Astrakhanov | PGS

Straits of Tartar, NW coast of Sakhalin Island - Russia - 1998

Astrakhanov 3D

The 545 sq km survey reveals the prospect potential of the Astrakhanov structure
Website Map for Survey Astrakhanov Reprocessed MC3D
The survey was acquired over the Astrakhanov prospect North Sakhalin Island, believed to have significant hydrocarbon potential. The survey covers a very large Upper Miocene-Pliocene compressional anticline, which is heavily compartmentalized. The well, drilled on 2D data, missed the prospect.
The Astrakhanov structure represents a complicated compressional anticline of Pliocene age. In contrast to most of the other discoveries along the Sakhalin shelf, the reservoir comprises of thick and homogenous shallow marine sandstones of Early Miocene age.
The dataset was reprocessed in 2007 using modern pre-stack imaging to reveal the complexity of the fault system, with emphasis on evaluating the remaining hydrocarbon potential. A detailed interpretation report is available.

Specifications

Survey summary

  • Type: 3D
  • Geometry: Standard
  • Size: 545 sq.km
  • Acquisition year: 1998
  • Completion of processing: 2007
  • Reprocessing: Yes
  • Water depth: 9-35 m
  • Shooting direction: NE/SW (73/253)
  • Vessel: Orient
  • In partnership with: DMNG

Acquisition parameters

  • Number of streamers: 4
  • Streamer length: 3 600 m
  • Streamer separation: 100 m
  • Shot interval: 25 m
  • Record length: 6 000 ms
  • Sample rate: 2 ms
  • Bin dimensions (Acquisition): 6.25x25 m
  • Bin dimensions (Processing): 12.5x12.5 m
  • Fold: 36

Processing

  • 2D Surface Related Multiple Elimination (SRME)
  • XT / Tau-P Deconvolution
  • Kirchhoff Pre-Stack Time Migration (PSTM)

Time products

  • Final Kirchhoff PSTM Stack
  • Angle Stack Near
  • Angle Stack Mid
  • Angle Stack Far

Additional products

  • Interpretation