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Lloyd Ridge
De Soto Canyon
Destin Dome
Viosca Knoll
Atwater Valley
Mississippi Canyon
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784788
693694
87°W
87°W29
°N
29°N
28°N
28°N
TGS-NOPEC has used its best efforts to produce this map free of errors, utilization of same shall be at the sole risk of the user.
TGS-NOPEC assumes no liability or responsibility for reliance placed thereon.
N:\Public\GIS\Arc Map Documents\GoM\SpecSheetMaps\3D\Hernando Phase I&II (Port)_TTI RTM 3D.mxd July 29, 2016
HERNANDO TTI RTM 3D
Projection: WGS 1984 UTM Zone 16N
MULTI-CLIENT 3D SEISMIC SURVEY0 7 14 21 283.5
Miles
!( Checkshot Wells Used For Output Migration (To be Determined)
HERNANDO TTI 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
PRE PROCESSING Processing Completed January 2010
Input SEGD data Merge navigation with seismic trace headers Output navigation merge shot ordered tapes
(SEGY) Apply start of data (SOD) correction Debubble and convert to zero phase Resample from 2ms to 4ms Noise attenuation Trace drop (25m group interval)
True azimuth multiple elimination (TAME) Output shot ordered TAME tapes (SEGY) Velocity analysis Spherical divergence Noise attenuation (if needed) Radon de-multiple and water column statics Residual multiple attenuation Q compensation (phase only) Output Radon CDP gathers (SEGY)
ANISOTROPIC TTI KIRCHHOFF and RTM DEPTH MIGRATION PSDM Processing Flow
Processing Completed December 2012
Input Data and Initial Model Building
Input multi-client processed Radon CDP gathers Input final VTI sedimentary velocity model Edit and smooth Vz, delta and epsilon models using well(s) in the area Estimate inline and crossline dips from previous VTI PSDM stack Build initial TTI velocity model
HERNANDO TTI RTM 3D PRE-STACK DEPTH MIGRATION (PSDM)
MULTI-CLIENT 3D SURVEY
ITERATION I – High Resolution Shallow Tomography KIRCHHOFF TTI PSDM
Output 25x40m, 32 fold, 4000m depth, 5m step Tomographic update to define velocity field
ITERATION II – Tomography Update KIRCHHOFF TTI PSDM
Output 50x40m, 32 fold, 6000m depth, 10m step Output area = Input area Tomographic update to define velocity field
ITERATION III – First Pass of Karst Modeling KIRCHHOFF TTI PSDM
Output 50m x 40m, 32 max fold (up to 3,000 m offset) 6,000 m max depth, 10 m depth step
Update velocity model in the Karst zone and above interpreted horizon
ITERATION IV – Second Pass of Karst Modeling RTM TTI and KIRCHHOFF TTI PSDM
RTM Output 50m x 40m, 6,000 m maximum depth, 10 m depth step, 25Hz
Kirchhoff Output 50m x 40m, 32 max fold , 6,000 m max depth, 10 m depth step
Update velocity model in the Karst zone and above interpreted horizon
ITERATION V – sub-Karst Tomography KIRCHHOFF TTI PSDM
Output 50m x 40m, 32 max fold, 10,000 m max depth, 10 m depth step
Tomographic update to define velocity field
ITERATION VI – Define Top of Salt KIRCHHOFF TTI PSDM
Output 50m x 40m, 32 max fold, 10,000 m max depth, 10 m depth step
Interpret top of salt horizon ITERATION VII- Define Base of Salt RTM TTI and KIRCHHOFF TTI PSDM
Output RTM 50m x 40m, 12,000 m maximum depth, 10 m depth step, 25Hz)
Output Kirchhoff 50m x 40m, 32 max fold , 12,000 m max depth, 10 m depth step
Interpret base of salt horizon INTERATION VIII –Define Second Top of Salt RTM TTI and KIRCHHOFF TTI PSDM
RTM Output 50 50m x 40m, 12,000 m maximum depth, 10 m depth step, 25Hz
Kirchhoff Output 50m x 40m, 32 max fold , 12,000 m max depth, 10 m depth step
Interpret second top of salt horizon ITERATION IX- Define Second Base of Salt RTM TTI and KIRCHHOFF TTI PSDM
RTM Output 50m x 40m, 15,000 m maximum depth, 10 m depth step, 25Hz
Kirchhoff Output 50m x 40m, 32 max fold , 16,000 m max depth, 10 m depth step
Interpret second base of salt horizon ITERATION X – Subsalt Tomography KIRCHHOFF TTI PSDM
Output 50m x 40m, 32 max fold, 16,000 m max depth, 10 m depth step
Tomographic update to define velocity field
HERNANDO TTI RTM 3D PRE-STACK DEPTH MIGRATION (PSDM)
MULTI-CLIENT 3D SURVEY FINAL KIRCHHOFF AND RTM PRE-STACK DEPTH MIGRATION
KIRCHHOFF TTI PSDM: Output: 25 m x 40 m RTM TTI PSDM: Output: 25 m x 40 m POST MIGRATION PROCESSING: Convert to time High resolution Radon Convert to depth Inner trace mute & stack Interpolate to 25 x 20 m Depth variant filtering Signal enhancement (F-Kx-Ky power) Scaling
__RTM PARAMETERS__
Max Frequency: 35Hz Migration Aperture:
Depth step: 8,000m 10 m
Final Total Depth: 16,000m Output Bin Size: 25x40m
__KIRCHHOFF PARAMETERS__
Max Frequency: 75Hz Migration Aperture: 8000m
Maximum Dip: Depth step:
90° (turning wave) 5 m
Final Total Depth: 16,000m Output Bin Size: 25x40m
PSDM DELIVERABLES
Kirchhoff PSDM raw stack (25 x 20 m interpolated) Kirchhoff PSDM final stack (25 x 20 m interpolated) RTM PSDM raw stack (25 x 20 m interpolated) RTM PSDM final stack (25 x 20 m interpolated) Kirchhoff PSDM gathers, without residual moveout (25 x 40 m spacing) Sediment velocity model in SEGY (in depth) – 25x20m Sediment anisotropy fields (delta, epsilon) SEGY (in depth) – 25x20m Final velocity model with salt in SEGY (in depth) – 25x20m Final anisotropy fields with salt (delta, epsilon, inline dip, crossline dip) SEGY (in depth) – 25x20m Interpreted top of salt horizons (includes TOS1 +TOS2+TOS3- ASCII) Interpreted base of salt horizons (includes BOS1+BOS2+TOS3- ASCII) Interpreted water bottom horizon (ASCII)
29 July 2016
