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This paper has presented an inversion scheme that uses steering filters
as a preconditioning operator. These steering filters tend to create dips
along chosen reflectors. We presented
a 1-D scheme in which the steering filters simply tried to act horizontally
along the ph axis and a 2-D scheme in which the tendency to create
horizontal dips
along the ph axis was cascaded with steering filters tending to create
dips along picked
reflectors in the CMP-depth plane. Both of these methods increased the
signal-to-noise ratio and helped to fill in the shadow zones.
We also examined the effect of variation in the picked reflectors for the
2-D scheme. This was done by picking a variety of reflectors based on both
the correct and the incorrect dips. This experiment showed that the
inversion will reject dips that are incorrectly picked where data exists.
This can even indicate areas where faulting has occurred. The inversion
assures that picked dips that generate an event which
interferes with the data are rejected. Picked dips that generate an event
that doesn't interfere with existing data are allowed. Picked dips that
cross, or meet at a point can be accommodated by the inversion. It is
necessary to pick reflectors wherever the dominant dip changes.
Next: Future Plans
Up: Prucha and Biondi: STANFORD
Previous: Steering filter test
Stanford Exploration Project
6/7/2002