neutron log
Post on 18-Jul-2016
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NeutronNeutron Log LogPenilaian Formasi Penilaian Formasi
STT MIGAS BalikpapanSTT MIGAS Balikpapan20132013
Theorytical Theorytical BBackgroundackground It measures hydrogen concentration in the formationIt measures hydrogen concentration in the formation Hydrogen is mostly in water, oil and gas.Hydrogen is mostly in water, oil and gas. Neutron log can be recorded in cased or open holeNeutron log can be recorded in cased or open hole Neutron log will record all of the hydrogen ionNeutron log will record all of the hydrogen ion
Neutron Log ApplicationNeutron Log Application
• As a porosity log• Lithology identification• Gas identification
Neutron Log InterpretationNeutron Log Interpretation
The compensated neutron logging tool does NOT measure porosity. It measures a hydrogen index. The hydrogen index is related to porosity, but is affected by lithology and fluid properties.
The measurement is displayed as porosity.
Porosity is usually computed with limestone matrix.
After all borehole corrections, the measurement only represents true formation porosity in a clean limestone formation filled with fresh water.
Porosity vs. MatrixPorosity vs. Matrix
Schlumberger Chart Por-13b
Apparent Limestone Porosity (p.u.)
True
Por
osity
for I
ndic
ated
Mat
rix
20 p.u.
25 p.u.
17 p.u.
20 p.u.
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