WCG2011 | PGS

Central Graben - UK - 2011

WCG2011 3D GeoStreamer®

Superior interpretability points to new deeper potentials
Website Map for Survey MC3D-WCG2011
Covering the middle of the West Central Graben and West Central Shelf, this survey targets the Guillemot and Gannet complexes as well as several other oil and gas discoveries (Paleogene and Upper Jurassic).
The Permo-Triassic and Late Jurassic rift phases shaped the basin's structural framework and triggered the halokinesis of a thick Zechstein interval. Discoveries (Jurassic and Palaeogene reservoir) are situated on salt-cored anticlines and fault blocks. Sub-salt fault blocks are clearly visible.
The clear imaging of the Zechstein allows for superior interpretability of both salt flanks and pre-salt structural closures, which indicate new deeper potentials. The interplay between halokinesis and faulting is unraveled, resulting into a more reliable structural and play fairway analysis.

Specifications

Survey summary

  • Type: 3D
  • GeoStreamer®
  • Geometry: Standard
  • Size: 1 370 sq.km
  • Acquisition year: 2011
  • Completion of processing: 2012
  • Water depth: 85/100 m
  • Shooting direction: 66
  • Vessels: Ramform Viking, Atlantic Explorer

Acquisition parameters

  • Number of streamers: 12/6
  • Streamer length: 6 000 m
  • Shot interval: 18.75 m
  • Record length: 7000/7680 ms
  • Sample rate: 2 ms
  • Bin dimensions (Acquisition): 18.75 x 6.25 / 25.0 x 6.25 m
  • Bin dimensions (Processing): 12.5 x 12.5 m
  • Fold: 80

Processing

  • Dual Sensor Wave Field separation and P-UP generation
  • 3D Surface Related Multiple Elimination (SRME)
  • High Resolution Radon Demultiple
  • XT / Tau-P Deconvolution
  • Anisotropic Kirchhoff Pre-Stack Time Migration (PSTM)

Time products

  • Final Kirchhoff PSTM Stack
  • Angle Stack Near
  • Angle Stack Mid
  • Angle Stack Far
  • Angle Stack UFar
  • PSTM Gathers
  • Stacking Velocity
  • Migration Velocity