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258

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De Soto Canyon

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Viosca Knoll

Mississippi Canyon

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Main Pass

S. & E. Addition

87°W

87°W29

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29°N

28°N

28°N

N:\Pub lic\GIS\A rc Ma p Docu men ts\GoM\SpecSh eet Maps\3D \H ern and o FWI RT M 3 D (P ort )_High ResKirchTT I RTM 3 D.m xd Ma y 26, 20 15

HERNANDO FWI RTM 3DMULTI-CLIENT 3D SEISMIC SURVEY

0 7 14 21 283.5

Miles

!( Checkshot Wells Used For Output Migration (To be Determined)

HERNANDO FWI RTM 3DPRE-STACK DEPTH MIGRATION (PSDM)

MULTI-CLIENT 3D SURVEY

ACQUISITION PARAMETERS

Acquisition Date: 13 November 2008 – 17 June 2009 15 January 2009 – 12 March 2009

Dual Source: Clustered airgun arrays – 4320 cubic inches 4130 cubic inches

Source Interval: 62.5m per subsurface line (31.25m flip-flop)

75m per subsurface (37.5m flip-flop)

Streamer Length: 8100m x 6 7500m x 6 Number of Channels: 648 per streamer / 3888 per shot 600 per streamer / 3600 per shot

Group Interval: 12.5m 12.5m Record Length: 13000ms 14336ms

Sample Interval: 2ms 2ms Multiplicity: 64 fold at 6.25m bin interval 50 fold after 2 to 1 sum

Recorded Bin Size: 6.25 x 40m 6.25 x 40m Primary Navigation: DGPS for the vessel

RGPS for front and tail buoys Extensive in-sea acoustic system

Orca 1.6.1

Recording Instrument: Sercel Seal II 408 SEG-D 8036 rev. 1 Dual Recording Cable Type: Sercel Liquid filled RDP Geostreamer 24 bit

Cable Depth: 9 meters +/-1 meter 15 meters +/-1 meter Filters: 3 Hz (6 dB/oct) – 200 Hz (370 dB/oct) 4.4 Hz (12 dB/oct) – 214 Hz (341

dB/oct) Gun Depth: 7.5 meters +/-1 meter 9.0 meters

Shooting Direction: NorthEast / SouthWest NorthWest / SouthEast Acquired By: M/V BOS ARCTIC M/V Atlantic Explorer

TIME PROCESSING

Processing performed by TGS Imaging-Houston

Input NAVMERGE data (2ms sample rate)

Debubble and Zero Phasing Shot domain noise attenuation Water Column Statics Shot and channel sensitivity correction Water column statics Noise attenuation II (if needed) Shallow water demultiple (SWME) True Azimuth 3D Multiple Elimination (TAME™) Output TAME™ shot ordered tapes Linear noise attenuation Bandwidth Enhancement with Clari-Fi™ Q compensation (phase only) Geo-spreading compensation and filtering

AVAILABLE TIME DELIVERABLES

Designature /shot ordered data Designature filter wavelet (ASCII) Preprocessed- No Demultiple /shot ordered data TAME™ /shot ordered data Processed source-receiver navigation – UKOOA Post Stack navigation – bin center (UKOOA)

HERNANDO FWI RTM 3D PRE-STACK DEPTH MIGRATION (PSDM)

MULTI-CLIENT 3D SURVEY

PROPOSED TTI ANISOTROPY PSDM PROCESSING

Input preprocessed gathers Reduce fold for velocity model building iterations Build Vz velocity model FWI Velocity update in shallow karst area Image-Guided Tomography update with Kirchhoff TTI PSDM (up to 2 passes) Anisotropy parameter update, if needed Kirchhoff depth migration (sediment flood iteration) Interpret top of salt (TOS) maximum three iterations Kirchhoff and RTM depth migrations (salt flood iteration) Interpret base of salt (BOS) maximum three iterations Overhang tomography using Kirchhoff PSDM gathers (maximum 2 iterations) Subsalt tomography update using Kirchhoff PSDM gathers Subsalt velocity analysis via Delay-Image-Time (DIT) scans using RTM PSDM Final RTM (40 Hz max. freq.) and Kirchhoff 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 18,300 m.

AVAILABLE DEPTH DELIVERABLES

Final PSDM volumes – 25m x 30m bins Kirchhoff final PSDM stack volume - raw Kirchhoff final PSDM stack volume - processed Kirchhoff final PSDM CMP gathers without RNMO RTM final PSDM stack volume - raw RTM final PSDM stack volume - processed Final sediment interval velocity field Final velocity model with salt – unsmoothed Final anisotropy fields with salt (delta, epsilon,inline dip, crossline dip)

Interpolated top of salt (TOS) horizons (ASCII) Interpolated base of salt (BOS) horizons (ASCII) Interpolated water bottom (WB) horizons (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

26 May 2015