On test I saw several of these. If you have your map open (the small one) and you run/drive/fly over zones, certain areas you'll notice are highlighted in blue. These are representations of notum fields, areas you can drill. They aren't little square patches, but realisticly desplayed, some tiny and half dried up, others much larger and fuller.
Also as you aproach them, your map displays the name of the notum field as well as the level range. I saw a couple patches out in Athen Shire, rather close to the WA zone boarder, that were marked 15-25 lvl. So the lowbies won't be left out after all.
My theory was correct, now all that opposed it, bow down and kiss my ring! .