This is the Puma SA330, SSG-9M on the Tenama; it crashed and rolled over with the subsequent fire. There were 13 persons on board - 4 minor injuries and no fatalities.
The accident on the Forties was S58T, G-BCRU and was on approach to the Forties 'C', its tail rotor detached and a forced landing was carried out onto the helideck. The helicopter fell off the helideck and onto the 'Thor' (a crane barge); the helicopter was destroyed by impact and subsequent fire.
There was a MI-17 crash in the late 70s or early 80s; a relevant picture - in a recent publication - shows it burnt out on the helideck.
In the GOM in 1985, a Bell 222, N3194 dropped into pressurised natural gas containing equipment. The released gas subsequently ignited, producing an intense fire. There were 9 persons on board and of these there were 2 fatalities.
In the GOM in 1987, an SA330 skidded on the heliceck and the tail boom hit the platform leg. The helicopter rolled over and exploded killing all occupants.
There are others!
Jim