of the prospectivity of the offshore Nova Scotia Basin was commissioned by the Offshore Energy Technical Research Association of Nova Scotia (OETR). This was fundamentally based on a complete reevaluation of the exploration history of the Scotian margin. This paper describes the overall approach used in this study and presents the main results and key conclusions. The play fairway program addressed three key issues:Plate Tectonic Reconstruction: a better understanding of the rift history of the Nova Scotia/Morocco conjugate margin pair was needed. Understanding the relationship between rifting and salt deposition is critical in developing models for potential syn-rift and early post rift depositional environment and the development of source rocks.Sequence Stratigraphic Framework: lack of a published modern sequence stratigraphic framework for the margin has impeded the development of robust regional exploration models. Hence the program included a re-evaluation of the biostratigraphy of several key wells, which were integrated with the seismic interpretation, and tectonic models, to build a comprehensive sequence framework.Forensic Geochemistry: although much geochemical data exists on the margin through the many hydrocarbon shows and discoveries, the source rock story was not well understood. The program has undertaken a systematic evaluation of the geochemistry of source rocks and hydrocarbon fluids. An important component of this work was analysis of hydrocarbon bearing fluid inclusion found in the salt. A key goal of this project was to demonstrate evidence for lacustrine or restricted marine early Jurassic source rocks, which would considerably enhance the hydrocarbon potential of the area. The program integrated a number of specialist sub-projects to help develop a robust regional exploration model for the Scotian margin. These included extensive work on biostratigraphy, plate tectonics, seismic interpretation, geochemistry, petroleum systems analysis as well as acquisition of new geophysical data (refraction seismic) and reprocessing of multichannel and existing refraction seismic. The whole integrates to deliver a set of Gross Depositional Environment (GDE) maps built on internally consistent sequence and seismic stratigraphic interpretations. A key component of this was development of a thorough understanding of the salt kinematics offshore Nova Scotia. The complex salt dynamics have had a very significant influence on sediment dispersal pathways and present a significant challenge to oil and gas exploration. The paper shows the underlying geological models that underpin the prospectivity of the Scotian margin. A number of plays can be been defined, including Jurassic carbonates, delta and deep marine reservoir systems, sourced locally or from deeper syn/post rift lacustrine/restricted marine sediments. Extensive large-scale salt related structures show the potential of a high value petroleum province in the under-explored shelf/deep water areas offshore Nova Scotia.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.003 | 0.004 |
| Science and technology studies | 0.002 | 0.000 |
| Scholarly communication | 0.002 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.021 | 0.002 |
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".