Utilising BP's 3-D Seismic to Give New Insights Into the Great Australian Bight
Bibliographic record
Abstract
The Cretaceous-aged deltaic systems (White Pointer; Tiger and Hammerhead) of the Ceduna Sub-Basin within the Bight Basin off the present-day south coast of Australia represent one of the largest underexplored basins in Australia. A new, high-quality 3D seismic volume covering 12,100km2, shot using 8km streamers by BP as part of on-going exploration activity, has provided significant new insight into the basin. The Bight Basin began to form during the mid-late Jurassic as Antarctica and Australia rifted. Separation of India from Antarctica towards the end of the Barremian resulted in the cessation of movement between Antarctica and Australia and the basin entered a thermal sag phase. The basin, and potentially a large proportion of the Australian landmass was flooded during the Aptian. This allowed the deposition of marine mud-prone facies in the clastic-starved Bight Basin. Subsequent base-level fall during the Cenomanian resulted in a major clastic influx in to the basin, with Apto-Albian muds forming a break in mechanical stratigraphy along which the White Pointer listric faults formed during Cenomanian loading could detach. During the deposition of the Tiger delta, major uplift and rotation of a Distal High beyond the White Pointer compressional zone occurs. This structuration is roughly coincident with the shift in Tiger depocentre and may represent renewed extension before eventual continental break up at the end of the Santonian. The Santonian breakup surface forms a significant erosive event across the basin. Post break-up, the deposition of the Hammerhead delta progrades southwards then aggrades. A regional unconformity is present at the top of the Hammerhead that represents clastic shut-off in the basin and the deposition of cold-water carbonate. Understanding the deposition, accommodation space generation and fault movement is key understanding the evolution of these reservoir systems. Detailed mapping and seismic facies work has potentially revealed a complex and diverse petroleum system with multiple reservoirs and structural styles that open up new play potential throughout the Bight.
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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 | 0.001 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 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".