Brazil

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Olho De Boi 3D

OLHO DE BOI 3D - CAMPOS BASINMULTI-CLIENT 3D SEISMIC SURVEY

0 10 20 30 405

Kilometers

N:\Public\GIS\Arc Map Documents\LatinAmericaCaribbean\Brazil\SpecSheetMaps\Olho De Boi 3D Spec Sheet (port).mxd August 13, 2014

OLHO DE BOI 3D Pre-stack Time and Depth Migration

Multi-client 3D Survey, 5,767.7 km2

ACQUISITION PARAMETERS

Acquisition date: Nov. 2013 – March 2014 Acquired by: Dolphin Geophysical; m/v Sanco Swift Dual Source: Clustered airgun arrays – 4100 in²

Source Interval: 50m per subsurface line Streamer Length: 7950m x 12 x 100 m

Number of Channels: 636 per streamer - 7632 per shot Group Interval: 12.5 m Record Length: 10060 ms

Sample Interval: 2 ms Multiplicity: 79 fold @ 6.25 m bin interval

Recorded Bin Size: 6.25 x 25 m Primary Navigation: DGPS for the vessel; RGPS for front and tail buoys

Recording Instrument: Sercel Seal Cable Type: Sercel SASS Sentinel RD

Cable Depth: 10 - 25 m +/-1 m Filters: 3 Hz (12 dB/octave) – 200 Hz (370 dB/octave)

Gun Depth: 10 m +/- 0.5 m Shooting Direction: Northwest / Southeast

Navigation: WGS84, UTM Zone 24S

TIME PROCESSING Processed by TGS Imaging, Houston TX

Completed January 2015

Input navigation merge from vessel Merge navigation with seismic trace headers Debubble Denoise Bandwidth Enhancement with Clari-Fi™ Totus Residual zero-phase filter Resample from 2 ms to 4 ms Denoise (as needed) Shot and Channel scaling Apply water column statics True azimuth multiple elimination (TAME™ )

Linear noise attenuation Velocity analysis High resolution radon de-multiple Geo-spreading compensation and filtering (if nee Data regularization Q-inverse Curved ray Kirchhoff PSTM velocity analysis Final Curved ray Kirchhoff PSTM Radon de-multiple Post processing

TIME DELIVERABLES

Raw field data – shot ordered Field data with navigation in the trace headers –

shot ordered, unedited at 2ms TAME™ / shot ordered Radon CDP gathers without NMO Pre-stack time migrated CDP gathers without NMO Pre-stack time migrated CDP gathers with NMO &

Radon Raw Migration

Raw Angle stacks (Near, Mid and Far) Processed migration Migration velocities (ASCII) Stacking velocities (ASCII) 3D Stacking velocity trace volume – (SEGY) 3D Migration velocity trace volume – RMS (SEGY) Processed source-receiver navigation (UKOOA) Post stack navigation – bin center (UKOOA) Gravity data (ASCII)

OLHO DE BOI 3D Pre-stack Time and Depth Migration

Multi-client 3D Survey, 5,767.7 km2

TTI ANISOTROPIC PRESTACK DEPTH PROCESSING Processed by TGS Imaging, Houston TX

Completed March 2015

DEPTH DELIVERABLES

Kirchhoff pre-stack depth migrated volume – raw Kirchhoff pre-stack depth migrated volume – processed RTM pre-stack depth migrated volume – raw RTM pre-stack depth migrated volume – processed Kirchhoff PSDM gathers without residual NMO (Final- in depth) Sediment velocity model in SEGY (in depth) Sediment anisotropy fields (delta, epsilon) SEGY (in depth) Final velocity model with salt in SEGY (in depth) Final anisotropy fields with salt (delta, epsilon, inline dip, crossline dip) SEGY (in depth) Interpreted top of salt horizon (TOS - ASCII) Interpreted base of salt horizon (BOS - ASCII) Interpreted water bottom horizon (ASCII)

17 January 2017

Input preprocessed gathers Reduce fold for velocity model building iterations Build Vz velocity model Kirchhoff depth migration Build anisotropy velocity model Tomography update with Kirchhoff TTI PSDM (5 passes) Anisotropy parameter update, if needed Kirchhoff depth migration (sediment flood iteration) Interpret top of salt (TOS) maximum two iterations Kirchhoff and RTM depth migrations (salt flood iteration) Interpret base of salt (BOS) maximum two iterations Subsalt tomography update using Kirchhoff PSDM gathers Subsalt velocity analysis via Delay-Image-Time (DIT) scans

using RTM TTI PSDM Final RTM (35 Hz max. freq.) and Kirchhoff (75 Hz max. freq.)

TTI PSDM using all shots and receivers Post processing (which may include post-stack interpolation,

depth variant filtering, spectral shaping, signal enhancement and scaling) All final PSDM stack volumes output to 16,000 m.