the most drilled least explored basins

An interesting article, Goes to show WGP have done their research. I'm beginning to think that Kentucky might not just be the company starter but could be the company.

Taking a second look at the “most drilled,
least explored” basins in the world
The Appalachian and Illinois basins — the birthplace of
the modern petroleum industry — are probably the most
extensively drilled and mature hydrocarbon basins in the
world. Does this mean that oil and natural gas resources
from the region have been exhausted? The answer is a
resounding no. The Appalachian and Illinois basins are
mature, yet they still have a youthful potential. Oil and
gas explorer Richard Beardsley, a geologist with extensive experience in the Appalachian basin, calls it the “most drilled and least explored” basin in the world.1
Annual oil production for most Appalachian and Illinois
basin states peaked before 1910, and overall natural gas
production in the region began to decline around 1930.
Notable exceptions include Virginia, where coalbed natural
gas production began in 1990 and has increased every year
since, and Kentucky, where gas production has recently
peaked, growing steadily since reaching a low in 1983.
This recent natural gas production hints at the remaining
potential of the region. So do recent resource discoveries
in the Trenton/Black River formations in New York and
West Virginia, the coalbed natural gas potential throughout
the region, new production from the New Albany Shale
gas play in southern Indiana and northern Kentucky, oil
discoveries in pinnacle reef formations, resources in tight
gas sands, and the potential application of carbon dioxide
injection to enhance oil recovery in old oil fields. All are
clear signs that as far as future oil and gas production
potential in the Appalachian and Illinois basins is concerned,
the story may be far from over.
Cumulatively, the basins have produced more than 5 billion
barrels (BBbl) of oil and 50 trillion cubic feet (Tcf) of natural
gas. Yet after more than a century of production, equal
or greater quantities of resources are still waiting to be
tapped. The Appalachian basin is the largest onshore basin
in the United States in terms of area, and much of the
basin remains relatively unexplored. While determining
the extent of hydrocarbons in the basins is not an exact
science, current estimates of remaining technically recoverable
resources (including proved reserves) are in the
range of 4.8 BBbl of oil and 79 to 96 Tcf of natural gas.
http://www.netl.doe.gov/publications/AP/AIBasins_L.pdf