NEW DELHI : Oil and Natural Gas Corporation (ONGC) is set to invest over $600 million for the development of assets of Imperial Energy, in addition to its acquisition price of $2.1 billion, said a company official Monday.

ONGC acquired Imperial Energy after more than 97 percent of its shareholders had approved the deal last December.

An official at the state-run oil upstream major said ONGC will invest $600 million to develop Imperial's strategic assets in the western Siberian region of Russia, which is one of the highest oil-producing regions in the world.

ONGC wants to make Imperial's asset a platform for further expansion in the region.

IANS