Total sum of formation units with depth intervals of a given formation unit with porosity above the porosity cut-off:
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h_e = \sum_k h_k |_{\phi_k > \phi_0} = NTG \cdot h_t |
It's closely related to concept of NTG Thickness:
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h_e = NTG \cdot h_t |
where
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See also
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Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petroleum Geology