Tectono-sedimentary evolution of the Porto basin (NW offshore Portugal): Implications for hydrocarbon exploration
Bibliographic record
Abstract
This study reassesses the evolution and petroleum potential of Porto Basin, based on Basin and Petroleum Systems modeling to evaluate the margin maturity and complemented with new insights in the prediction of lithology variations on the unexplored deep offshore area, consequently contributing to the future hydrocarbon exploration. The Meso-Cenozoic Porto Basin is a rift-type basin located in the NW Iberian margin that evolved into a typical non-volcanic passive margin. It corresponds to the conjugate margin of the Canadian Flemish Pass Basin, where significant commercial discoveries recently occurred. The basin area extends from the shallow offshore platform, westwards beyond the continental slope into the deep offshore (water depth up to 3000 m) and, although with few published data, it had been explored twenty years ago. Good volumes of oil and gas-prone Early and Late Jurassic source rocks (present-day TOC values: 0,5 – 1,6 wt%), as well as different types of reservoirs (e.g. channel-lobe siliciclastics, reef buildups, karstified dolomites) are considered to be present in this basin. Rifting was initiated in the Late Triassic, with the Hercynian structural fabric playing a crucial role in controlling basin architecture. The basin margin's geometry, in which the Porto-Tomar main border fault plays a significant role, has been shaped mainly by Mesozoic extensional tectonics. Some extension-related features such as ENE-WSW trending fault zones evolved into major transfer faults during the second (Late Jurassic) and third (Early Cretaceous) rifting stages. The newly-formed transfer faults reactivated Hercynian structures visible in the onshore domain, and most likely controlled the rift shoulder sediment bypass, leading the sediment input from the onshore/proximal to the distal domains. The basin marginal and internal architecture suggests the existence of several relay-ramp structures that also controlled sediment pathways into the basin's depocenters. Alpine-related orogenies (Pyrenean and Betics) were responsible for late tectonic inversion, inverting normal faults and reversing strike-slip transfer faults as well as creating new structural traps and ultimately destroying pre-existing ones. The Porto Basin tectono-sedimentary evolution had an important impact on petroleum systems, affecting crucial parameters such as subsidence and maturation, siliciclastic accommodation space and depocenters, structural traps and seal integrity.
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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".