This document describes a multi-client 2D seismic survey conducted off the coast of Nova Scotia, Canada. It details the acquisition parameters, processing workflows, and available deliverables for both time and depth processing of the 2518.3 km survey. Time processing included velocity analysis, multiple attenuation, migration, stacking, and filtering to produce processed time migrations. Depth processing utilized iterative velocity model building, Kirchhoff pre-stack depth migration, and reverse time migration to produce processed depth volume images of the subsurface geology including sediment, salt, and subsalt structures.

1. Canada
56°W
SPM
58°W
58°W
60°W
60°W
62°W
62°W
64°W
64°W
66°W
66°W
46°N
46°N
44°N
44°N
42°N
42°N
40°N
38°N 40°N
NOVA SCOTIA RENAISSANCE PHASE II
MULTI-CLIENT 2D SEISMIC SURVEY
0 20 40 80 120 160
Kilometers
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Nova Scotia Renaissance Phase II
Existing Nova Scotia Renaissance and Bible

2. NOVA SCOTIA RENAISSANCE PHASE II
Pre-stack Time and Depth Migration
Multi-client 2D Survey; 2518.3 km
ACQUISITION PARAMETERS
Survey/Acquisition Date: NS-100 July -Oct 1998 NS-100 May - Oct 1999
Data Acquired By: Geco-Prakla Geco-Prakla
Recording Instrument: Nessie 3 Nessie 3
Airgun Source: 7918 cubic inches 7918 cubic inches
Gun Depth: 7.5 meters +/-1 meter 7.5 meters +/-1 meter
Shotpoint Interval: 37.5 meters 37.5 meters
Group Interval: 25 meters 25 meters
Recording Channels: 240 320
Streamer Depth: 9 meters +/-1.5 meters 9 meters +/-1.5 meters
Streamer Length: 6000 meters 8000 meters
Record Length: 14.336 seconds 14.336 seconds
Sample Interval: 2 milliseconds 2 milliseconds
Nominal Fold: 80 106
TIME PROCESSING SEQUENCE
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

3. 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
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