`PENUM`

Recognised by the OPM Flow parserREGIONS

The PENNUM keyword defines the petro-elastic region number for each grid block that is used to assign the of petro-elastic coefficients, bulk modulus functions and shear modulus functions as defined by the PECOEFS, PEKTAB and PEGTAB series of keywords in the PROPS section.

This keyword is not supported by OPM Flow but would change the results if supported so the simulation will be stopped.