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Technical Standards Committee meeting

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  1. Technical Standards Committee meeting

  2. SEGD & SPS Revision Goals • Establish consistency between SEGD and SPS • Source line and source point numbers • Receiver line and receiver point numbers • File numbers • Handle “large” file numbers • Handle “large” channel counts consistent with modern recording systems • Maintain 80 column format of current SPS • Maintain limited backwards compatibility

  3. SPS Review

  4. SPS X (relational file) relational record specification Item definition of field cols format min. to max default just. 1 record identification 1 – 1 1 - 1 A1 A1 "x" "x" none n/a record identifier: unchanged. 2 field tape number 2 – 7 2 - 7 3A2 3A2 free free none right field tape number: unchanged *3 field record number 8 – 11 8 - 15 I4 I8 0 to 9999 0 to 16777216 none right field record number: expanded to i8 to be compatible with SEGD. 4 field record increment 12 – 12 16 - 16 I1 I1 1 to 9 1 to 9 1 right field record increment: unchanged. 5 instrument code 13 – 13 17 - 17 A1 A1 1 to 9 1 to 9 1 right instrument code: unchanged. 6 line name 14 – 29 18 - 27 4A4 F10.2 free -999999.99 to 9999999.99 none left line name: to be compatible with the SEGD format. 7 point number 30 – 37 28 - 37 2A4 F10.2 free -999999.99 to 9999999.99 none right point number to be compatible with the SEGD format. 8 point index 38 – 38 38 - 38 I1 I1 1 to 9 1 to 9 1 right point index: unchanged

  5. SPS X (relational file) Cont’d *9 from channel 39 – 42 39 - 43 I4 I5 1 to 9999 1 to 99999 none right from channel: format changed from i4 to i5, to handle larger channel counts (100000 actives channels) *10 to channel 43 – 46 44 - 48 I4 I5 1 to 9999 1 to 99999 none right to channel: format changed from i4 to i5, to handle larger channel counts (100000 actives channels) 11 channel increment 47 – 47 49 - 49 I1 I1 1 to 9 1 to 9 1 right channel increment: unchanged. 12 line name 48 – 63 50 - 59 4A4 F10.2 free -999999.99 to 9999999.99 none left line name: to be compatible with the SEGD format. 13 from receiver 64 – 71 60 - 69 2A4 F10.2 free -999999.99 to 9999999.99 none right from receiver: to be compatible with the SEGD format. 14 to receiver 72 – 79 70 - 79 2A4 F10.2 free -999999.99 to 9999999.99 none right to receiver: to be compatible with the SEGD format. 15 receiver index 80 -80 80 - 80 I1 I1 1 to 9 1 to 9 1 right receiver index: unchanged.

  6. SPS S & R (Point file) definition of field cols format min. to max default just. units record identification 1-1 1-1 A1 A1 “s” or “r” “s” or “r” none n/a record identification: unchanged. line name 2-17 2-11 4A4 F10.2 free -999999.99 to 9999999.99 none left line number: to be compatible with the SEGD format. point number 18-25 12-21 2A4 F10.2 free -999999.99 to 9999999.99 none right point number: to be compatible with the SEGD format. point index 26-26 I1 1 to 9 1 right point index: (source and receiver)point record specification All other fields remain the same

  7. SEGD Review

  8. SEGD Review • File number Use of the extended file number currently available should suffice until SEG-E 1 – 16,777,216 • Channel number Use multiple channel sets - 9999 channels per set • X,Y,Z and T and flag To permit the recording of individual vibrator locations for individual sweeps for HFVS and similar vibrator operations.Since the recorded vibrator signals (BP, RM & GF) will be recorded in the auxiliary channels we propose recording the position information in the aux channel headers. The flag (pre-plan, surveyed, actual…..) can also be recorded in the header. • Uphole time Should be recorded in the auxiliary channel header that corresponds to the recorded uphole signal (0 – 99ms to be consistent with SPS) • General Header Needs to include all topographical survey information required for correct positioning: datums, map projections, transformations, etc … Or .. Use reference to database from PetroConsultants http://www.remotesensing.org/geotiff/proj_list/guid7.html

  9. Thank you for your attention