                              
                              
                              
     U.S. DEPARTMENT OF ENERGY / U.S. GEOLOGICAL SURVEY
                              
                              
                              
                              
                              
                              
                              
                              
                 U.S. Department of Energy
            Morgantown Energy Technology Center
           Deep Seismic Reflection Studies in the
                   Pacific Northwest U.S.
                              
                              
                 SEG-Y Format Seismic Data
                              
                              
                   A Guide to the CD-ROM
                              
                              
                              
                              
                              
                              
                              
                              
                              
                              
                              
This report is preliminary and has not been reviewed for
conformity with U.S Geological Survey editorial standards
and stratigraphic nomenclature.  Any use of trade names is
for descriptive purposes only and does not imply endorsement
by the U.S. Geological Survey.


                            1992
                              
                              
                          CONTENTS


Introduction.........................................1
Project overview.....................................1
Summary of disc contents.............................2
     Seismic data....................................3
     Field recording / processing parameters.........3
     Location data...................................3
     Velocity data...................................4
     Software........................................4
     Documentation...................................5
Disc directory structure.............................5
DOS system requirements..............................6
Macintosh system requirements........................6
Getting started - DOS systems........................6
Getting started - Macintosh systems..................7
Disclaimer...........................................8
Appendix 1 - Seismic data on disc....................9
Appendix 2 - Location information on disc...........10
Appendix 3 - Field recording / processing information10
Appendix 4 - Velocity information on disc...........11
Appendix 5 - Documentation available on disc........12
                          INTRODUCTION

   This CD-ROM contains SEG-Y format seismic data collected from
southern Washington state, text files of location and velocity
information, display software for DOS and Macintosh personal
computers as well as some source code which may be compiled on
UNIX systems, and all necessary documentation.

   This CD-ROM has been produced in accordance with both the ISO
9660 and Macintosh HFS standards.  The data and text files are
capable of being read by any platform having CD-ROM driver
software supporting either of those standards.  The display
software provided is designed for use under DOS on IBM or
compatible personal computers (PC's) or the Apple Macintosh
family.


                        PROJECT OVERVIEW

     From its inception in May of 1982, the U.S. Department of
Energy Deep Source Gas project has investigated the possibility
that significant quantities of hydrocarbons, natural gas in
particular, may be generated during and following convergent
plate tectonic sediment subduction.  Sediment subduction is
believed to have been an important process during the past 180
million years along the western margin of North America.  Several
years of regional geological, and limited geochemical
investigations led to the theory that some portion of these
subducted sedimentary units may have been left in place in the
upper crust of the continental plate margin of this region.  The
potential for these, in part, deeply buried rocks to generate
petroleum, and to contain important quantities of natural gas at
drillable depths, was at the heart of this effort.  Along with
Gas Hydrates, the Deep Source Gas program of the Morgantown
Energy Technology Center was structured under the heading of
Speculative Gas Resources being investigated in frontier areas of
the U.S.

     Following an initial reconnaissance geophysical effort in
the Pacific Northwest and Alaska, which included the use of
magnetotellurics (MT), gravity, and magnetics information, an
important high conductivity MT anomaly was identified in
southwest Washington.  This feature later identified as the
Southern Washington Cascades Conductor, or SWCC, was of
sufficient areal extent to warrant further study for its
potential as a deeply buried subduction system with significant
sedimentary section.  Approximately 238 kilometers of 1024
channel deep seismic reflection data were collected in 1988, 1989
and 1990 across the SWCC anomaly in six seismic lines.  At this
time approximately half of the data has been analyzed and
released in the following publications:  U.S. Geological Survey,
Open File Report 91-119 entitled "Are Hydrocarbon Source Rocks
Hidden Beneath the Volcanic Flows in the Southern Washington
Cascades?" by W. D. Stanley, W. J. Gwilliam, G. V. Latham, and J.

