75th SEG Houston Technical Standards Committee meeting

75th SEG Houston 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

75th SEG Houston SPS Review

75th SEG Houston SPS X (relational file) relational record specification Itemdefinition of fieldcolsformatmin. to maxdefaultjust. 1record identification 1 – A1 "x" nonen/a record identifier: unchanged. 2field tape number 2 – A2 free noneright field tape number: unchanged *3field record number 8 – I4 I8 0 to to noneright field record number: expanded to i8 to be compatible with SEGD. 4field record increment 12 – I1 1 to 9 1right field record increment: unchanged. 5instrument code 13 – A1 1 to 9 1right instrument code: unchanged. 6line name 14 – A4 F10.2 free to noneleft line name: to be compatible with the SEGD format. 7point number 30 – A4 F10.2 free to noneright point number to be compatible with the SEGD format. 8point index 38 – I1 1 to 9 1right point index: unchanged

75th SEG Houston SPS X (relational file) Cont’d *9from channel 39 – I4 I5 1 to to noneright from channel: format changed from i4 to i5, to handle larger channel counts ( actives channels) *10to channel 43 – I4 I5 1 to to noneright to channel: format changed from i4 to i5, to handle larger channel counts ( actives channels) 11channel increment 47 – I1 1 to 9 1right channel increment: unchanged. 12line name 48 – A4 F10.2 free to noneleft line name: to be compatible with the SEGD format. 13from receiver 64 – A4 F10.2 free to noneright from receiver: to be compatible with the SEGD format. 14to receiver 72 – A4 F10.2 free to noneright to receiver: to be compatible with the SEGD format. 15receiver index I1 1 to 9 1right receiver index: unchanged.

75th SEG Houston SPS S & R (Point file) (source and receiver)point record specification definition of fieldcolsformatmin. to maxdefaultjust.units record identification 1-1 A1 “s” or “r” nonen/a record identification: unchanged. line name A4 F10.2 free to noneleft line number: to be compatible with the SEGD format. point number A4 F10.2 free to noneright point number: to be compatible with the SEGD format. point index26-26I11 to 91right point index: All other fields remain the same

75th SEG Houston SEGD Review

75th SEG Houston 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 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

75th SEG Houston Thank you for your attention