Easily accessible crude oil is rapidly becoming a scarce commodity. The EROEI has decreased from 100:1 in the early 20th century to roughly 25:1 at present. Light tight oil (LTO) plays are closer to 10:1 in scope, and oil sands production varies from 5:1 to a low of 3:1.
What remains to be seen is how quickly the LTO plays will manage to keep up their production numbers, as high grading consumes the most prolific plays.
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