PGS Access™ Westralia | PGS

Australia - Australia

PGS Access™ Westralia 2D GeoStreamer

Regionally consistent 2D PSDM framework to image the deepest structures of the Westralia SuperBasin
Website Map for Survey PGS Access Westralia
PGS is developing a series of uniquely integrated, high-value studies to better delineate the underlying architecture, geology and prospectivity of key basins.
A key objective is to recover crustal scale reflectors from GeoStreamer and conventionally acquired long offset 2D data. This provides the first regionally consistent 2D PreSDM framework across the laterally variable velocity regime of the Northwest Shelf with a harmonized geoscience interpretation.
The PGS Access™ Westralia Study includes a PreSDM reprocessing initiative that will build a geologically and regionally consistent VTI anisotropic velocity model to enable deep crustal imaging.


Survey summary

  • Type: 2D
  • GeoStreamer
  • Size: 11 965 km
  • Acquisition year: 2007-2010
  • Completion of processing: 2015
  • Reprocessing: Yes
  • Shooting direction: Various

Acquisition parameters

  • Number of streamers: 1
  • Streamer length: 7 000-8 100 m
  • Shot interval: 25-37.5 m
  • Record length: 8 000 -12 000 ms
  • Sample rate: 2 ms


  • 2D surface related multiple elimination (SRME)
  • High resolution radon demultiple
  • Kirchhoff prestack depth migration (PSDM)

Depth products

  • Final Kirchhoff PSDM stack
  • Final beam PSDM stack
  • Final RTM PSDM stack
  • PSDM gathers
  • AVO Products (Intercept, Gradient, IxG)
  • PSDM angle stack near
  • PSDM angle stack mid
  • PSDM angle stack far
  • PSDM angle stack u-far
  • Velocity model

Additional products

  • Geological background/history
  • Basin reviews for the North West Shelf
  • High-level prospectivity showing seismic examples from interpreted lines
  • Gravity & Magnetics summaries for key lines
  • Interpretation Report
  • Interpretation