Total sum of formation units within a given bedding with depth intervals of a given formation unit with porosity above the porosity cut-off:
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h_{\rm eff} = \sum_k h_k |_{\phi_k > \phi_0} |
It closely related to concept of http://nafta.wiki/x/44DGAQ
See also
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Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petroleum Geology