BRAZIL CAMPOS TTI KIRCHHOFF PHASE 2 Pre-stack Depth Migration

Multi-client 2D Survey, 40,961 km

ACQUISITION PARAMETERS Acquisition Date: 1999 - 2001

Shooting Orientation: 2D basin strike and dip Gun Depth: 6m

Shot Point Interval: 37.5m Group Interval: 25m

Streamer Depth: 7m Streamer Length: 8000 - 8100m

Record Length: 12s Sample Interval: 2ms

Nominal Fold: 106 - 108

 

TIME PRE-PROCESSING SEQUENCE Data processing performed by: WesternGeco Brazil – Completed December 2015

Reformat SEG-D to Omega Format Navigation/Seismic Data Merge & Trace Edit Designature (De-bubble), Zero Phase Conversion & Adaptive Deghost Resample 2 to 4ms 07 Passes Swell / Anomalous Amplitude Attenuation (AAA) 03 passes in the Shot Domain 04 passes in Offset Domain F-X Decon (RNA) Linear Noise Attenuation & Seismic Interference Noise Elimination (SINE) 2D Surface Related Multiple Elimination (2D SRME) Weighted Least Squares Radon Multiple Attenuation (WLS Radon) Surface Consistent Amplitude Corrections (SCAC) Inverse-Q Compensation(Phase Only) Time Variant Filter (TVF)

BRAZIL CAMPOS TTI KIRCHHOFF PHASE 2 Pre-stack Depth Migration

Multi-client 2D Survey, 40,961 km

DEPTH PROCESSING SEQUENCE Data processing performed by: WesternGeco Brazil – Completed February 2016

3D Grid Definition Seismic Data Preparation Migration Geometry 1D Anisotropic Travel Time Inversion (VIVA) Anisotropic Parameters Estimation (Delta 3% & Epsilon from ETA) Initial Velocity Model Building 04 Anisotropic Tomography Updates on Sediment Area Top of Salt Interpretation Refinement Salt Flooding Base of Salt Interpretation Final TTI Anisotropic KPSDM and TTI Anisotropic RTM Residual Normal Move-Out Correction Using SCVA Method Depth to Time Conversion Weighted Least Squares Radon Demultiple (WLS Radon) Angle Stacks (Full 0-30, Near 0-15, Mid 15-30 & Far 30-45) Principal Components Reconstruction (PCR) Time Variant Filter (TVF) Inverse-Q (Amplitude Only) Residual Amplitude Analyses & Compensation (RAAC) Output Seg-y

AVAILABLE TIME DELIVERABLE Pre-migration final de-multiple CDP gathers

AVAILABLE DEPTH DELIVERABLES

Final Migration Gathers After Residual Demultiple with Residual Velocity Applied; Final KPrSDM Stack Raw & Enhancements; Final Angle Stack Enhancements (Near, Mid, Far); Final Velocity Model (Azimuth, Delta, Dip, Epsilon & V-p); Final Residual Velocity Field Final CMP Coordinates; Final Processing Report.

29 September 2016