66°W
64°W
62°W
60°W
58°W
56°W
SPM
40°N
40°N
42°N
42°N
44°N
44°N
46°N
46°N
Canada
NOVA SCOTIA RENAISSANCE PHASE II
Nova Scotia Renaissance Phase II
MULTI-CLIENT 2D SEISMIC SURVEY
Existing Nova Scotia Renaissance and Bible
20
40
80
120
160
Kilo meters
N: \Pub lic\GI S\ Arc Map Do cu me nts\Ca nad a\Spe cSh eetMa ps\NovaScotiaRe naissan ce PHI I 20 13_Spe c ( port).mxd
66°W
64°W
62°W
60°W
58°W
No vemb er 14, 201 3
38°N
0
NOVA SCOTIA RENAISSANCE PHASE II
Pre-stack Time and Depth Migration
Multi-client 2D Survey; 2518.3 km
ACQUISITION PARAMETERS
Survey/Acquisition Date:
Data Acquired By:
Recording Instrument:
Airgun Source:
Gun Depth:
Shotpoint Interval:
Group Interval:
Recording Channels:
Streamer Depth:
Streamer Length:
Record Length:
Sample Interval:
Nominal Fold:
NS-100 July -Oct 1998
Geco-Prakla
Nessie 3
7918 cubic inches
7.5 meters +/-1 meter
37.5 meters
25 meters
240
9 meters +/-1.5 meters
6000 meters
14.336 seconds
2 milliseconds
80
NS-100 May - Oct 1999
Geco-Prakla
Nessie 3
7918 cubic inches
7.5 meters +/-1 meter
37.5 meters
25 meters
320
9 meters +/-1.5 meters
8000 meters
14.336 seconds
2 milliseconds
106
TIME PROCESSING SEQUENCE
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Data processing performed by: Arcis Seismic Solutions, Calgary
Completed: 30 July, 2013
Input navigation merged seismic @ 4msec
Swell noise attenuation and noise editing
Debubble and zero phasing
Coherent noise suppression
Tau-P Deconvolution (as necessary in shallow water)
Surface related multiple elimination (SRME)
Velocity analysis, one per two kilometers
High resolution radon demultiple
Shifted apex radon or HMT diffracted demultiple – output Pre-migration Demultiple
Migration velocity analysis, one per kilometer – output Migration Velocities
Prima Kirchhoff pre-stack time migration – output PSTM Gathers without NMO
Automatic velocity picking (2nd & high order) – output Stacking Velocities
Final NMO
Radon – output PSTM Gathers with NMO and Radon
Gun and cable static correction
Stack – output Raw Migration
Filter and scale – output Processed Migration
AVAILABLE TIME DELIVERABLES
 Raw field data / shot ordered (SEGD)
 Field data with navigation in the trace headers/shot ordered (240/320 trace/shot)
(From NS-100R survey)
 Radon de-multiple CDP gathers (80/106 fold)
 Pre-stack time migrated CDP gathers without NMO (12.5m, 80/106 fold)
 Pre-stack time migrated CDP gathers with NMO (12.5m, 80/106 fold)
 Raw migration
 Processed migration
 Migration velocities - RMS (SEGY & ASCII)
 Stacking velocities (SEGY & ASCII)
 Processed source-receiver navigation (UKOOA)
 Post stack navigation (UKOOA)
30 January, 2014
NOVA SCOTIA RENAISSANCE PHASE II
Pre-stack Time and Depth Migration
Multi-client 2D Survey; 2518.3 km
DEPTH PROCESSING SEQUENCE
Estimated Completion: 13 December, 2013
 Build Initial Velocity Model
Build initial model from smoothed PSTM velocity field
 Create Data for Model Building Purposes
Input Radon gathers, sum to 40 or 53 fold for Kirchhoff iterations, 14 sec, 4ms
 KIRCHHOFF PSDM: ITERATIONS I & II - Tomography Updates
Kir: Output 25m CMP, 16km depth, 10m step, 40/53fold; Aperture 8000m
Tomography (2-passes) to define sediment velocity model
 KIRCHHOFF PSDM: ITERATION III - Tomography Update
Kir: Output 25m CMP, 40/53fold; 16km depth, 10m step, Aperture 8000m
 KIRCHHOFF PSDM: ITERATION IV - Define Top of Salt
Kir: Output 25m CMP, 40/53fold; 16km depth, 10m step, Aperture 9200m
 RTM & KIRCHHOFF PSDM: ITERATION V - Define Base of Salt
Kir: Output 25m CMP, 40/53fold; 16km depth, 10m step, Aperture 9200m
RTM: Input all shots @ 8ms, Output 25m CMP, 16km, 10m step, 25Hz; Aperture 9200m
 RTM & KIRCHHOFF PSDM: ITERATION VI – Analyze Salt Overhangs
and Iterate (as needed)
 KIRCHHOFF PSDM: ITERATION VII – Subsalt Tomography Update
Kir: Output 25m CMP, 40/53fold; 16km depth, 10m step, Aperture 8000m
Tomography to define final velocity field
 Final Isotropic Reverse Time and Kirchhoff Migrations
Kir: Output 25m CMP, 40/53fold; 16km depth, 5m step, Aperture 9200m
Output: Kirchhoff PSDM gathers with residual NMO
RTM: Input all shots @8ms, Output 12.5m CMP, 16km, 10m step, 30Hz; Aperture 9200m
Output: RTM pre-stack depth migrated - raw
 Stack Kirchhoff
Output: Kirchhoff pre-stack depth migrated - raw
 Post Stack Processing (Filtering, spectral shaping, FK Power, Scaling)
Output: RTM pre-stack depth migrated - processed
Output: Kirchhoff pre-stack depth migrated - processed
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AVAILABLE DEPTH DELIVERABLES
Reverse time migration - raw (12.5m, 16km, 5m depth step)
Reverse time migration - processed (12.5m, 16km, 5m depth step)
Kirchhoff pre-stack depth migrated - raw (12.5m, 16km, 5m depth step)
Kirchhoff pre-stack depth migrated - processed (12.5m, 16km, 5m depth step)
Kirchhoff PSDM gathers with residual NMO (Final – 12.5m, 40/53 fold, 16km, 5m depth step)
Final velocity volume - unsmoothed SEGY (12.5m, 16km, 5m depth step)
Sediment interval velocity field -unsmoothed SEGY (12.5m, 16km, 5m depth step)
Interpreted water bottom horizon (ASCII)
Interpreted top salt horizon (ASCII)
Interpreted base salt horizon (ASCII)
30 January, 2014