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SEG Technical Standards Committee SEG-D Revision 3.0 Proposal.

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Presentation on theme: "SEG Technical Standards Committee SEG-D Revision 3.0 Proposal."— Presentation transcript:

1 SEG Technical Standards Committee SEG-D Revision 3.0 Proposal

2 SEG Field Tape Standards History 1967 SEG-A & SEG-B SEG-C 1972 SEG-D Rev Rev SEG-D, Rev 2.1 SEG Field Tape Standards 2006 Rev

3 The revision was specifically designed as a targeted upgrade to support very high capacity tapes. 3.0 was promised in the 2.1 standard to follow soon afterwards and deal with major overhaul and/or upgrades. The revision was specifically designed as a targeted upgrade to support very high capacity tapes. 3.0 was promised in the 2.1 standard to follow soon afterwards and deal with major overhaul and/or upgrades. Why now?

4 Jill Lewis (Troika International) Earns living transferring & transcribing data Stewart A. Levin (Halliburton Energy Services) ProMAX SEG-D Input support & upgrades Rune Hagelund (WesternGeco) Umpteen years acquisition software experience Barry D. Barrs (ExxonMobil) Navigation and positioning expertise Jill Lewis (Troika International) Earns living transferring & transcribing data Stewart A. Levin (Halliburton Energy Services) ProMAX SEG-D Input support & upgrades Rune Hagelund (WesternGeco) Umpteen years acquisition software experience Barry D. Barrs (ExxonMobil) Navigation and positioning expertise Why us?

5 An explosion in data being stored in vendor- specific headers driven by the need for smooth transfer between acqusition & QC/processing Multicomponent surveys Higher sampling rates/non-power-of-2 ratios Beyond 24-bit sensor sensitivity Continuous passive monitoring Only non-record format is long byte stream cumbersome for QC and transcription An explosion in data being stored in vendor- specific headers driven by the need for smooth transfer between acqusition & QC/processing Multicomponent surveys Higher sampling rates/non-power-of-2 ratios Beyond 24-bit sensor sensitivity Continuous passive monitoring Only non-record format is long byte stream cumbersome for QC and transcription SEG-D issues driving 3.0

6 Nonseismic data? Positioning standards coordination Using web documents for dynamic information –Manufacturer list –Media types and parameters –API organization codes –Guidance recommendations and clarifications –Errata and translations Format validation utilities Nonseismic data? Positioning standards coordination Using web documents for dynamic information –Manufacturer list –Media types and parameters –API organization codes –Guidance recommendations and clarifications –Errata and translations Format validation utilities SEG-D opportunities driving 3.0

7 All features discussed at SEG New Orleans have been implemented –With a few additions SEGD Tape Label, General Header 1 and Demux Trace Header left as is (with a few exceptions) Be an efficient format for transferring information between acquisition and QC/processing –SEGD is not a processing format More space for user-defined header blocks All features discussed at SEG New Orleans have been implemented –With a few additions SEGD Tape Label, General Header 1 and Demux Trace Header left as is (with a few exceptions) Be an efficient format for transferring information between acquisition and QC/processing –SEGD is not a processing format More space for user-defined header blocks Overview of revision 3.0 proposal

8 Increased flexibility –Header blocks tagged to allow shot specific (attached to general header) or trace specific information –Flexible sample rates, header sizes, reclength etc. Increased robustness –Tagged header blocks –Size of shot/data in General Header Simplified encoding/decoding –No complex datatypes, using 4byte float, int etc –Explicit values (ex. #samples/trace) –No dependencies between header blocks Additional functionality Increased flexibility –Header blocks tagged to allow shot specific (attached to general header) or trace specific information –Flexible sample rates, header sizes, reclength etc. Increased robustness –Tagged header blocks –Size of shot/data in General Header Simplified encoding/decoding –No complex datatypes, using 4byte float, int etc –Explicit values (ex. #samples/trace) –No dependencies between header blocks Additional functionality Overview of revision 3.0 proposal

9 Logical numbering of traces/source points extended to handle all operation types –Line number –Point number –Point index –Group index –Depth index –Reshoot index Logical numbering of traces/source points extended to handle all operation types –Line number –Point number –Point index –Group index –Depth index –Reshoot index New features in revision 3.0 proposal

10 Support for complex shooting schemes –Multiple source initiations per shot record –Multiple sources firing simultaneously Support for complex source configurations –Traces and measurements for sources and parts of sources Align SEG-D with SPS standard and/or SEG-Y revision 1 positioning support Support for complex shooting schemes –Multiple source initiations per shot record –Multiple sources firing simultaneously Support for complex source configurations –Traces and measurements for sources and parts of sources Align SEG-D with SPS standard and/or SEG-Y revision 1 positioning support New features in revision 3.0 proposal

