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Storage & Distribution
Stewart A. Levin
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Guidelines
• Long term viability– SEG-EAGE model data still in use after 15 years
• Follow SEAM business model– Put out RFP’s for tender
• Single point of contact for data requests– Validation, verification, contract compliance
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Compression
• Preliminary costing highlighted need for about 10:1 data reduction to fit in budget– Either compression or compute many fewer shots
• Lossless compression, e.g. PKZIP, GZIP, achieve less than 2:1 on test records
• Landmark offer of free perpetual license for their corporate standard compression– Dave Hale patent 6,1690,919
– JPEG family with C1 continuity
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Compression
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FileSize(MB)
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orig
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.01%
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.1%
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1%
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.1%
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1%
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orig
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Compression Software
• Library provided under license agreeing to use it only for SEAM data
• Free, unrestricted C source code driver software provided for decompression of SEAM data back to SEG-Y
• Available for Linux, Solaris, Windows, IRIX, and Apple. Other platforms on request.
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Storage Vendor
• PetroBank (Landmark)– No, I was not involved in the selection.
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SEG-Y Rev. 1 & P1/90
• Datasets generated with SEG-Y Revision 1 compatible reel and trace headers
• P1/90 created by compression code to position coordinate origin at 28°N–88°W and describe the 4 corners of coverage for each shot record– UTM Zone 16 N, NAD83 datum, WGS84 projection
– Standalone P1/90 trace header scanner available
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Classic Datasets
• Traces are selected off at QC vendor, shipped to Landmark in ~terabyte subsets
• Once all shot records have been QC’ed, classic datasets will be sorted, compressed, and shipped to PetroBank for storage and distribution