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Time-depth functions for the Great Australian Bight Basins

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Created 20/01/2025

Updated 20/01/2025

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The seismic stacking velocity data in the Great Australian Bight are a useful dataset for calculating depths and sediment thicknesses. This work presents time-depth relationships computed from an unfiltered stacking velocity database and compares these with depths from sonobuoy P-wave velocities and exploration well sonic logs. The comparison suggests that a total sediment thickness over-estimate for the Ceduna Sub-basin of about 15% can be expected from the depths derived from stacking velocities. On the other hand, for sediment thickness calculations down to ~4 s two-way travel time below sea floor, stacking velocity data give comparable depths to those obtained from the wells' sonic logs. A piece-wise formula is offered which scales the time-depth function for the Ceduna Sub-basin in order to compensate for the depth overestimate inherent in using stacking velocities to calculate total sediment thickness. Megasequence boundary depths are calculated for the Ceduna Terrace to further illustrate data quality.

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Title Time-depth functions for the Great Australian Bight Basins
Language eng
Licence notspecified
Landing Page https://devweb.dga.links.com.au/data/dataset/a71dc6f1-9fe1-4bed-9ae3-dbc506a18f68
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 22/04/2018
Geospatial Coverage {"type": "Polygon", "coordinates": [[[125.0, -37.0], [135.0, -37.0], [135.0, -31.0], [125.0, -31.0], [125.0, -37.0]]]}
Data Portal data.gov.au

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This dataset was originally found on data.gov.au "Time-depth functions for the Great Australian Bight Basins". Please visit the source to access the original metadata of the dataset:
https://devweb.dga.links.com.au/data/dataset/time-depth-functions-for-the-great-australian-bight-basins

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