West Niger Delta 2020 Reprocessed | PGS

Niger Delta Basin - Nigeria - 1999

West Niger Delta 2020 Reprocessed 3D

Reprocessed MC3D over blocks OPL 248, 249, 250, 2011 and OML 140 in the Niger Delta Basin.
Website Map for Survey West Niger Delta 2020 Reprocessed 3D
Reprocessing efforts focus on two main structural provinces; the outer fold and thrust belt and the transitional detachment fold zone. Enhanced imaging of targets is achieved with clearer illumination of complex structures associated with the diapiric movement of the Akata Shale Formation.
The main source rock for the prolific petroleum system in the Niger Delta are organic-rich Akata Formation marine shales which underlie unconsolidated sandstone reservoirs of the Agbada Formation. Observed trapping styles include roll-over anticlines, fault closures and subtle stratigraphic traps.
Optimized denoising algorithms and a full deghosting sequence improve data bandwidth and signal-to-noise ratio. The multiple attenuation sequence eliminates complex multiples improving the image integrity.

Specifications

Survey summary

  • Type: 3D
  • Geometry: CLO
  • Size: 3 533 sq.km
  • Acquisition year: 1999
  • Completion of processing: 2020
  • Reprocessing: Yes
  • Water depth: 1000 - 2400 m
  • Shooting direction: 0/180
  • Vessel: Ramform Explorer
  • In partnership with: DPR

Acquisition parameters

  • Number of streamers: 8
  • Streamer length: 4500 / 9255 m
  • Streamer separation: 100 m
  • Shot interval: 37.5 m
  • Record length: 15 872 ms
  • Sample rate: 2 ms
  • Bin dimensions (Acquisition): 6.25 x 25 m
  • Bin dimensions (Processing): 12.5 x 12.5 m
  • Fold: 60

Processing

  • Full source and receiver deghosting (conventional data)
  • Convolutional 3D SRME
  • Wave equation 3D SRME
  • High resolution radon demultiple
  • Anisotropic Kirchhoff prestack time migration (PSTM)
  • Post-migration image optimization

Time products

  • Final Kirchhoff PSTM Stack
  • Angle stack near
  • Angle stack mid
  • Angle stack far
  • Angle stack u-far
  • PSTM gathers
  • Stacking velocity
  • Migration velocity