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this post was submitted on 20 Oct 2023
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I think you might have made a typo in the title because wouldn't 1 barrel of oil produce 1 barrel of oil since they're the same thing, or do you mean gasoline?
I think they're talking about using the energy produced from that barrel of oil to extract more oil.
I think they mean all the gasoline/oil/energy consumed by heavy machinery like refineries, tanker ships, mining derricks, drillers, prospectors, etc. to manufacture one barrel of finished oil.
Edit: found the term OP is looking for: energy returned on energy invested (ERoEI). It used to be "18 to 43" for conventional oil drilling, but can be as low as 1.5 for the new oil shale extraction, due to needing to burn large amounts of methane gas to heat the ground to free up the oil.