North Atlantic Jurassic petroleum systems: source rock characterization in a conjugate margins perspective of the segment Portugal-Newfoundland.
Bibliographic record
Abstract
The North Atlantic Mesozoic rifting evolved with two main phases: Late Triassic into Early Jurassic and Late Jurassic through Early Cretaceous. This rifting segment between Newfoundland and Iberia can be described as a poor-magma example and its asymmetrical development, due to the multiphase northward propagation caused the differences in the stratigraphy of conjugate margins. The first analysis concerned the oil data: all samples were divided into families with statistical treatment, in according with their geochemical parameters and biomarkers observed in the gas chromatograms. After the oils division, each family presented a geochemical description that led to identify a possible source environment. The source rock identification was done through the Rock-Eval dataset and a subsequent quality control of the data for some selected wells. Several source rocks levels were identified, mainly from Kimmeridgian time, with good original naphthogenic properties calculated. A big part of the project was represented by the realization of maps for the Jurassic and Early Cretaceous stages, using paleo-geographic modeling from ENI contractors and with free-user software, called GPlates, These reconstructions allow to recognize, through geodynamics evolution of the margins, the source rock original depositional environments. In addition to the reconstructions and source analysis, some 1D models were executed to evaluate the potential of the source rocks in terms of hydrocarbons generation and expulsion. The software called PetroMod was used to build burial history and some plots of temperature and vitrinite reflectance versus depth. These modeling were done for few wells because required many data such as completely stratigraphy, lithology and temperature, not always available in the published summary reports. The geochemical oil-source correlations and the interpretations of the paleoenvironments led to identify two main time-steps for the generation of hydrocarbons on both side of North Atlantic Ocean: Oxfordian-Kimmeridgian source rock levels with differently sediment inputs between the basins (marine in Newfoundland, more continental in the Porcupine Basin) and deeper layers dated Sinemurian-Plienasbachian, with black shale or organic-rich facies deposited in carbonate intra-platform basins along Portuguese and Canadian coast.
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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 | 0.004 | 0.003 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.005 | 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; 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".