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Gigante 2D Survey 188,496.98 km

Gigante 2D (port).mxd April 19, 2017

GIGANTE 2DMULTI-CLIENT 2D SEISMIC SURVEY

0 60 120 180 240 30030

Kilometers

GIGANTE 2DTime and Depth Processing

MULTI-CLIENT 2D SURVEY; 188,497 km

ACQUISITION PARAMETERS

TIME PROCESSING SEQUENCE

Data processing by: TGS Imaging, Houston TX

Merge navigation to trace headers (2ms) Input QC and geometry assignment Velocity analysis Debubble Noise attenuation Shot and channel amplitude correction Source and receiver deghosting (broadband processing) with Clari-FiTM Conversion to zero phase Dynamic redatum to sea level Resample from 2 to 4ms 2D SRME Tau-P Decon for shallow water demultiple Trace drop with anti-aliasing filter Velocity analysis High resolution radon demultiple Inverse Q correction (phase only) Migration velocity analysis (2 passes) Apex shifted demultiple Residual noise attenuation Curved ray Kirchhoff pre-stack time migration Velocity update (auto-picked 2nd order and ETA correction) High resolution radon demultiple Residual noise attenuation Mute and stack Post-stack processing; amplitude Q, spectral shaping, noise attenuation, scaling

Acquisition Date: 2015 – 2016 Data Acquired By: SeaBird Exploration

Mileage: 187,267 km (estimated)

Acquisition Vessels: Osprey Explorer, Hawk Explorer, Northern Explorer, Aquila Explorer, Harrier Explorer

Shooting Orientation: NW-SE / SW-NE / E-W / N-S Recording Instruments: Sercel Seal 428

Streamer Type: Sercel ALS (Acquisition Line Section) - Fluid Vessel Positioning: Dual Veripos Ulta/Apex2

Airgun Source: 5100 cubic inches Airgun Depth: 8.0 meters

Shotpoint Interval: 37.5 meters Group Interval: 12.5 meters

Recording Channels: 960 Streamer Depth: 15.0 meters

Streamer Length: 12000 meters Record Length: 16 seconds

Sample Interval: 2 milliseconds Nominal Fold: 160

GIGANTE 2DTime and Depth Processing

MULTI-CLIENT 2D SURVEY; 188,497 km

AVAILABLE TIME DELIVERABLES

Navigation merge (2ms) Pre-migration final de-multiple CDP gathers Pre-stack time migrated CDP gathers without NMO Pre-stack time migrated CDP gathers with NMO Raw migration Processed migration Angle stacks (near, mid, far, ultra-far and full angle) Migration velocities (ASCII) Migration velocity trace volume – RMS (SEGY) Stacking velocities (ASCII & SEGY)

DEPTH PROCESSING SEQUENCE

Data processing by: TGS Imaging, Houston TX

Build initial velocity model Build regional 3D model from 2D PSTM velocity field

Determine anisotropic parameters by calibrating to wells Extract 2D velocity, delta and epsilon from 3D models TTI anisotropic Kirchhoff PSDM and sediment tomography update (3 iterations) TTI anisotropic Kirchhoff PSDM and interpret top of salt (2 iterations) TTI anisotropic Kirchhoff and RTM PSDM and interpret base of salt (2 iterations) TTI anisotropic Kirchhoff PSDM and subsalt tomography update Final TTI Kirchhoff and RTM PSDM Post-stack processing

Depth Variant Filtering; Signal Enhancement; Scaling Generate 3D model with final velocities

AVAILABLE DEPTH DELIVERABLES (Products available before and after 3D tying)

Kirchhoff PSDM raw migration - (12.5m, 20km, 5m depth step) Kirchhoff PSDM processed migration - (12.5m, 20km, 5m depth step) Kirchhoff PSDM gathers with residual RNMO and demultiple applied - (12.5m, 20km, 5m depth step) RTM depth raw migration - (35 Hz,12.5m, 20km, 5m depth step) RTM depth processed migrated – (35 Hz, 12.5m, 20km, 5m depth step) Final velocity volume in depth - (12.5m, 20km, 5m depth step) Final anisotropy fields (delta, epsilon, inline dip) - (12.5m, 20km, 5m depth step) Sediment interval velocity field - (12.5m, 20km, 5m depth step) Sediment anisotropy fields (delta and epsilon) – (12.5m, 20km, 5m depth step) Interpreted horizons (top of salt, base of salt and water bottom) – in ASCII

19 January 2018