There accumulated the first of our tale, a deposit of what we now call conventional oil.
Because of this additional history, oil sands differ in structure as well as content from conventional oil deposits.
"Shale gas producers expanded payrolls, while employment at conventional oil and gas firms was flat, " the Fed noted.
And the risk of earthquakes, which has long been present in conventional oil-and-gas extraction, is modest and mitigated by monitoring.
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Production of oil from tar sands bitumen produces between three and five times the greenhouse gas pollution of conventional oil production.
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As conventional oil is depleted and becomes harder to find, oil companies will increasingly look to unconventional sources to boost production.
First, what is essentially a conventional oil and gas well is drilled vertically, typically to several thousand feet or more below the surface.
That's not a problem for many people in Illinois counties where conventional oil and gas drilling has been going on for over a century.
Chevron already operates a couple of conventional oil and gas projects in Argentina, but its newly broadened ambitions there have a distinct regional significance.
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L., total emissions are almost two times as high as with conventional oil, and for oil shale they can be more than twice as high.
The Insurance segment provides annuity and life insurance products to the middle and upper-middle income markets in the U.S. The Energy segment owns and operates conventional oil and natural gas properties.
In the Fourth District, which includes western Pennsylvania and Ohio, the survey says shale gas activity is expanding at a robust pace, while conventional oil and gas was steady.
More within the realm of possibility are the more conventional oil and gas resources on, according to Mulva, 2.4 billion acres controlled by the federal government (I haven't fact-checked that number, but it feels high).
The characteristics of diluted oil sands crude, such as that which would be transported by Keystone XL, are similar to conventional crude oil.
"It's one of my proudest moments, " says Mr. Hardberger, who also has a more conventional canvas oil portrait hanging in city hall.
The resulting mixture has properties similar to conventional fuel oil.
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They are the same risks that our industry has been managing for more than 100 years in the conventional development of oil and natural gas.
As the conventional and cheap oil and gas start to dry up in the Middle East, a bigger, even better opportunity seeks to replace it.
Most immediately, what fusion in any of its manifestations does not address is the problem of providing liquid fuels as conventional supplies of oil and gas decline, and it is this which is the greatest and most pressing matter to be dealt with, against a backdrop of mere years not a luxury of decades.
As traditional oil fields yield less and less, major producers are looking for crude in less conventional places, from oil sands and shale plays to ultra deepwater.
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The planet is endowed with plentiful sources of natural gas and oil, conventional and unconventional.
Advanced technologies have made it possible to not just extract more oil from conventional sources previously thought tapped, but frack and deep-water drill in spots not even thought of 20 years ago.
But the shift towards synthetic fuel has provoked criticism, because when such fuel is made from coal and then burned in an aircraft engine, more greenhouse gases are emitted overall than would be produced if the aircraft simply burned conventional fuel derived from oil.
At the nexus of these life-improving advancements and routine behavior, however, stand conventional energy sources, especially oil.
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They also argued that the production of this particular oil, recovered from oil sands, imposed more environmental damage than oil produced from conventional deposits.
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Much of this increase in demand will come from the transportation sector and largely in the developing world, where poorer people will use oil and other conventional energy sources to improve their living standards.
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There are plaintive calls that there should be no more such exploration and that surely alternative sources can be accessed, but this avoids the underlying truth that much of the conventional easily-got onshore oil has already been pulled from the earth.
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And Canada is still fighting for an exemption from a rule inserted into the 2007 Energy Independence and Security Act that bars the American government from buying fuels whose production causes more greenhouse-gas emissions than conventional petroleum sources, as producing oil from tar sands does.
Nevertheless, conventional hybrids are still locked into the oil economy, with a drive shaft directly connected to a gasoline engine.
The conventional route to biodiesel consists of extracting oil from plants and converting it to the methyl esters of fatty acids that are present in the lipid-components, known as triglycerides.
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