If Wolverine can regenerate from a single cell and got blown to pieces?

Negative.. if his head gets cut he's good as dead

All the meat would be blown off the bones, but the bones would be protected by the adamantium shielding them, so the the cells would just grow back on the bones since some pieces of the heart would be caught in the rib cage and it makes sense to assume that they would be the cells which would regenerate.

The pieces would be attracted to each other and join together again and then Wolverine's body would regenerate from there.

I reckon youd get one, maybe the pieces would come together and create wolverine again... It would probably take years though. And the adamantium skeleton wouldnt be in his body because its not part of his natural DNA. Interesting question...

In wolverine vs hulk he was torn in half, and he had to collect his lower half to reconstruct himself