Example of BTOR

Consider a single depth station for illustration. There may actually be 100 or more depth stations in a single down-hole survey. There are two files in this example:

• c009.seg Source orientation is azimuth 270 degrees, 90 degrees from vertical (ie. horizontal blow West).
• c010.seg Source orientatio is azimuth 90 degrees, 90 degrees from the vertical (ie. horizontal blow East).

The steps are:

1. gobhodo This generates the difference between scaled versions of the two source efforts. The scaling is done on the vertical component of the down-hole phone (ch 1 on the author's wiring). File 9 is subtracted from 10. The difference file is renamed as h010009.seg
2. gorunbhod Program bhod is run to analyze file h010009.seg and produces files:
   h0010.plt.ps, bhod.lst
   These are the hodogram plot and a file with the determined phone orientations (R and T downhole)

   The command in the script for this depth is:
   bhod h010009.seg 2 3 50 90.0 180.0 +90.0
   Ch 2 is R and Ch 3 is T component downhole. 50 percent max amplitudes used in analysis 90 deg is source azimuth (ie E-W) and bowspring, R-phone observation is close to 180 degrees. The downhole phone is wired for +90 degrees between R and T components

3. BTOR This program inserts the orientations of the phone azimuths and vertical orientations into the headers.
   The command in the script for this depth is:
   btor bhod.lst c -1 6
   This command will process ALL the cxxx.seg files in the directory (subject to be included in the bhod.lst file).

Renaming btorxxxx.seg files to xxxx.seg

A script to rename the BTOR files in a directory is as follows:

 #!/bin/sh
#Script to rename files after btor process
#overwrite pxxx.seg files, p=prefix
# Author: P. Michaels     Date:April 2002   See GNU License

if test "$1" = ”
   then
     echo 'Enter 1 character prefix'
     echo 'Example:  w'
     echo ' for files btorw001.seg, btorw002.seg, etc...'
     read PRFX
   else
     PRFX=$1
fi

 find -name "$PRFX*.seg" |  \
 sed s/'\.\/'/' '/g |       \
 gawk '{print "mv","btor"$1,$1}'   \
  >go-rename
chmod +x go-rename
./go-rename
echo "btor files renamed"