To create regions in petrel you need
2D surface with exact region geometry ( how to create it look to operation tab in surface property you will need eliminate by boundary and surface to surface operation)
and Facies model in petrophysical modelling
Once you there from the fall down tab choose assign values
and use your surface to create new property in your grid
the drawback of this is Petrel uses vertical projection to assign values of your 2D surface nodes to grid nodes and if your have tilted grid the results will not be the same as you will see it on 3D. In this case you can create script in workflow using following formulae
FIPNUM=if (i>=$val and i<=$val1 and j>=$val2 and j<=$val3 and k>=$val4 and k<=$val5, $fip, fipnum)
Where $val1,2,3,4,5 your boundary indexes of grid and $fip is the index of your target fip
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