2 Committee ObjectivesResponsible for designing acquisition strategies for simulated seismic datasets and for integration between all Technical Committees.Technical exchangeTestingDesign recommendationsDataset recommendations
9 Acquisition Parameter Frequency max <= 30Hzmin >= 1HzSource – receiver offset +/- 9.9 kmMigration ½ aperture 10 kmCalculation aperture 30 km (+/- 15km offset from CMP/CDP)Record length 16 secondsSample interval 8 msReceiver interval 30 m gridShot Spacing m gridShot area whole model 35 x 40 kmSource and receiver depth 15 mRecording grid dimensions 19,800 meters x 19,800 metersNumber of recorded channels 661 x 661 = 436,921Fold inline x 66 xline = 4,356
10 Classic Datasets Objectives: Easily accessible datasets Compact but completeDatasets that will be standards for analysis by many investigatorsAllow for a wide range of investigationsWide azimuth imaging testsWide azimuth processing and acquisition tests and developmentVarious WAZ designs presently being usedWAZ vs NAZGeneral 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 velocity9*267 shots ~ 17 TB uncompressed; 150 m shot spacingNine NS shot lines across center of model; absorbing upper surface; pressure vertical component of velocityFull azimuth sparse 3D shot coverage2793 shots; 600 m spacing; approved; ~10 TB uncompressed4 Wide-Azimuth datasets extracted from full surveyWide azimuth NS push-pull~4.1 TB uncompressedWide azimuth NS interleaf; pull only~1.7 TB uncompressedWide azimuth EW push-pullWide azimuth EW interleaf pull only4 Narrow-Azimuth datasets extracted from Full surveyNarrow Azimuth NS push-pull~1.2 TB uncompressedNarrow Azimuth NS pull~0.5 TB uncompressedNarrow azimuth EW push-pullNarrow azimuth EW pull
12 Acquisition Examples Full Azimuth Sparse 3D dataset Shot spacing X: 600 mY: 600 mStart XY(3025,3050)End XY(31825,36650)All receivers(57 shots)(49 shots)
13 Acquisition Examples Wide Azimuth NS Push-Pull dataset Shot spacing X: 600 mY: 150 mStart XY(3025,3050)End XY(31825,37100)Receivers70 cables120 m separation30 m group interval11172 total shots46270 traces/shot (max)
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