Agreed, and dont forget territorial boundaries within the oceans. Its a domino effect, and once you have overlapping territories in oceans, seas etc, it be all yours.

Legislation is still quite loose regards what is beneath the ground, beneath the waves off the Antarctic. Slant drilling would get around current legislation.

The removal of nuclear reactors from Antarctica in the late seventies, which I seriosly question, does not include the nuclear ice breakers the Ruskies currently employ, which are also used in the Arctic as power platforms.

Raytheon now 'powns' all of the US assets down there, and their kind of tech' needs big power. The two million litres of oil/gas they already use in the US zone per year doesnt cover it.

So, getting back to the point of this thread, yes, this is less about general oil areas (refuse to say reserves, as they havent been created yet) and more about Antarctic placement and a very specific oil found in that region.
(let alone the aquifers and deep ice lakes of the region.