the 'info' i posted was from a Boots & Coots engineer and i didn't make any attempt to verify it. The leases he referred to were off of Virginia. Wouldn't surprise me if they also weren't economic - at least at that time.
i looked into this a bit. it looks like the leases in question were off of North Carolina: the Manteo block.
There was a heap of litigation over the leases which seems to have involved Mobil, Marathon, and Chevron. Eventually, the US Supreme Court did rule in favor of Mobil that there had been a taking.