hiiiiii all
i agree with all written from all brothers,
when i said yes you can work with eclipse without any help from petrel ,i was meaning that the static model can be imported from any other software like RMS, gocad,....i wasnt so clear.
for ACTNUM i think the Porosity may be good property for that but you have to care for the facies modeling for example shale values will be high and care also for the IOIP as you will remove volumes from the model.
i never use ACTNUM to reduce the no. of cells to decrease simulation time.
i always use UPSCALING module in PETREL to do this job.
you got two benifits
frist decrease the no. of cells without removing any part from the model,
second the upscalled grid will have average properties for the original ones,
at last you use well correlation window to check the validity of the properties of upscaled grids with the original properties for all wells.
i hope it is clear
Regards,
reservoir_engineer