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{\rm NTG} = \frac{V_{\phi>\phi_0}}{V_{\rm bulk}} |
This concept is usually used as a cell property in 3D models to identify which part of the cell volume is actually contributing to the fluid dynamics and disqualify the cell from calculations if NTG is 0.
See also
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Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petroleum Geology