synthetic below demonstrates the serious mismatch that can occur
when log editing is omitted. The strong events at the top of the
Cretaceous and in the Lower Jurassic are artifacts of bad hole
condition affecting the sonic log. Small mis-ties are caused by
these problems and other rock alteration. Since I personally made
this synthetic in 1969, I feel comfortable criticizing it now, but I
thought it was a good match at the time. Today, it would be
inadequate and could be improved.
Synthetics and seismic models can also include multiple reflections or shear wave models from shear wave sonic logs. Normal moveout is rarely modeled on a synthetic, but it might be useful to identify reflectors on raw seismic records.
Case Histories in the next Section to see some really well
done seismic models.
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