Every little wiggle has a meaning all its own. This is our
underlying faith, that details of seismic waveshapes can tell us
the details of the nature of the earth. But their voices are
obscured by many irrelevancies. They speak in a high-noise
environment, and we have been able to decipher only a small
portion. However, things are looking up: better tech niques are
lessening the irrelevancies, and we are learning to read. In
exploration of unknown areas, determining the nature of the rocks
present is often the difficult aspect. Most of the properties of
rocks that can be measured at a distance are not distinctive enough
to identify the rock unambiguously. Con ventionally, seismic data
are used to determine aspects of the structure. Stratigraphic
pictures are inferred from the struc ture, the nature of rocks
exposed for examination in the sur rounding area, and regional
concepts. Three points make seismic stratigraphy feasible now: (1)
we have better data quality, (2) we have begun to sys tematize
analysis procedures, and (3) we believe in the geologic
significance of waveshape details."
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