There's a great interactive chart at this post that compares exactly onshore vs offshore US crude oil production.
In addition: look at these stats:
- the production in November, 2017, was 13.1% greater year-over-year (2017 compared to 2016)
- production in November, 2017, was 42.8% greater than 2012, when the Bakken was hitting its stride
- production in November, 2017, almost exactly doubled (99.4%) US production in November, 2007, the year of the "discovery" well in the Bakken
Memo to self: send note to Jane ("it's all hype") Nielson -- https://theamericanwestatrisk.wordpress.com/2010/06/25/bakken-oil-hype/.
The interesting thing is that when Barack Obama said this, he was removing Federal land from oil exploration. A "drill, baby, drill" strategy off-shore and on Federal land would have probably been as successful as the shale revolution had the former not been stopped dead in its tracks.