OCTAVE vfitw.m - Determine interval velocities down-hole using vertical times plot and mouse
vfitw prompts for:
BSEGY file name
(*.seg) (shell terminal input)
Choose Units for plots (feet or meters) (GUI Click Box)
Choose vertical axis: Depth or Elevation (GUI Click Box)
Enter a title for plot (GUI Entry Box)
Choose to save to disk (depth|elevation, vertical times)
(GUI Click Box)
LOOP
Do an interval? (GUI Click box)
Click START and END of an interval to least squares linear
fit to vertical times
(interval velocity computed from slope)
CLICK point to label plot with interval velocity and 95%
confidence
Choose Continue or Done (GUI click box) if continue loop
back and do another segment
Basic Seismic Utilities (BSU) program run in Octave or Matlab. Within an octave session, type vfitw and then on prompt, enter the bsegy format file name (example: xxxx.seg). Then answer prompts as shown above. Segments of the data are picked for solution of an interval velocity. The mouse is used to click a top and then bottom of an interval of data. A third click marks the location on the plot for labeling the interval velocity. The program loops for additional intervals until the user indicates they are done. If results are saved to disk, these files will be named xxxx.seg.vt (observed data) and xxxx.seg.vt2 (fit solutions). One may also improve the graphic representation of the solutions by running vplot.m which reads the *.vt and *.vt2 files.
Interactive
plot with least squares solutions
xxxx.seg.vt Observed data (depth|elevation, vertical time)
xxxx.seg.vt2 LSQ Solutions to (depth|elevation, vertical
time) fit
segyinfo.m
bsegin.m
OCTAVE: segyinfo.m(7) bsegin.m(7) vplot.m(7)
No known bugs.
Copyright © 2017 by Paul Michaels
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
P. Michaels, PE. <pm@cgiss.boisestate.edu>