Actually that's right. An oil well can produce gas and oil in the same fluid but the gas is usually separated at the wellhead. So the oil sold to refineries shouldn't have natural gas. Wasn't thinking when I typed that one out!
I suppose in reality there probably is still some gas/liquid (propanes, butanes) left in the oil when it gets to the refinery, but the methane that makes up commercial natural gas would be gone.
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