AJ Dual, aside from the BP (Shell?) experiment with underground heating of the shale "in situ", previous methods have mandated the use of a lot of water. The oil-shale area is very low in availability of water--which could mean long-distance transportation of the crushed material.
Sure, the Athabasca tar sands contain a lot of oil, but think "tar". Aside from the mechanical and chemical difficulties of getting it separated from the sand, the percentage of a barrel of this material which is suitable for transportation fuel is probably on the low side. I'm guessing it's mostly petro-chemical feedstock. Art
Yes, that's why tar sands are an estimated 3-1 net energy gain, (for every barrel of oil you burn to dig, drill, transport and refine, you get three&) Current drilling exploration averages out to around 5-1, however in the beginning of industrialized oil exploration it was more like 10-1, so unless geologic exploration, or drilling techniques take a quantum leap, it'll soon be breaking even with the tar sands and shale oil.
Even if the "deep earth" theroies about the origins of oil (megatons of trapped methane and hydrocarbons from the earth's formation instead of "baked organic matter") are true, it does us no good if we can't get to it.
However, the difficulties of refining the sludgy tars from the landlocked oil deposits may not be insurmountable. The Thermal Depolymerization Process where they turn garbage and turkey guts into oil also works to refine low grade sludgy long-chain hydrocarbons as well. There's already talk they're going to hiook TDP plants up to refineries to further refine the sludge that the refineries can't crack.
TDP has been known since at least WWII when the Germans were desperate to create synthetic and alternative fuels, especialy after losing the Romanian oil fields. However it was always a net energy loser because it took more BTU's to cook the water out of the feedstocks before depolymerization could take place than you ever got from the oil you produced.
The new secret that makes TDP a promising net energy gain is that you use a pressure vessel and leave the water in, where it actualy helps break down the feedstocks more efficiently, and when done, you pop the lid, so to speak, and the steam drives itself off on it's own, drying out the product. Depending on the feedstocks the TDP plant can even fire itself from the captured methane.
What would really be great is if TDP can be improved to the point that we can just put a TDP plant in place of every garbage dump in the U.S. Yard waste, diapers, plastic shopping bags, newspaper, it could all become oil...