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Time-Depth Functions for the Otway Basin

Created 17/10/2025

Updated 17/10/2025

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The seismic stacking velocity data in the Otway Basin are a useful dataset for calculating depths and sediment thicknesses. This work presents time-depth relationships computed from unsmoothed stacking velocities and compares these with functions obtained from sonobuoy refraction data and exploration well sonic logs. The comparison suggests that a total sediment thickness over-estimate for the Otway Basin of about 15% can be expected from the depths derived from stacking velocities alone. On the other hand, for sediment thickness calculations down to ~3 s two-way travel time below sea floor, stacking velocity data give comparable depths to those obtained from the sonic logs. A piece-wise formula is offered which scales the time-depth function for the Otway Basin in order to compensate for the depth overestimate inherent in using stacking velocities to calculate total sediment thickness.

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Additional Info

Field Value
Title Time-Depth Functions for the Otway Basin
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/536fd891-4fb9-4d29-9aa6-99cf5b18be8c
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        137.0,
        -42.5
      ],
      [
        145.5,
        -42.5
      ],
      [
        145.5,
        -36.75
      ],
      [
        137.0,
        -36.75
      ],
      [
        137.0,
        -42.5
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Time-Depth Functions for the Otway Basin". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/time-depth-functions-for-the-otway-basin