The details of the find illustrate the underlying problem with all of the various solutions:
The Pre-Salt rock consists of reservoir that is found under an extensive layer of salt, which extends from the state of Espírito Santo to the state of Santa Catarina. The formation is more than 800 kilometers long and up to 200 kilometers wide, and is located in ultra-deep waters of between 1,500 and 3,000 meters and burial between 3,000 and 4,000 meters.
LINK
The deposit is deep, and it will be costly and challenging to develop.
The real problem is, "costly" has two dimensions. The less important one is money. The deeper issue is EROEI - Energy Returned on Energy Invested. If it costs the energy equivalent of 2 barrels of oil to extract 1 barrel of oil, there is a net energy cost. For example, a business that produced a product which cost $2 to make then sold that product for $1, it wouldn't survive very long.
This is where the tar sands and shale deposits come in. They cost a lot of energy (again, this is completely apart from money) to produce. Tar sands, by the way, use natural gas in the extraction process, and lots of it. Lots of U.S. homes are heated with natural gas, and quite a number of electricity generation facilities use natural gas. But U.S. natural gas is depleting, and shipping in LNG is expensive. Not good for the future.
As if that weren't enough, the flows tend to be low. Every little bit may help, but there simply isn't enough flow from any of these sources to fuel the economy.
This is the challenge of our oil situation. We've built up a dependency on oil, often from foreign sources. Replacing oil with some other substance is going to be a very difficult project. (Don't take my word for it - the Department of Energy has a 91 page report on the subject:
LINK )
By the way...purely my opinion...but the current runup in price on crude oil is only the first few clouds on the distant perimeter of a force 5 hurricane. In a few years, oil may well be priced in the hundreds of dollars per barrel. We appear to have peaked.