If you are running Encounter using LEF to represent your typical standard cells, then you would have to create a LEF from the Virtuoso Abstract view. If you have not done this before you should consult a Virtuoso AE for this. There are several ways to control the amount of detail ( pin parasitic, antennas ) in the abstract and setting the right switches is important. Once the LEF is generated, you would add that .LEF as well as .lib (timing) entry to your EDI setup so that you can place and route the register file along with the rest of the design.
If you are on OA (Open Access libraries for both Virtuoso and EDI ), then the same rules apply with the exception of generating a LEF. EDI can read the OA abstact view you created. Similar to using the LEF, add the name of the Virtuoso library that contains that cell to your list of OA libraries that the tool is reading.
I hope that gets you going in the right direction.