The Tor Field was discovered in 1970 in the Maastrichtian (uppermost Cretaceous) Tor Chalk, which is part of an extensively channelled feature around the margins of the Lindesnes Ridge, further south.
The platform is in c 70m of water. Production of oil and gas began in Jun 1978, but gas became a diminishing component of the output since c 1992. Output is piped c 15km south west to Ekofisk for onward processing and export. Production ceased in 2015.