Acquisition and Design CommitteeChuck Meeder - Co-Chair
Adam Seitchik - Co-Chair
Tim Brice
Robert Bloor
Roger Sollie
Laurent Lemaistre
Nick Moldoveanu
Committee Objectives
• Responsible for designing acquisition strategies for simulated seismic datasets and for integration between all Technical Committees. – Technical exchange
– Testing
– Design recommendations
– Dataset recommendations
Model with Salt
3D View
40
km
35km
1 2
3 4
TestingExploding Reflector from Oligocene – 3D view
1 2
3 4
TestingBasement Target Max Travel Time
-20 km 0 offset 20
-20
km
0
offs
et
2
0 km
12 s
16.7 s
9 s
16.2 s
14.7 s
11 s
20 s
14 s
16 s
18 s
1 2
3 4
TestingMigration Aperture - Top Oligocene
TestingDifferent shooting directions selected from a 150 m x 150 m source grid
Basic recording patch4
0 km
35km
Acquisition Parameter • Frequency max <= 30Hz
min >= 1Hz• Source – receiver offset +/- 9.9 km • Migration ½ aperture 10 km• Calculation aperture 30 km (+/- 15km offset from CMP/CDP)• Record length 16 seconds• Sample interval 8 ms• Receiver interval 30 m grid• Shot Spacing 150 m grid• Shot area whole model 35 x 40 km• Source and receiver depth 15 m
• Recording grid dimensions 19,800 meters x 19,800 meters• Number of recorded channels 661 x 661 = 436,921• Fold 66 inline x 66 xline = 4,356
Classic Datasets
• Objectives:– Easily accessible datasets
• Compact but complete
– Datasets that will be standards for analysis by many investigators
– Allow for a wide range of investigations
– Wide azimuth imaging tests
– Wide azimuth processing and acquisition tests and development
• Various WAZ designs presently being used
• WAZ vs NAZ
– General processing and imaging with quality numerical data
Classic Datasets3 Classic datasets with all receivers
• Nine NS shot lines across center of model; pressure and vertical component of velocity
– 9*267 shots ~ 17 TB uncompressed; 150 m shot spacing
• Nine NS shot lines across center of model; absorbing upper surface; pressure vertical component of velocity
– 9*267 shots ~ 17 TB uncompressed; 150 m shot spacing
• Full azimuth sparse 3D shot coverage
– 2793 shots; 600 m spacing; approved; ~10 TB uncompressed
4 Wide-Azimuth datasets extracted from full survey
• Wide azimuth NS push-pull– ~4.1 TB uncompressed
• Wide azimuth NS interleaf; pull only
– ~1.7 TB uncompressed
• Wide azimuth EW push-pull– ~4.1 TB uncompressed
• Wide azimuth EW interleaf pull only
– ~1.7 TB uncompressed
4 Narrow-Azimuth datasets extracted from Full survey
• Narrow Azimuth NS push-pull
– ~1.2 TB uncompressed
• Narrow Azimuth NS pull– ~0.5 TB uncompressed
• Narrow azimuth EW push-pull
– ~1.2 TB uncompressed
• Narrow azimuth EW pull– ~0.5 TB uncompressed
Acquisition Examples
Shot spacingX: 600 mY: 600 m
Start XY(3025,3050)
End XY(31825,36650)
All receivers
(49 shots)
(57
shot
s)
Full Azimuth Sparse 3D dataset
Acquisition Examples
Shot spacingX: 600 mY: 150 m
Start XY(3025,3050)
End XY(31825,37100)
Receivers70 cables
120 m separation30 m group interval
11172 total shots46270 traces/shot (max)
Wide Azimuth NS Push-Pull dataset
Status