Much of the land in the southern hemisphere is Antarctica.  To have "biotic" oil, Antarctica would have had to experience millions of years of sustained vegetative growth, right?
Well, it did ... but is geologically unpromising in other ways, as far as I know.
There have been coal seams discovered in Antartica.  Several times in geological history Antartica has had abindant plant & animal life, but not for a majority of the time.

Perhaps there is oil in Antartica, but the repeated addition and removal of ice sheets should surely stress the geology of Antartica and I would not be surpriced if most of the oil did not escape after repeated "flexing" of the cap rock and associated fractures.

Antartica is a small continent.  Slightly smaller than Australia from memory.  So I have little hope for more than a trickle of oil from there by 2150.

Sheesh... that article is real tinfoil-helmet stuff. But then they're gold bugs, aren't they? Most of the world's land is in the North; most of the world's continental shelf; most of the world's sedimentary basins; hence most of the oil.

Look here >>> http://www.britannica.com/eb/article-50720