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Validate and store seismic data collected during marine field ops

Guide to Processing and Storing SEGY Seismic Data Collected in Field Operations Bob Courtney Geological Survey of Canada (Atlantic) Bob.courtney@nrcan.gc.ca. Objectives for Field Ops. Validate and store seismic data collected during marine field ops

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Validate and store seismic data collected during marine field ops

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  1. Guide to Processing and Storing SEGY Seismic Data Collected in Field Operations Bob CourtneyGeological Survey of Canada (Atlantic)Bob.courtney@nrcan.gc.ca

  2. Objectives for Field Ops • Validate and store seismic data collected during marine field ops • Scientists should walk off the vessel with seismic data in a highly usable and compressed form • Compressed data should be submitted to on-line archives on return to shore to expand holdings

  3. GSC Implementation of JPEG2000 • GSC has implemented the JPEG2000 framework to consolidate, encode, archive, interpret and disseminate digital SEGY data. • Experience suggests between 10:1 to 40:1 compression effective • Approach applied to seismic, sidescan, and sounder data. Will (?) be extended to image trace data of multibeam sounders (water column imaging), other gridded data sets. • Read more

  4. SEGY  JPEG2000Processing Framework JPEG2000 Viewers GIS Tape Encode Interpret Harvest Archive DVD Register Convert QC Internet Scan

  5. HarvestDemultiplex and Combine File 1 File 2 File n-1 Demultiplex Combine Channels Concatenate Big SEGY >200,000 pings 2 GB File n

  6. HarvestDemultiplex and Combine • Reduce number of files => 1 file/day rather than 50 • Database-linked nomenclature • Composite channel files; sidescan, 2 channel high res • Self descriptive file names • Expedition_datatype_instrument_xdcr_starttime_endtime • 2007006_SEISMIC_KNUDSON_3.5khz_132_0007_to_132_1217.sgy

  7. HarvestDemultiplex and Combine Download most recent copy at : ftp://gsca.nrcan.gc.ca/gsca/courtney/Combine_Segy/CombineSegy.zip Online Help with program and, also, at : ftp://gsca.nrcan.gc.ca/gsca/courtney/Combine_Segy/Combine SEGY Files.htm Remember to remove an older version of the program before you install the most recent version

  8. HarvestDemultiplex and Combine Examples • GSCDIG example • Knudsen Sounder • If only KEB files have been recorded then convert to SEGY using their conversion utility Click to download

  9. EncodeSEGY  SGYJP2

  10. EncodeSEGY  SGYJP2 SEGY.xsd XML to Database GZIP XML SEGY headers Summary data 1:1 10:1 Filter Signal Cond. Outliers Bipolar Envelope Half-wave SEGY SGYJP2 JPEG2000 Compression Engine 10:1 - 40:1 Waveform Data • zero padding trace delays • lossless or lossy • keep only significant bit-depth • choose reduced bit-depth scaled to highest amplitude;

  11. EncodeSEGY  SGYJP2 Download most recent copy at : ftp://gsca.nrcan.gc.ca/gsca/courtney/SegyJp2/SegyJp2.zip Online Help with program and, also, at : ftp://gsca.nrcan.gc.ca/gsca/courtney/SegyJp2/SegyJp2.htm Remember to remove an older version of the program before you install the most recent version

  12. EncodeSEGY  SGYJP2 Examples • GSCDIG example • Knudsen Sounder

  13. InterpretSGYJP2

  14. InterpretSGYJP2 horizons.xsd XML to Database XML Horizons View & Interpret SGYJP2 GZIP XML Markers SGYJP2 XML Sections Shapefiles GIS Automation

  15. InterpretSGYJP2 Download most recent copy at : ftp://gsca.nrcan.gc.ca/gsca/courtney/SegyJp2Viewer/SegyJp2_Viewer.zip Online Help with program and, also, at : ftp://gsca.nrcan.gc.ca/gsca/courtney/SegyJp2Viewer/SegyJp2 Viewer.htm Sample Data Sets at: ftp://gsca.nrcan.gc.ca/gsca/courtney/Sample%20Data/ Remember to remove an older version of the program before you install the most recent version

  16. Ongoing EffortsSGYJP2 • Shapefiles and ESRI automation • Google Earth KMZ • Drivers for Klein digital formats • GSF, XTF encoding ( XML schemas)

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