Offshore BrazilBRAZIL SANTOS TTI KIRCHHOFF

PRE STACK DEPTH MIGRATION MULTI-CLIENT 2D SURVEY

ACQUISITION PARAMETERS Acquisition Date: 1999 - 2001

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

Shotpoint 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: TGS-Imaging Houston, TX USA – Completed: Sept 2012

Input merged source-receiver navigation and seismic Anti-alias and resample to 4ms Debubble & zero phasing Coherent and random noise suppression Surface related multiple elimination (SRME) Low frequency enhancement Radon multiple rejection using primary velocity Offset domain noise attenuation– output PRE MIGRATION FINAL DEMULTIPLE

AVAILABLE TIME DELIVERABLE

Pre migration final de-multiple CDP gathers (106 fold)

Offshore BrazilBRAZIL SANTOS TTI KIRCHHOFF

PRE STACK DEPTH MIGRATION MULTI-CLIENT 2D SURVEY

DEPTH PROCESSING SEQUENCE Data processing performed by: TGS-Depth Imaging Houston, TX USA – Completed: Sept 2012

BUILD INITIAL VELOCITY MODEL Build 3-D model from 2-D PSDM velocity field.

ISOTROPIC KIRCHHOFF PSDM & SEDIMENT TOMOGRAPHY UPDATE Input 12.5m, 106 fold, 12s, 4ms step Output 25m, 53 fold, 16km, 10m step, migration aperture 8000m

CALIBRATE WELLS INTO 3D VELOCITY MODEL DETERMINE ANISOTROPIC PARAMETERS

Calculate dip field. Estimate delta and epsilon parameters by focusing analysis. TTI ANISOTROPIC KIRCHHOFF PSDM and SEDIMENT TOMOGRAPHY UPDATE

Input 12.5m, 106 fold, 12s, 4ms step Output 25m, 53 fold, 16km depth, 10m step, migration aperture 8000m Sediment tomography update

TTI ANISOTROPIC KIRCHHOFF PSDM and CARBONATE TOMOGRAPHY UPDATE Input 12.5m, 106 fold, 12s, 4ms step Output 25m, 53 fold, 16km depth, 10m step, migration aperture 8000m Carbonate tomography update

TTI ANISOTROPIC KIRCHHOFF PSDM and INTERPRET TOP SALT Input 12.5m, 106 fold, 12s, 4ms step Output 25m, 53 fold, 16km depth, 10m step, migration aperture 8000m Interpret top of salt and salt flood

TTI ANISOTROPIC KIRCHHOFF PSDM and INTERPRET BASE SALT Input 12.5m, 106 fold, 12s, 4ms step Output 25m, 53 fold, 16km depth, 10m step, migration aperture 8000m

TTI ANISOTROPIC KIRCHHOFF PSDM and SUBSALT TOMOGRAPHY UPDATE Input 12.5m, 106 fold, 12s, 4ms step Output 25m, 53 fold, 16km depth, 10m step Subsalt tomography

FINAL TTI KIRCHHOFF PSDM Input 12.5m, 106 fold, 12s, 4ms step Output 25m, 53 fold, 16km depth, 5m step, migration aperture 10000m

RESIDUAL MOVEOUT CORRECTION 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 pre-stack depth migrated - processed

CONVERT DEPTH TO TIME Using final migration velocity volume Output: Kirchhoff PSDM processed - converted to time w/ MIGVEL FINAL

AVAILABLE DELIVERABLES

Kirchhoff pre-stack depth migrated - raw (12.5m, 16km, 5m depth step) Kirchhoff pre-stack depth migrated - processed (12.5m, 16km, 5m depth step) Kirchhoff PSDM processed - converted to time w/ MIGVEL FINAL (12.5m, 14sec, 4 ms s/r) Kirchhoff PSDM gathers with residual RNMO (25m, 53 fold, 16km, 5m depth step) Final velocity volume SEGY (12.5m, 16km, 5m depth step) Sediment interval velocity field SEGY (12.5m, 16km, 5m depth step) Interpreted water bottom, top of salt, and base of salt horizons (ASCII)

15 April 2014