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SEG Technical Standards Committee Energistics Western Europe Region & SIG Meeting 17 jun 2008 SEG Technical Standards Committee Energistics Western Europe.

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Presentation on theme: "SEG Technical Standards Committee Energistics Western Europe Region & SIG Meeting 17 jun 2008 SEG Technical Standards Committee Energistics Western Europe."— Presentation transcript:

1 SEG Technical Standards Committee Energistics Western Europe Region & SIG Meeting 17 jun 2008 SEG Technical Standards Committee Energistics Western Europe Region & SIG Meeting 17 jun 2008 SEG-D Revision 3.0 Draft

2 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?

3 Jill Lewis (Troika International) — Earns living transferring & transcribing data Stewart A. Levin (Halliburton Energy Services) — ProMAX™ SEG-D Input support & upgrades Rune Hagelund (WesternGeco) — Data acquisition and tape management software for WesternGeco field operations 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) — Data acquisition and tape management software for WesternGeco field operations Barry D. Barrs (ExxonMobil) — Navigation and positioning expertise Why us?

4 An explosion in data being stored in vendor- specific headers driven by the need for smooth transfer between acquisition & 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 acquisition & 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

5 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

6 All features presented at SEG San Antonio/EAGE London 2007 have been implemented –With a few additions (Source Auxiliary Channel Ref) 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 presented at SEG San Antonio/EAGE London 2007 have been implemented –With a few additions (Source Auxiliary Channel Ref) 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

7 Increased flexibility –Header blocks tagged to allow shot specific (attached to general header) or trace specific information –Block type written in byte 32 of all header blocks –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 –Block type written in byte 32 of all header blocks –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

8 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 8080: 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 8080: IEEE 8 byte samples New features in revision 3.0 proposal

9 All measurements now properly tagged with accurate, absolute timestamp (if available)‏ –Positions, traces, shot, etc. –Allows multiple measurements of same type 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 (byte 32) All measurements now properly tagged with accurate, absolute timestamp (if available)‏ –Positions, traces, shot, etc. –Allows multiple measurements of same type 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 (byte 32) 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 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

13 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 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

14 Questions? More details regarding the proposal follows this slide Questions? More details regarding the proposal follows this slide Thank you for the attention

15 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

16 Sample rate steps of 1 microsecs No longer a base scan rate –“Dominant sample interval” used for backwards compatibility Samplerate chosen over frequency Backwards compatibility Ability to relate sample to point in time (timestamp) Sample rate steps of 1 microsecs No longer a base scan rate –“Dominant sample interval” used for backwards compatibility Samplerate chosen over frequency Backwards compatibility Ability to relate sample to point in time (timestamp) Sample rate

17 Counting microsecs since 6 Jan 1980 (GPS epoch)‏ –8 byte integer –Negative timestamps allowed – years range –Defined back to 1 jan 1970 (SEG-D epoch) –Leap seconds must be added to UTC timestamp (General Header) Counting microsecs since 6 Jan 1980 (GPS epoch)‏ –8 byte integer –Negative timestamps allowed – years range –Defined back to 1 jan 1970 (SEG-D epoch) –Leap seconds must be added to UTC timestamp (General Header) Timestamp

18 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

19 Line number -> Record set number –To be usable for all types of operation Only 3 General Header blocks (#1-3) required in rev 3.0 –Everything else optional –Allows meta-data records (no traces) –Allows zero length traces (only trace header) –Allows trailer only records Line number -> Record set number –To be usable for all types of operation Only 3 General Header blocks (#1-3) required in rev 3.0 –Everything else optional –Allows meta-data records (no traces) –Allows zero length traces (only trace header) –Allows trailer only records New features in revision 3.0 proposal

20 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

21 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

22 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

23 Definition not completed yet (work in progress) “Placeholders” defined Projection/datum information part of General Header Only one projection allowed per SEG-D record Positions part of Trace Header or General Header (sources) SEG-D position will be binary Definition not completed yet (work in progress) “Placeholders” defined Projection/datum information part of General Header Only one projection allowed per SEG-D record Positions part of Trace Header or General Header (sources) SEG-D position will be binary Positions

24 Update Introduction chapter List of Rev 3.0 changes not complete 4 figures in chapter 3 not updated (Record format and block layout on tapes) TOC file Record description requires proper definition Several lists needs completion (Channel types, Soil types, Sensor types, Physical units, etc.) Appendix A (Manufacturer list) and C (API Producer code) not updated Delete Appendix D (Header descriptors)? Appendix E (Examples) not yet completed Some questions/topics for discussion listed in red. All header blocks and Rev 3 concepts completed. Update Introduction chapter List of Rev 3.0 changes not complete 4 figures in chapter 3 not updated (Record format and block layout on tapes) TOC file Record description requires proper definition Several lists needs completion (Channel types, Soil types, Sensor types, Physical units, etc.) Appendix A (Manufacturer list) and C (API Producer code) not updated Delete Appendix D (Header descriptors)? Appendix E (Examples) not yet completed Some questions/topics for discussion listed in red. All header blocks and Rev 3 concepts completed. Missing from draft

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


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