                                                              1

K. Westhusing, 41 p., 12 figs.;  American Association of
Petroleum Geologists 1990 Annual Convention, San Francisco,
abstract entitled "Deep Seismic Surveys of a Dormant Subduction
Zone in the Pacific Northwest United States", by W. J. Gwilliam,
W. D. Stanley, G. V. Latham and J. K. Westhusing;  U.S.
Department of Energy, Morgantown Energy Technology Center
Proceedings of the 1990 Natural Gas Research and Development
Contractors Review Meeting, entitled "Exploration For Deep Source
Hydrocarbons in Subduction Terrain of the Pacific Northwest" by
Keith Westhusing and Steve Krehbiel, 22 p. 18 figs., available
through the National Technical Information Service (NTIS)
Publication No.DE9100203035;  U.S. Department of Energy
Morgantown Energy Technology Center Proceedings of the 1992
Natural Gas Research and Development Contractors Review Meeting,
abstract, entitled "Deep Source Gas Seismic Survey - Washington
State" by Steven C. Krehbiel, Mary Rafalowski-Guide and Mark H.
Thomas, available through NTIS Publication No. DE92001278;
American Association of Petroleum Geologists Bulletin vol. 76,
no. 10, October 1992 paper entitled "The Southern Washington
Cascades Conductor-A Previously Unrecognized Thick Sedimentary
Sequence?" by W. D. Stanley, W. J. Gwilliam, Gary Latham, and
Keith Westhusing, 16 p., 11 figs.


                    SUMMARY OF DISC CONTENTS

   This disc contains the processed data for 7 seismic lines from
southern Washington state stored in SEG-Y disk-image format.
Also included are text files of field recording/processing
information, location information, and velocity information as
well as the source and executable code for the display programs.
A summary of the disc contents is provided below.


                          SEISMIC DATA

   Final stack and migration data in SEG-Y format for the 7
seismic lines in the study, for a total of 14 data files
consisting of 305,255,588 bytes of data.  A listing of seismic
data included on this disc is provided in Appendix 1.


                RECORDING / PROCESSING PARAMETERS

   Field recording and processing parameters for each SEG-Y
seismic data file, taken from the "side panel" from the original
paper sections, are included in .SPN text files.  A listing of
the .SPN files is provided in Appendix 2.


                          LOCATION DATA




                                                              2

   Shot point and CDP location data for the seismic lines in the
data set are given in .SPT and .CDP text files.  Each file
contains location records having the following format:

   SPT data:
   <line ID> <spt number> <UTM x> <UTM y> <longitude> <latitude>
   
   CDP data:
   <line ID> <CDP number> <UTM x> <UTM y> <longitude> <latitude>
   
   where:
     * <UTM x> and <UTM y> are the UTM x and y values.
     * <longitude> and <latitude> are given in decimal degrees.

   Lines 1E and 1W do not have CDP location files.

   A listing of the location data files included in this disc is
provided in Appendix 3.





































                                                              3

                          VELOCITY DATA

   Velocity data for the seismic lines in the data set are given
in .VEL text files.  Velocity data files L1_2FIN.VEL,
L1_2MIG.VEL, L1EFIN.VEL, L1EMIG.VEL, L1WFIN.VEL and L1WMIG.VEL
have the following record format:

   CDP <cdp number>
   <time> <RMS velocity>
   .
   .
   <time> <RMS velocity>

   All other .VEL files have the following record format:

   CDP <cdp number>
   <time> <RMS velocity> <interval velocity> <depth>
   .
   .
   <time> <RMS velocity> <interval velocity> <depth>

where
   * time is in milliseconds.
   * velocity is in meters/second.
   * depth is in meters.

   A listing of the velocity data files included on this disc is
provided in Appendix 4.


                            SOFTWARE
                                    
   The following software is included on this disc:

   * PLOTSEGY:  A DOS program for displaying SEG-Y seismic data.
   
   * TRACEPLOT: A Macintosh program for displaying SEG-Y seismic
                data.
   
   * DUMPSEGY:  A DOS utility for examining SEG-Y seismic data
                files.
   
   
                          DOCUMENTATION
                                    
   Documentation is provided for all data and software provided
on this disc, as well as references, acknowledgments, and general
information.  A listing of documentation available on this disc
is provided in Appendix 5.


                    DISC DIRECTORY STRUCTURE

\DOCS:              Documentation subdirectory.

                                                              4


\LOC:               contains text files of shot point (.SPT) and
                    CDP (.CDP) location data for all seismic
                    lines on this disc.

\SPN:               contains text files of field recording and
                    processing parameters (.SPN) for all seismic
                    data on this disc.

\SEGY:              contains the SEG-Y seismic data files.  The
                    display programs PLOTSEGY.EXE and TRACEPLOT,
                    and the SEG-Y utility DUMPSEGY.EXE are also
                    included in this directory.

\SOFTWARE:          contains the seismic data display and utility
                    software in the following subdirectories:

\SOFTWARE\EXE:      contains the executable images for PLOTSEGY,
                    DUMPSEGY and TRACEPLOT.

