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335337
Lloyd Ridge
De Soto Canyon
Atwater Valley
Lund
Henderson
Mississippi Canyon
87°W
87°W
88°W
88°W28
°N
28°N
27°N
27°N
AMERIGOMULTI-CLIENT3D SEISMIC SURVEY
0 9. 5 19 28. 5 384. 75
Kil om eters
N:\P ubli c\GIS \Arc Map Docu me nts \GoM\Spe cShee tMa ps\3 D\Ame ri go3 D_N o Spli t_Sp ec ( por t) .mxd July 09, 20 15
AMERIGO 3DPRE-STACK TIME AND DEPTH MIGRATION
(PSTM & PSDM) MULTI-CLIENT 3D SURVEY; 7,538km2
ACQUISITION PARAMETERS Acquisition date: December 2012 – November 2013
Acquisition system: Sercel streamers Source volume: 5,130 cu in (2,000 psi) Source interval: 75 m per subsurface line
Source Separation: 80 m Streamer separation: 160 m
Streamer length: 12,000 m x 8 Number of channels: 960 per streamer / 7,680 per shot
Group interval: 12.5 m Record length: 16,100 ms
Sample interval: 2 ms Fold of coverage: 80
Recorded bin size: 6.25 m x 40 m Primary navigation: ORCA
Recording instrument: SEAL Cable depth: 12 m
Gun depth: 8 m Shooting direction: NW-SE
Acquired by: CGG M/V Geo Caribbean
PROPOSED TIME PROCESSING
Processing performed by TGS Imaging-Houston (Jan., 2013 – Jan., 2015)
Input field data 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 Velocity Analysis Denoise (if needed) Shot and Channel scaling Apply water column statics True azimuth multiple elimination (TAME™ ) Linear noise attenuation High resolution radon de-multiple Geo-spreading compensation and filtering (if needed) Data regularization Q-inverse (Phase only) Curved ray Kirchhoff PSTM velocity analysis Final Curved ray Kirchhoff PSTM Radon de-multiple Post processing
AMERIGO 3D
PRE-STACK TIME AND DEPTH MIGRATION(PSTM & PSDM)
MULTI-CLIENT 3D SURVEY; 7,538km2
PROPOSED TTI ANISOTROPIC PRESTACK DEPTH PROCESSING
Input preprocessed gathers Reduce fold for velocity model building iterations Build Vz velocity model Kirchhoff isotropic depth migration Build anisotropy velocity model Tomography update with Kirchhoff TTI PSDM (3 passes) Anisotropy parameter update, if needed Kirchhoff depth migration (sediment flood iteration) Interpret top of salt (TOS) Kirchhoff and RTM depth migrations (salt flood iteration) Interpret base of salt (BOS) Additional iterations for TOS2, BOS2, TOS3 and BOS3 for interpretation of overhangs, if needed 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 18,300 m.
AVAILABLE PSTM DELIVERABLES Raw field data Field data with navigation TAME™ /shot ordered data Radon CDP gathers without NMO PSTM CDP gathers without NMO PSTM CDP gathers with NMO/Radon Raw PSTM volume Processed PSTM volume Angle stacks (near, near-mid, far-mid, far) Migration & stacking velocities (ASCII) 3D stacking velocity trace volume Processed source-receiver navigation (UKOOA) Post Stack navigation – bin center (UKOOA)
AVAILABLE PSDM 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 horizons (includes TOS1 + TOS2 + TOS3 - ASCII) Interpreted base of salt horizons (includes BOS1 + BOS2 + BOS3 - ASCII) Interpreted water bottom horizon (ASCII) Angle stacks (near, near-mid, far-mid, far) – raw Angle stacks (near, near-mid, far-mid, far) – processed
9 July 2015
