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Acquisition and Design Committee Chuck Meeder - Co-Chair Adam Seitchik - Co-Chair Tim Brice Robert Bloor Roger Sollie Laurent Lemaistre Nick Moldoveanu.

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Presentation on theme: "Acquisition and Design Committee Chuck Meeder - Co-Chair Adam Seitchik - Co-Chair Tim Brice Robert Bloor Roger Sollie Laurent Lemaistre Nick Moldoveanu."— Presentation transcript:

1 Acquisition and Design Committee Chuck Meeder - Co-Chair Adam Seitchik - Co-Chair Tim Brice Robert Bloor Roger Sollie Laurent Lemaistre Nick Moldoveanu

2 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

3 Model with Salt 3D View 40 km 35km 12 34

4 Testing Exploding Reflector from Oligocene – 3D view 12 34

5 Testing Basement Target Max Travel Time -20 km 0 offset km 0 offset 20 km 12 s 16.7 s 9 s 16.2 s 14.7 s 11 s 20 s 14 s 16 s 18 s 12 34

6 Testing Migration Aperture - Top Oligocene

7 Testing Different shooting directions selected from a 150 m x 150 m source grid

8 Basic recording patch 40 km 35km

9 Acquisition Parameter Frequencymax <= 30Hz min >= 1Hz Source – receiver offset+/- 9.9 km Migration ½ aperture10 km Calculation aperture30 km (+/- 15km offset from CMP/CDP) Record length16 seconds Sample interval8 ms Receiver interval30 m grid Shot Spacing150 m grid Shot areawhole model 35 x 40 km Source and receiver depth15 m Recording grid dimensions19,800 meters x 19,800 meters Number of recorded channels661 x 661 = 436,921 Fold66 inline x 66 xline = 4,356

10 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

11 Classic Datasets 3 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

12 Acquisition Examples Shot spacing X: 600 m Y: 600 m Start XY (3025,3050) End XY (31825,36650) All receivers (49 shots) (57 shots) Full Azimuth Sparse 3D dataset

13 Acquisition Examples Shot spacing X: 600 m Y: 150 m Start XY (3025,3050) End XY (31825,37100) Receivers 70 cables 120 m separation 30 m group interval total shots traces/shot (max) Wide Azimuth NS Push-Pull dataset

14 Status


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