Storage & Distribution

Stewart A. Levin

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

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

Compression

0

200000000

400000000

600000000

800000000

1000000000

1200000000

raw

gzi

p -

9

los

sy .

01%

los

sy .

1%

los

sy 1

%

los

sy 1

0%

1200

1000

800

600

400

200

FileSize(MB)

orig

.01%

.1%

1%

.1%

1%

orig

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.

Storage Vendor

• PetroBank (Landmark)– No, I was not involved in the selection.

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

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