What do you use in simulation Pc or Jfunction?

[vinomarky]

You can have as many or as few J-function regions as you need to adequately describe the various rock classes from a saturation & flow characteristics perspective. There are many types of 'facies', used to aid different disciplines to appropriate lump rocks into families - ie electro facies for log analysts, depo facies for geos, hydraulic units for res eng's etc..... They don't always correspond one to one.

Most often though, you normally find that one or more of (for example) depositional facies will fall into a single flow facies (or RQI group). So you simply need to figure out which of the flow facies as described by the geos fits into your RQI classification(s). If (for example) you find facies 1 and 2 both fit nicely in RQI index 1, then you can either calculate a new SATNUM property in Petrel to reflect this, or simply specify identical SCAL/PC tables for SATNUM values of 1 and 2

In your case, if you can identify subgroups of facies that need more granular RQI classes then it may well be appropriate to honour those, although I would question how you intend to identify the extra groups through the entire model - if it is a simple perm/poro cutoff then a simple Petrel property calculation operation would be all you need for a more granular SATNUM array

[catapam]

what I have is poro / perm / Swi data from cores.
the table was already split in 2 by geologist dolomite and limestone
I could ignore geologist split and put everything in 1 table and then to try to split on classes based on RQI
I could also keep the split and to create separate classes for dolomite and separate for limestone
At the end I could have , as example, 3 Pc curves for limestone and 2 Pc curves for dolomite, that will mean 5 SATNUM regions in total.
On the other hand Jfunctions narrow the range and maybe I could have 1 Jfunction for dolomite and 1 for limestone and then 2 SATNUM regions

So my understanding was that using Jfunctions you can have less SATNUM regions compared with using Pc functions.

I have not much experience in simulation so pls tell me if this make sense.