Guide to Processing and Storing SEGY Seismic Data

Guide to Processing and Storing SEGY Seismic Data Collected in Field Operations Bob Courtney Geological 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 JPEG 2000 § GSC has implemented the JPEG 2000 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 JPEG 2000 Processing Framework JPEG 2000 Viewers Tape Harvest Encode Convert QC Register Interpret GIS Archive DVD Scan Internet

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

Harvest 6 Demultiplex 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. 5 khz_132_0007_to_132_1217. sgy

7 Harvest Demultiplex and Combine Download most recent copy at : ftp: //gsca. nrcan. gc. ca/gsca/courtney/Combine_Segy/Combine. Segy. 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 Harvest Demultiplex 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 Encode SEGY SGYJP 2

Encode 10 SEGY SGYJP 2 XML to Database SEGY. xsd XML 1: 1 SEGY headers Summary data SEGY Filter Signal Cond. Outliers GZIP Bipolar Envelope Half-wave - zero padding trace delays - lossless or lossy 10: 1 SGYJP 2 Waveform Data - keep only significant bit-depth - choose reduced bit-depth scaled to highest amplitude; JPEG 2000 Compression Engine 10: 1 - 40: 1

11 Encode SEGY SGYJP 2 Download most recent copy at : ftp: //gsca. nrcan. gc. ca/gsca/courtney/Segy. Jp 2. zip Online Help with program and, also, at : ftp: //gsca. nrcan. gc. ca/gsca/courtney/Segy. Jp 2. htm Remember to remove an older version of the program before you install the most recent version

Encode 12 SEGY SGYJP 2 Examples § GSCDIG example § Knudsen Sounder

13 Interpret SGYJP 2

Interpret 14 SGYJP 2 horizons. xsd XML to Database XML Horizons SGYJP 2 View & Interpret XML Markers GZIP SGYJP 2 Automation Shapefiles GIS XML Sections

Interpret 15 SGYJP 2 Download most recent copy at : ftp: //gsca. nrcan. gc. ca/gsca/courtney/Segy. Jp 2 Viewer/Segy. Jp 2_Viewer. zip Online Help with program and, also, at : ftp: //gsca. nrcan. gc. ca/gsca/courtney/Segy. Jp 2 Viewer/Segy. Jp 2 Viewer. htm Sample Data Sets at: ftp: //gsca. nrcan. gc. ca/gsca/courtney/Sample%20 Data/ Remember to remove an older version of the program before you install the most recent version

16 Ongoing Efforts SGYJP 2 • Shapefiles and ESRI automation • Google Earth KMZ • Drivers for Klein digital formats • GSF, XTF encoding ( XML schemas)