when it comes to PORV, the final pore volumes of logically Cartesian
grids are hard to implement at this abstraction level because pore
volumes may be either specified using the PORO or by the PORV keywords
and both of them are grid properties. This means that to calculate the
pore volumes using the porosity, the porosity grid property must be
already finished when creating PORV. Because of potential interactions
between the PORV and PORO grid properties this is not possible to do
canonically at the grid property initializer stage...
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