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