Environmental Engineering Reference
In-Depth Information
Fig. 11.19
Near/far count-rate display. Courtesy Schlumberger
Background and Quality Curves
The background curve is a very insensitive natural gamma ray curve. There should
be little movement on this curve except in “hot” zones which are very radioactive.
This curve is sometimes omitted without any great loss.
Summary
The most important curves of the pulsed neutron log are:
ʣ
for water saturation
Ratio
for porosity
GR
for shale content
Near/Far display
for gas indications
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