Utilize the input text as a context reference, choose the right relationship between 'Talisman Energy' and 'Petroleum' from the options.
Options: chief executive officer, original broadcaster, operator, product/material produced

He then moved to Clyde Petroleum where he was managing director, then to Paladin Resources as chief executive until its acquisition by Talisman Energy (EUREX: 23554.EX - news ) in 2005.
product/material produced