COMPENSATED NEUTRON LOG – CNL

Compensated neutron log is a type of well log that is used to determine the porosity of each formation in a cased or open well and is adjusted for irregularities in the wellbore. The compensated neutron log bombards each formation in the well with high-speed neutrons from a radioactive source such as a mixture of plutonium-beryllium or americium-beryllium located in the tool. Two detectors measure the number of gamma rays and/or slow neutrons that are emitted from the formation to determine the hydrogen content of the rocks. Hydrogen is an element in the water, gas, or oil that occupies the pore space. The two detectors compensate for rugosity of the well walls.
The ratio of detector responses allows conversion to a linear porosity reading that is good for both highand low-porosity formations. The log is recorded as either density or porosity (assuming a limestone matrix) in Track 2.

The compensated neutron log is used for:
a) porosity, b) correlation, c) gas effect, d) crossplots for lithology, e) tie-in log for perforating, and f) bit selection.

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