Tunisia 2D

Configuration
Acquisition mode                   2D
Acquisition bin length            2.5 m
Line orientation                      Various

Energy Source 

Shot Interval                            25m
Sub Array Separation            14.7m
Source Type                            I/O Sleeve Guns
Air Pressure                            2000 psi
Volume                                    3410in³
Sub-arrays                              4
Source Depth                         8m

 

Streamer

Streamer Length                    7050mm

Streamer Depth                     9m (±1m)

In-line Offset                           120-130m

No. of Groups                         564

Group Interval                        12.5 m

Group Length                        12.5 m

 

Data Recording

Record Length                      7 seconds
Sampling Rate                     2.0 ms
Low-cut Filter                        2.8Hz / 6dB per Octave
Hi-cut Filter                           200 Hz / 370dB per Octave
Format                                  SEG-D 8048, 3590 

 

Navigation

Positioning System 1       C-Nav
Positioning System 2       C-Nav

PROBABLE PROCESSING FLOW:
Reformat: SEGD to PGS Internal Format
Geometry: Apply 2D geometry
Edit: Selected bad shots and channels zeroed
Statics: System delay
Filter: Low cut and anti-alias filter
Resample: From 2ms to 4ms
Filter: Designature
Spherical Divergence: 1/T**2
Trace Drop: Drop alternate traces
SRME: Surface related multiple elimination
Velocity Analyses: NMO velocities on a 2km grid

Radon demultiple
MDA: Multiple diffraction attenuation
NMO: Picked DMO velocities on a 1km grid
Mute: Outer trace mute
Inner trace mute
2D DMO stack
Tvf: Pre-mig.Band pass filter (TVF)
Gain: Pre-mig gain
2D Migration: CFDMIG finite differenc three cascade using picked NMO vels
Tvf: Band pass filter (TVF)
Gain: Residual gain or AGC
Gun + cable correction
  
AVAILABLE DATASETS:
Raw Stack SEGY
Raw Migration SEGY
Final Migration SEGY