Storage

1
Storage Distribution

• Stewart A. Levin

2
Guidelines

• Long term viability
• SEG-EAGE model data still in use after 15 years
• Follow SEAM business model
• Put out RFPs for tender
• Single point of contact for data requests
• Validation, verification, contract compliance

3
Compression

• Preliminary costing highlighted need for about
  101 data reduction to fit in budget
• Either compression or compute many fewer shots
• Lossless compression, e.g. PKZIP, GZIP, achieve
  less than 21 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

4
Compression
1200
1000
800
File Size (MB)
600
400
200
5
orig
6
.01
7
.1
8
1
9
.1
10
1
11
orig
12
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.

13
Storage Vendor

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

14
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 28N88W 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

15
Classic Datasets

• Traces are selected off at QC vendor, shipped to
  Landmark in terabyte subsets
• Once all shot records have been QCed, classic
  datasets will be sorted, compressed, and shipped
  to PetroBank for storage and distribution