"The SEC has notified us that it has closed its inquiry into Shell in relation to OPL 245," a Shell spokeswoman said.

On Wednesday, Italy's Eni, which acquired the OPL 245 block together with Shell, said the SEC had also closed its investigation into its activity in Nigeria, as well as other activities in Congo.

Eni and Shell are currently on trial in Italy over allegations they bought OPL 245 in 2011 knowing most of the $1.3 billion price would go to agents and middlemen in bribes.

(Reporting by Ron Bousso;Editing by Elaine Hardcastle)