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:
- 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
- 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
- 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"