ANG Namibe | PGS

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Namibe Basin - Angola - 2014

ANG Namibe 3D GeoStreamer

Pre and postsalt prospectivity revealed with GeoStreamer 3D acquisition in this frontier basin
Website Map for Survey Block 27-28-29
Over 11 100 sq. km of broadband GeoStreamer 3D data targeting a presalt rift basin over blocks 27, 28, 29 and 11 highlighting the excellent hydrocarbon potential of the basin.
Exploration targets include thick syn-rift sediments hosted in tilted fault blocks with potential sag phase carbonates which lie beneath a well-defined salt layer. Halokenesis leads to excellent postsalt structural trapping potential.
Dualsensor 3D GeoStreamer acquisition combined with modern depth processing workflows are key to identify and unlock the pre and postsalt plays.

Specifications

Survey summary

  • Type: 3D
  • GeoStreamer
  • Geometry: Standard
  • Size: 11 134 sq.km
  • Acquisition year: 2014
  • Completion of processing: 2016
  • Water depth: 100 - 3 000 m
  • Shooting direction: 14/194
  • Vessel: Ramform Valiant
  • In partnership with: ANPG

Acquisition parameters

  • Number of streamers: 12
  • Streamer length: 8 100 m
  • Streamer separation: 100 m
  • Shot interval: 25 m
  • Record length: 10 240 ms
  • Sample rate: 2 ms
  • Bin dimensions (Acquisition): 6.25 x 25 m
  • Bin dimensions (Processing): 12.5 x 12.5 m
  • Fold: 81

Processing

  • P-UP generation
  • 3D surface related multiple elimination (SRME)
  • High resolution radon demultiple
  • Kirchhoff prestack depth migration (PSDM)
  • Beam depth migration

Depth products

  • Final Kirchhoff PSDM stack
  • Final beam PSDM stack
  • Final Kirchhoff offset gathers
  • Raw beam PSDM stack
  • Raw Kirchhoff PSDM stack
  • Raw Kirchhoff PSDM angle sub-stacks
  • Final Kirchhoff PSDM angle sub-stacks

Time products

  • Final demultiple shot gathers
  • Final regularized CMP gathers

Additional products

  • Gravity
  • Magnetics