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| (1) |
\rm NPHI = \frac{Count_{near}}{Count_{far}} |
| (2) |
\rm NPHI = \frac{Count_{near}}{Count_{far}} |
| (3) |
\Sigma = (1-\phi) \, \Sigma_m + \phi \, ( \Sigma_w \, s_w + \Sigma_o \, s_o +\Sigma_g \, s_g) |
| (4) |
\Sigma_m = \sum_k \Sigma_k |
In case of two-component sandstone-shale model:
| (5) |
\Sigma_m = (1-V_{sh}) \, \Sigma_{snd} + V_{sh} \, \Sigma_{sh} |
In case of two-component limestone-shale model:
| (6) |
\Sigma_m = (1-V_{sh}) \, \Sigma_{lms} + V_{sh} \, \Sigma_{sh} |
SPE162074 – Memory Pulsed Neutron-Neutron Logging
