can be rewritten in its more usual form as:
Neutron logs can be run through casing and many are available in well files where no sonic or a poor sonic is present. Because neutron and sonic logs respond similarly to shale, no special shale compensation is needed with this method.
density log is not as strongly affected by shale, so it requires
more attention to detail:
If there is no neutron log to use as a guide, the
following will give reasonable results for seismic purposes:
is too low in gas zones, giving DELTmod too low and DENSmod too
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