Canada

Greenland

50°W

50°W

60°W

60°W60

°N

60°N

50°N

50°N

LABRADOR SEA 2D DEEP BASINMULTI-CLIENT 2D SEISMIC SURVEY

0 50 100 150 20025

Kilometers

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Labrador Sea 2D Deep Basin

Labrador Sea 2D

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

14 November 2014

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) Delta Field - SEGY (12.5m, 30km, 5m depth step) Epsilon Field - 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.

14 November 2014

LABRADOR SEA 2D Deep Basin Study Pre-stack Time and Depth Migration Multi-Client 2D Survey; 2,963.1 km