It's really no secret in Saudi Arabia's case. They cut production in the 80s as part of agreement with OPEC. They have regularly set relatively public production quotas. They may not be holding back right this minute, but they have habitually held back intentionally and it's quite public.What makes you think someone like Saudi Arabia or Venezuela is 'holding back'?
http://www.eia.gov/countries/cab.cfm?fips=sa
In October 2014, they were producing 9.7ish million.Saudi Arabia maintains the world's largest crude oil production capacity, estimated to reach about 12 million bbl/d at the end of 2014, and the country is subject to OPEC production quotas
http://ycharts.com/indicators/saudi_ara ... production
Current oil consumption is somewhere around 92 million/year.
https://financialpostbusiness.files.wor ... _c_ab.jpeg
They essentially produce about 10.5% now, and they can produce as much as 13% of world demand with current production capacity -- no investment in additional pumps, wells, etc.
Furthermore, production all across the rest of the world is being shut down.
Essentially, oil is more a buyer's market than a seller's market nowadays. The only reason it wasn't a buyer's market before is because supply was being artificially restricted. When the US started investing in oil shale, however, it functioned as a swing producer which forced the lower cost producers to either cut production or accept a loss of market share. Saudi Arabia was the only member of OPEC that has reliably cut production to meet quotas before. This time, they chose not to. The result is that we had that big crash in oil prices a few years back.
We aren't at peak oil yet on a global basis. On the other hand, the US is way past its peak oil production.
The thing is, as oil prices rise, so do effective reserves. US shale oil is not viable at $50/barrel. At $70/barrel it's an attractive investment. At $100/barrel, it's a bonanza.
Of course, there are terrible environmental consequences and the EROI of oil shale is very low. However, the principal value of oil isn't so much the EROI anymore so much as its value as a chemical feedstock and high energy density fuel precursor.
EDIT: It's worth noting that I don't drive a car and have no desire to. I'm really not pro-oil dependency/usage. Our reliance on fossil fuels is pretty terrible, but since we do rely on them, having them available is probably better than not. Our technology and infrastructure to produce alternatives is also rapidly improving -- fast enough that we could be on almost entirely renewables within 3-5 decades. That's not a faith based statement so much as a research based one. I agree that blind optimism is silly, and technology/science has its limits (warp drives, anyone?), but this doesn't really appear to be one of them, in the long term.
http://c1cleantechnicacom.wpengine.netd ... h-rate.png
This is exponential growth, and if even one of them holds up for more than few decades we don't really need to worry about having a declining long-term energy budget, we'll just be dedicating more of our capital to replenishment than consumption. There's no inherent problem in this, especially for us savers.
The thing I always used to worry about us running out of fossil fuels before we could switch over to renewables. However, becoming more aware of the multiple decades of conventional oil, and separate multiple decades of shale oil available has made me more worried about global warming than EROI.