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→Compensated neutron tool
===Compensated neutron tool===
===Compensated neutron tool===
The compensated neutron measurement is little affected by the presence of steel casing. This permits the compensated neutron to be used in cased hole to estimate porosity when lithology is known. However, the presence of gas in the formation will cause the compensated neutron to underestimate porosity significantly. (For more information on the compensated neutron tool, see “[[Basic Open Hole Tools]]”.)
The compensated neutron measurement is little affected by the presence of steel casing. This permits the compensated neutron to be used in cased hole to estimate porosity when lithology is known. However, the presence of gas in the formation will cause the compensated neutron to underestimate porosity significantly. (For more information on the compensated neutron tool, see “[[Basic open hole tools]]”.)
===Pulsed neutron tool===
===Pulsed neutron tool===