Seismic Velocity And Gravity Models For Capel And Faust Basins

Data from 50 sonobuoys were recorded over the Capel and Faust Basins, 800 km east of Australia, during a 2006 seismic survey for Geoscience Australia's Big New Oil programme. These data were interpreted and forward modelled by ray-tracing to estimate P-wave velocities in the upper sedimentary section and constrain sediment thickness. Gravity and magnetic anomaly data were also recorded, providing additional constraints for the velocity models.

Use Cases

• Model sediment thickness using estimated P-wave velocity ranges (1.9, 2.3-3.0, 3.6-4.7, 5-5.3 km/s) from ray-tracing.
• Correlate gravity anomaly data with depth-converted seismic reflection lines to validate subsurface features.
• Estimate sediment density distribution using gravity models calibrated to a reference density of 2.3 t/m3.
• Map regional sediment thickness variations, identifying areas where it may reach 5 km.

Strengths

• Data from 50 sonobuoys provides multiple measurement points across the survey area.
• Velocity models defined for four distinct subsurface layers with specific P-wave speed ranges.
• Integration of seismic reflection, gravity, and magnetic data provides multi-parameter constraints.

Limitations

• Data is from a single 2006 survey, offering only a snapshot in time.
• Specific row and column counts, sample data, and file sizes are unknown.
• Water depth coverage is limited to the 1500-2000 meter range of the survey.

Provenance

Source

Geoscience Australia's Big New Oil programme, via the Australian Ocean Data Network.

Collection Method

Marine seismic survey GA302 using sonobuoys, with subsequent ray-tracing interpretation and forward modelling.

Time Range

2006

Freshness

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Geography

Capel and Faust Basins, 800 km east of Australia.