\SOFTWARE\SOURCE:   contains the source code for PLOTSEGY and
                    DUMPSEGY.

\VEL:               contains all the text files of available
                    velocity data (.VEL) for the seismic data on
                    this disc.





























                                                              5

                 MINIMUM DOS SYSTEM REQUIREMENTS

   The minimum DOS system requirements to use the data and
display software are as follows:

     * IBM or compatible personal computer, preferably having an
       80386 or higher numbered processor
     * 640 kb RAM
     * MS- or PC-DOS version 3.1 or later
     * Microsoft MSCDEX version 2.1 or later
     * CD-ROM drive with ISO 9660 software driver
     * EGA/VGA graphics system
                                
                                
              MINIMUM MACINTOSH SYSTEM REQUIREMENTS

   There are four versions of the Macintosh SEG-Y display program
TRACEPLOT provided, each with specific hardware requirements
described below:

     * Traceplot-bw:  This version plots should work on all
      Macintosh's including those with only monochrome screens
      (black and white).  The background of the screen is set to
      white and the foreground is set to black.
     
     * Traceplot:  This version should work on all Macintosh's
      that have a color screen.
     
     * Traceplot-68020:  This version is the same as #2 above,
      except that it will run faster if the machine has a 68020
      processing chip.  It will also run on machines that do not
      have a 68020 chip.
     
     * Traceplot-68881:  This version is the same as #3 above,
      except that  a 68881 math coprocessor chip MUST be present
      in order for the program to run and thus the program will
      execute faster than the other versions.

IMPORTANT: All Macintosh software MUST be copied to the user's
system before it may be run.  It CAN NOT be run directly from the
CD-ROM.


                  GETTING STARTED - DOS SYSTEMS

  PLOTSEGY is a DOS display program allowing the user to review
the actual SEG-Y data and obtain hard copy using the DOS Print
Screen function.  PLOTSEGY uses the SEG-Y data files found in the
SEGY subdirectory.  In order to run PLOTSEGY, change directory to
the SEGY subdirectory and type PLOTSEGY.  Please see PLOTSEGY.TXT
in the DOCS subdirectory.

  DUMPSEGY is a DOS seismic data utility allowing the user to
examine all the components of the SEG-Y data files: the EBCDIC

                                                              6

and binary headers, the individual data trace headers, and the
hexadecimal SEG-Y samples composing a data trace.  Additionally,
DUMPSEGY will translate the SEG-Y samples into their actual
floating point values.  In order to run DUMPSEGY, change
directory to the SEGY subdirectory and type DUMPSEGY.  This will
display a usage screen informing the user how to use the program.
The source code for DUMPSEGY is provided under the SOURCE
subdirectory and may be compiled to run on UNIX platforms using
compilers supporting ANSI C.  Please see DUMPSEGY.TXT in the DOCS
subdirectory.


               GETTING STARTED - MACINTOSH SYSTEMS

  TRACEPLOT, a Macintosh seismic display program prototype, has
been included on this disc allowing the display of the SEG-Y data
on Macintosh computer systems.  In order to run TRACEPLOT, copy
the desired version from the SOFTWARE/EXE directory to a folder
on the Macintosh and click on the TRACEPLOT icon.  IMPORTANT: All
Macintosh software MUST be copied to the user's system before it
may be run.  It CAN NOT be run directly from the CD-ROM.

  As TRACEPLOT is still under development, no source code is
available at this time.  Interested users may contact the author
at the address/phone number given in TRACEPLOT's startup screen.






























                                                              7

                           DISCLAIMER

   This Compact Disc-Read Only Memory (CD-ROM) publication was
prepared by an agency of the United States Government.  Neither
the United States Government nor any agency thereof, nor any of
their employees, make any warranty, expressed or implied, or
assumes any legal liability or responsibility for the accuracy,
completeness, or usefulness of the information, apparatus,
product, or process disclosed in this report, or represents that
its use would not infringe privately owned rights.  Reference
therein to any specific commercial product, process, or service
by trade name, trademark, manufacturer, or otherwise does not
necessarily constitute or imply its endorsement, recommendation,
or favoring by the United States Government or any agency
thereof.  Any views and opinions of authors expressed herein do
not necessarily state or reflect those of the United States
Government or any agency thereof.

   Although all data and software published on this CD-ROM have
been used by the USGS, no warranty, expressed or implied, is made
by the USGS as to the accuracy of the data and related materials
and/or functioning of the software.  The act of distribution
shall not constitute any such warranty and no responsibility is
assumed by the USGS in the use of this data, software, or related
materials.






























