Neutron Porosity

Uses:

  • Alone or with formation density to determine porosity
  • Normalized count rates from the near and far detectors can be used to distinguish gas from oil.
  • With density to determine rock type via cross-plot
  • With density, crossover indicates presence of gas

Limitations:

  • Shallow depth of investigation increases sensitivity to washout, but since measurements are made soon after drilling, this is less often a problem than with wireline logs.
  • Clay materials contain hydrogen in bound water, often making neutron logs difficult to interpret.

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