spec

1. Canada
Greenland
50°W
50°W
60°W
60°W
60°N
60°N
50°N
50°N
LABRADOR SEA 2D DEEP BASIN
MULTI-CLIENT 2D SEISMIC SURVEY
0 25 50 100 150 200
Kilometers
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Labrador Sea 2D Deep Basin
Labrador Sea 2D

2. LABRADOR SEA 2D Deep Basin Study
Pre-stack Time and Depth Migration
Multi-Client 2D Survey; 2,963.1 km
ACQUISITION PARAMETERS
Acquisition Date: Sept. – Oct., 2013
Vessel: Sanco Spirit
Shooting Orientation: Strike and dip to the coastline
Recording Instrument: Geostreamer 24 bit (GAS)
Airgun Source: 4808 cubic inches
Gun Depth: 9 meters
Shotpoint Interval: 37.5 meters
Group Interval: 12.5 meters
Recording Channels: 804
Streamer Depth: 25 meters
Streamer Length: 10,050 meters
Record Length: 18.432 seconds
Sample Interval: 2 milliseconds
Nominal Fold: 134
Survey Size: 2,963 km
TIME PROCESSING SEQUENCE
Data processing performed by: PGS; Houston, TX USA
 SEG-D field data input
 Merge navigation information into trace headers
 Trace Editing
 Swell Noise Attenuation and Despike
 Linear Noise Attenuation
 Wavefield Separation & Extrapolation (Summation)
 SEGY output P-UP dataset
TGS-Imaging; Calgary, Alberta Canada
 Input SEG-Y
 Designature Debubble and Zero phase
 Resample from 2ms to 4ms
 Shot Domain Noise Attenuation
 Tau-P Mute and Decon (as needed)
 2D SRME
 Velocity analysis
 Residual Noise Attenuation
 Velocity analysis- Curved ray Kirchhoff pre stack
time migration
 Residual Multiple Noise Attenuation
 Kirchhoff Curved ray pre stack time migration
 Radon
 Inverse NMO; automatic velocity analysis
 Amplitude recovery
 Mute and stack
 Post migration conditioning: F-X deconvolution,
band-pass filter, scaling, stretched to depth
 Output SEGY
AVAILABLE TIME DELIVERABLES
 Field data with navigation in the trace headers / shot ordered (804 traces/shot)
 Pre-migration final de-multiple CDP gathers (134 fold)
 Pre-stack time migrated CDP gathers without NMO (12.5m, 134 fold)
 Pre-stack time migrated CDP gathers with NMO (12.5m, 134 fold)
 Raw migration
 Processed migration
 Processed migration stretched to depth (12.5m, 30km depth)
 Angle stacks
 Migration velocities (ASCII)
 Migration velocity trace volume – RMS
 Stacking velocities (SEGY & ASCII)
 Processed source-receiver navigation (UKOOA)
 Post stack navigation (UKOOA)
 Ship-borne gravity data
20 August 2014

3. LABRADOR SEA 2D Deep Basin Study
Pre-stack Time and Depth Migration
Multi-Client 2D Survey; 2,963.1 km
DEPTH PROCESSING SEQUENCE
 Data Reception (Input Data post noise and multiple attenuation)
 Initial Velocity Model Build from PSTM Velocities
 Isotropic Kirchhoff PSDM and Tomographic Model Updates I & II (Shallow)
Output 25m CMP, 12km depth, 10m step, 67 fold; Aperture 12000m
 Isotropic Kirchhoff PSDM
 Calculate dip field. Estimate delta and epsilon parameters by focusing analysis. Update Model.
 TTI Anisotropic Kirchhoff Migration and Tomographic Update III & IV (Shallow/Mid)
Output 25m CMP, 12km depth, 10m step, 67 fold; Aperture 12000m
 Percentage Velocity Scans for Deep / Ultradeep. Revise models below 15km.
 TTI Anisotropic Kirchhoff Migration and Tomographic Update V Update (Deep)
Output 25m CMP, 30km depth, 30m step, 67 fold; Aperture 12000m
 Final TTI Kirchhoff and Reverse Time Migrations (RTM on Test Lines only)
Kirchhoff: Output 12.5m CMP, 30km depth, 5m step, 134 fold; Aperture 12000m
RTM: Input all shots @4ms, Output 12.5m CMP, 30km, 10m step, 45Hz; Aperture 8000m
Output: RTM pre-stack depth migrated - raw
 Residual Moveout Correction (Kirchhoff)
Output: Kirchhoff PSDM gathers with residual NMO
 Stack
Output: Kirchhoff pre-stack depth migrated - raw
 Post Stack Processing
Depth Variant Filtering; Signal Enhancement; Scaling
Output: Kirchhoff and Reverse Time Migrations - processed
AVAILABLE DEPTH DELIVERABLES
 Reverse time migration - raw (12.5m, 30km, 5m depth step). Selected Lines
 Reverse time migration - processed (12.5m, 30km, 5m depth step). Selected Lines
 Kirchhoff pre-stack depth migrated - raw (12.5m, 30km, 5m depth step)
 Kirchhoff pre-stack depth migrated - processed (12.5m, 30km, 5m depth step)
 Kirchhoff PSDM gathers with residual NMO (12.5m, 30km, 5m depth step 134 fold)
 Final velocity volume - unsmoothed SEGY (12.5m, 30km, 5m depth step)
 Interpreted water bottom horizon (ASCII)
The processing flow and parameters published herein are the anticipated flow and parameters for the survey and TGS will use commercially
reasonable efforts to follow this flow and parameterization. However, the foregoing notwithstanding, TGS reserves the right to modify the
processing flow and parameters as needed to adjust for timing, testing, and new technologies.
20 August 2014