                                                              8

                APPENDIX 1: Seismic Data on Disc

                        Final Stack Data

           SampleNumber of  Bytes perBytes per  Traces Per
Line ID     Rate  Samples     Trace     File       File
L1_2FIN.SGY   6     1666       6904   9779664      1416
L1EFIN.SGY    8     1025       4340   2733460       629
L1WFIN.SGY    8     1025       4340   2768180       637
L3FIN.SGY     8     1263       5292  22923252      4331
L4FIN.SGY     8     1275       5340  32625660      6109
L5FIN.SGY     4     2500      10240  37942800      3705
L6FIN.SGY     4     2500      10240  48786960      4764

     Total bytes, final stack data: 157559976


                          Migrated Data

           SampleNumber of  Bytes perBytes per  Traces Per
Line ID     Rate  Samples     Trace     File       File
L1_2MIG.SGY   6     1666       6904   9779664      1416
L1EMIG.SGY    8     1025       4340   2733460       629
L1WMIG.SGY    6     1366       5704   3637048       637
L3MIG.SGY     8     1013       4292  18592252      4331
L4MIG.SGY     8     1013       4292  26223428      6109
L5MIG.SGY     4     2500      10240  37942800      3705
L6MIG.SGY     4     2500      10240  48786960      4764

        Total bytes, migrated data: 147695612


     Total bytes, all seismic data: 305255588
               





















                                                                      9

            APPENDIX 2: Location Information on Disc

               Shot Point Location Data Text Files

L1_2.SPT
L1E.SPT
L1W.SPT
L3.SPT
L4.SPT
L5.SPT
L6.SPT


                  CDP Location Data Text Files

L1_2.CDP
L3.CDP
L4.CDP
L5.CDP
L6.CDP








     APPENDIX 3: Field Recording and Processing Information.

      Field Recording and Processing Parameters: Stack Data

L1_2FIN.SPN
L1EFIN.SPN
L1WFIN.SPN
L3FIN.SPN
L4FIN.SPN
L5FIN.SPN
L6FIN.SPN


    Field Recording and Processing Parameters: Migration Data

L1_2MIG.SPN
L1EMIG.SPN
L1WMIG.SPN
L3MIG.SPN
L4MIG.SPN
L5MIG.SPN
L6MIG.SPN





                                                                      10

            APPENDIX 4: Velocity Information on Disc

              Final Stack Data Velocity Text Files

L1_2FIN.VEL
L1EFIN.VEL
L1WFIN.VEL
L3FIN.VEL
L4FIN.VEL
L5FIN.VEL
L6FIN.VEL


               Migration Data Velocity Text Files

L1_2MIG.VEL
L1EMIG.VEL
L1WMIG.VEL
L3MIG.VEL
L4MIG.VEL
L5MIG.VEL
L6MIG.VEL

































                                                                      11

           APPENDIX 5: Documentation Available on Disc


ACKNOWL.TXT    provides acknowledgments of people involved in the
               production of this disc and sources of data.

AUTHOR.TXT     provides the authors of this CD-ROM.

CDGUIDE.TXT    this file.

CONTACTS.TXT   provides a list of contacts for additional
               information concerning the use of this CD-ROM and
               the U.S. Geological Survey's CD-ROM Support Center

DISCLAIM.TXT   provides the U.S. Government's disclaimer
               concerning the data and software on this CD-ROM.

DUMPSEGY.TXT   provides information on the features and functions
               of the DUMPSEGY seismic data utility program.
               Included is a short tutorial of program function.

LOC.TXT        provides information on the data contained in the
               shot point (.SPT) and CDP (.CDP) location text
               files, including the format of the data.

PLOTSEGY.TXT   provides information on the features and functions
               of the PLOTSEGY seismic display program used to
               display the SEG-Y format seismic data.  Included
               is a short tutorial of program function.

PSGYV2.TXT     provides information abount the changes made to
               PLOTSEGY V1.0 to produce PLOTSEGY V2.0.

REFERENC.TXT   cites references used in the production of this
               CD-ROM.

TITLE.TXT      Title information for this publication.

TRACEPLOT.TXT  provides information on the features and functions
               of the Macintosh SEG-Y display program TRACEPLOT.

VELS.TXT       provides information on the data contained in the
               velocity information files (.VEL), including the
               format of the data.











                                                                      12
