My money would be on the Sir Michael... ex J.C.Philips ex Gulf Gatineau.
Reasons:
1. The ventilation grille on the after side of the funnel did not appear on the Enerchem Avance. Both Gulf Mackenzie and Gulf Gatineau had those vents as built and throughout subsequent ownerships.
2. Only J.C.Phillips ex Gulf Gatineau had the exhaust stack extensions. They were added before 1992, and do not appear on sister. Her exhaust pipes barely showed above the top of the funnel.