Since several survey details are likely to vary from one bore hole to the next, you must edit a few lines of the file, Merge. These lines are near the top of the file and are reproduced below. The boxed values will need to be changed.
#set -x
#...define parameters YOU MUST DEFINE THESE FOR EACH NEW SURVEY
# SINCE IT IS LIKELY THAT THE NUMBER OF RECORDS
# WILL VARY WITH EACH SURVEY !!!!
odmin=01
evmin=02
# eklmax=(odmax-1)/2
eklmax=`bc <<END
($odmax-1)/2
END`
echo $eklmax
# oklmax=eklmax+1
oklmax=`bc <<END
($eklmax+1)
END`
echo $oklmax
#shaping filter parameters (bshp)
tmin=0.
tmax=0.1
npf=360
stab=.0001
#polarity file definitions
The record numbers in the GeoLogan97 survey run from 1 through 146.
The odd numbered records are 1, 3, 5, . . .145. Thus, odmin=01
and odmax=145. You will have to edit Merge to change
odmax from 163 to the current value of 145. Similarly, the
even numbered records run from 2, 3, 4, . . . 146. You will have
to change evmax to 146. In the GeoLogan97 survey, the odd numbered
records had a source azimuth of and the even numbered records
a source azimuth of
. Thus, the variables az90 and
az270 will have to be changed to match the current survey.
Set az90=1 and az270=2. These two values affect the
order of subtraction between the two polarities of the source, and
hence the final sign convention of the enhanced data. Finally, the
prefix for the GeoLogan97 data is ``L'', not ``w''. Make the
change so that PRFX=L. Depending on your views, you may also
wish to modify the shaping filter parameters (see program bshp).
The shaping filter corrects for triggering variations and source blow
amplitude variations which might be mistaken for down-hole geologic
effects, were it not for our monitoring of the source with a stationary
reference phone.
pm 2018-04-08