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\rm NPHI = \frac{Count_{near}}{Count_{far}} |
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\rm NPHI = \frac{Count_{near}}{Count_{far}} |
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\Sigma = (1-\phi) \, \Sigma_m + \phi \, ( \Sigma_w \, s_w + \Sigma_o \, s_o +\Sigma_g \, s_g) |
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\Sigma_m = \sum_k \Sigma_k |
In case of two-component sandstone-shale model:
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\Sigma_m = (1-V_{sh}) \, \Sigma_{snd} + V_{sh} \, \Sigma_{sh} |
In case of two-component limestone-shale model:
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\Sigma_m = (1-V_{sh}) \, \Sigma_{lms} + V_{sh} \, \Sigma_{sh} |
References
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SPE162074 – Memory Pulsed Neutron-Neutron Logging