11 Standardizing storage of common survey information –Vessel/crew identification –Survey area name –Client identification –Job identification –Line identification (Record set ID) Size of record, data, and header explicit in General Header Standardizing storage of common survey information –Vessel/crew identification –Survey area name –Client identification –Job identification –Line identification (Record set ID) Size of record, data, and header explicit in General Header New features in revision 3.0 proposal

12 Positions can be tagged to all traces/equipment –Multiple positions (in space and time) –Format TBD by pos group Support for multi-component data –Node number, trace grouping, orientation header New General Trailer format –Flexible, allows any data-block to be appended Standardized edits can be appended to General Trailer –Allows easy addition of edits post-acquisition 8068: IEEE 8 byte samples Positions can be tagged to all traces/equipment –Multiple positions (in space and time) –Format TBD by pos group Support for multi-component data –Node number, trace grouping, orientation header New General Trailer format –Flexible, allows any data-block to be appended Standardized edits can be appended to General Trailer –Allows easy addition of edits post-acquisition 8068: IEEE 8 byte samples New features in revision 3.0 proposal

13 Sample rate steps of 1 microsecs No longer a base scan rate –Dominant sample interval used for backwards compatibility Timestamp – counting microsecs since 6 Jan 1980 (GPS epoch) –8 byte integer –Negative timestamps allowed – years range Sample rate steps of 1 microsecs No longer a base scan rate –Dominant sample interval used for backwards compatibility Timestamp – counting microsecs since 6 Jan 1980 (GPS epoch) –8 byte integer –Negative timestamps allowed – years range Sample rate / timestamp

14 All measurements now properly tagged with accurate, absolute timestamp (if available) –Positions, traces, shot, etc. All header sizes extended –More room for acquisition system defined blocks –Existing trace ext hdr blocks may be used.... –...but remember to use correct block tag Standardizing storage of SEGD –One header block spanning multiple tape blocks –A trace spanning multiple tape blocks –Fixed/variable block devices –Disk storage –Transfer across network All measurements now properly tagged with accurate, absolute timestamp (if available) –Positions, traces, shot, etc. All header sizes extended –More room for acquisition system defined blocks –Existing trace ext hdr blocks may be used.... –...but remember to use correct block tag Standardizing storage of SEGD –One header block spanning multiple tape blocks –A trace spanning multiple tape blocks –Fixed/variable block devices –Disk storage –Transfer across network New features in revision 3.0 proposal

15 More sensor types/channel types explicitly supported –Wind, depth, reference signals, source measurements etc. Sensor sensitivity value stored per channel –Convert to actual physical unit –Support non-voltage measurements More sensor types/channel types explicitly supported –Wind, depth, reference signals, source measurements etc. Sensor sensitivity value stored per channel –Convert to actual physical unit –Support non-voltage measurements New features in revision 3.0 proposal

16 Table Of Contents file –Stored at end (or beginning) of tape –Lists all SEGD records on a tape –Enable fast access to data –May be stored on disk (to simplify data mgt) Table Of Contents file –Stored at end (or beginning) of tape –Lists all SEGD records on a tape –Enable fast access to data –May be stored on disk (to simplify data mgt) New features in revision 3.0 proposal

17 Line number -> Record set number –To be usable for all types of operation Only 3 General Header blocks required in rev 3.0 –Everything else optional Line number -> Record set number –To be usable for all types of operation Only 3 General Header blocks required in rev 3.0 –Everything else optional New features in revision 3.0 proposal

18 Channel set header block 96 bytes Header block sizes –General header blocks (2 MB) –Channelset header – blocks (~6MB) –Skew blocks – blocks (~2MB) –Extended header – blocks (~512MB) –External header blocks (~512MB) –Trace Header Extension – 255 blocks (8160 bytes) –General Trailer – blocks (~128GB) Channel set header block 96 bytes Header block sizes –General header blocks (2 MB) –Channelset header – blocks (~6MB) –Skew blocks – blocks (~2MB) –Extended header – blocks (~512MB) –External header blocks (~512MB) –Trace Header Extension – 255 blocks (8160 bytes) –General Trailer – blocks (~128GB) Header size extensions

19 Traces can be 2147 seconds long Negative start times allowed Extended recording mode allows up to 140,735,340 seconds (1628 days) of data to be stored in one record Traces can be 2147 seconds long Negative start times allowed Extended recording mode allows up to 140,735,340 seconds (1628 days) of data to be stored in one record Trace size

20 Extended filter definitions –Frequencies and slopes are IEEE floats (4 bytes) –Filter type –Filter delay Extended filter definitions –Frequencies and slopes are IEEE floats (4 bytes) –Filter type –Filter delay Filters

21 Volunteers always wanted –Were taking names –Multicomponent standards –Downhole acquisition support –Metadata additions (temperature, wave height, …) Opinions too –Were taking notes Volunteers always wanted –Were taking names –Multicomponent standards –Downhole acquisition support –Metadata additions (temperature, wave height, …) Opinions too –Were taking notes Questions, Concerns and Suggestions?


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