Go to the list of seismic processes.
Go to SIOSEIS introduction.
This is the story of how I processed some data
from Antarctica. It shows most of the techniques
and reasoning for determining the processing steps
and parameters.
Step 1: Read a line from tape to disk. The data were
recorded in SEG-D and were converted to SEG-Y with SIOSEIS
on the R/V Palmer.
script #1 - Read a tape to disk
Step 2: Look at the first shot:
1) Determine if the channel numbers are really backwards.
2) See what traces are bad.
script #2 - Create a plot of the first shot
plot #2 - plot of shot 1.
Step 3: Determine a working filter
1) First try was just pass 20 80, but it passed the
"low" frequency ringing trace. The default is a "gentle"
short time domain filter.
2) Second try was ftype 0 pass 20 80 dbdrop 48, but
we noticed that the dipping event between 8 and 9
seconds was missing. ftype 0 means that the filtering
is done in the frequency domain.
3) The third filter was ftype 0 pass 10 80 dbdrop 48.
script #3 - The script to filter and plot the first shot.
plot #3 - The plot of the first shot, filtered.
Step 4: Look at a single channel plot of the entire line
script #4
Plot #4 - Plot of trace 1 of every shot
Step 5: Check the geometry
script #5
plot #5 - Plot of shot 1 with nmo
Step 6: Gather the data by rp.
This example throws out the bad data before gather
so that less disk space is needed. It may be advantagous
to include the bad traces in the gathers, then kill
them using XWP (range-weight-pairs) of process weight.
gather script
Step 7: Check the mute.
script #7
plot #7 - Plot of shot 1 with nmo and mute.
Step 8: Constant velocity stack
script #8 - Constant velocity stack
spectra - Uncontoured semblance spectra
Step 9: Stack the line
script #9
plot #9 - The stack with agc.
Step 10: FK migration
script #10
plot #10 - FK migration
Step 11: gain and display
script #11
plot #11 - root gain and display
Go to the list of seismic processes.
Go to SIOSEIS introduction.