NGA OPL 257 | PGS

Southern Niger Delta - Nigeria - 2001/2002/2003

NGA OPL 257 3D

Conventional MultiClient 3D data offshore Nigeria
Website Map for Survey NGA_257_MC3D
The area is characterized by a thick Neogene section deposited in a deep water setting in the outer compressional zone of the Niger delta. The targets are shoreward-dipping toe-thrust structures within the sand/shale Agbada formation that sole out in the over pressured shale of the Akata formation.
Proven reservoir facies within the Agbada formation often visible as a large turtle-back anticlines were deposited in channel and turbidite lobe environments, with hydrocarbon bearing reservoirs tying closely to the seismic amplitudes.
The processing improved the imaging and more accurate mapping of the tectonic features of the area with additional requirement for high-resolution of the data and effective attenuation of multiples in order to improve mapping of the fault systems and deltaic packages.

Specifications

Survey summary

  • Type: 3D
  • Size: 538 sq.km
  • Acquisition year: 2001/2002/2003
  • Completion of processing: 2004
  • Water depth: 1 700-2 000 m
  • Shooting direction: 90/270
  • Vessels: Ramform Valiant, Ramform Vanguard
  • In partnership with: DPR

Acquisition parameters

  • Number of streamers: 10
  • Streamer length: 6 000 m
  • Streamer separation: 100 m
  • Shot interval: 25 m
  • Record length: 9 500 ms
  • Sample rate: 2 ms
  • Bin dimensions (Acquisition): 12.5x25 m
  • Fold: 60

Processing

  • Surface Related Multiple Elimination (SRME)
  • Radon Demultiple
  • Bending Ray Kirchhoff Pre-Stack Time Migration (PSTM)

Time products

  • Final Kirchhoff Pre-Stack Time Migrated Stack
  • Angle stacks (Near, Mid and Far)
  • PSTM gathers
  • Stacking and Migration Velocities