Good day all,
I have been trying to load some GRDECL models from Petrel into MRST.
When importing a model with large cell increments (e.g. 5000x5000), everything seems to run fine and smoothly, no errors given.
But when I try to load a model that has smaller cell increments (in this case 500x500), I receive a warning about wrong geometry in grid.

As I tried to fix this issue using the recommended RepairZCORN option, it gives me an error.

Wrong grid reading essentially hinders me in the subsequent work in the MRST, as it seems to not read pore volumes correctly (?).

Any help with resolving this issue would be extremely appreciated!
Thank you!