
Source: Smithsonian. May 2013 map of shale oil and gas formation. fource U.S. EIA & USGS.
Preface. Unconventional US (and some Canadian) fracked tight oil was over 90% of how oil production increased after conventional oil peaked in 2008, but US fracked oil peaked in 2018 (and consequently all world oil, both conventional and unconventional also peaked then). Only the Permian shale basin is not in decline yet.







