My case for a probable global crude oil peak, in 2005:In my opinion it is very likely that actual global crude oil production (45 or lower API gravity crude oil) peaked in 2005, while global natural gas production and associated liquids (condensates & natural gas liquids) have so far continued to increase.
I’ve always thought it odd that when we ask for the price of oil, we get the price of 45 or lower API gravity crude oil, but when we ask for the volume of oil, we get some combination of crude oil + condensate + NGL (Natural Gas Liquids) + biofuels + refinery gains.
This is analogous to asking a butcher for the price of beef, and he gives you the price of steak, but if you ask him how much beef he has on hand, he gives you total pounds of steak + roast + ground beef. Shouldn’t the price of an item directly relate to the quantity of the item being priced, and not to the quantity of the item plus the quantity of (partial) substitutes?
In any case, the closest measure of global crude oil production that we have is the EIA data base that tracts global Crude + Condensate (C+C). In regard to this data base, a key question is the ratio of global condensate to C+C production. Unfortunately, we don’t appear to have any global data on the Condensate/(C+C) Ratio. Note that when the EIA discusses “crude oil” they are talking about C+C.
Insofar as I know, the only complete Condensate/(C+C) data base, from one agency, is the Texas RRC data base for Texas, which showed that the Texas Condensate/(C+C) ratio increased from 11.1% in 2005 to 15.4% in 2012. The 2013 ratio (more subject to revision than the 2012 data) shows that the 2013 ratio fell slightly, down to 14.7%, which probably reflects more focus on the crude oil prone areas in the Eagle Ford. The EIA shows that Texas marketed gas production increased at 5%/year from 2005 to 2012, versus a 13%/year rate of increase in Condensate production. So, Texas condensate production increased a about 2.6 times faster than Texas marketed gas production increased, from 2005 to 2012.
The EIA shows that global dry gas production increased at 2.8%/year from 2005 to 2012, a 22% increase in seven years. If the increase in global condensate production only matched the increase in global gas production, global condensate production would be up by 22% in seven years. If global condensate production matched the 2005 to 2012 Texas rates of change (relative to the global increase in gas production), global condensate production would be up by about 67% in seven years.
In any case, we don’t know by what percentage that global condensate production increased from 2005 to 2012. What we do know is that global C+C production increased at only 0.4%/year from 2005 to 2012. In my opinion, the only reasonable conclusion is that rising condensate production accounted for virtually all of the increase in global C+C production from 2005 to 2012, which implies that actual global crude oil production was flat to down from 2005 to 2012, as annual Brent crude oil prices doubled from $55 in 2005 to $112 in 2012.
The following chart shows normalized global gas, NGL and C+C production from 2002 to 2012 (2005 values = 100%).

The following chart shows
estimated normalized global condensate and crude oil production from 2002 to 2012 (2005 values = 100%). I’m assuming that the global Condensate/(C+C) Ratio was about 10% for 2002 to 2005 (versus 11% for Texas in 2005), and then I (conservatively) assume that condensate increased at the same rate as global gas production from 2005 to 2012, which is a much lower rate of increase in condensate (relative to the increase in gas production) than what we saw in Texas from 2005 to 2012.

Based on foregoing assumptions, I estimate that actual annual global crude oil production (45 or lower API gravity crude oil) increased from about 60 mbpd (million barrels per day) in 2002 to about 67 mbpd in 2005, as annual Brent crude oil prices doubled from $25 in 2002 to $55 in 2005.
At the (estimated) 2002 to 2005 rate of increase in global crude oil production, global crude oil production would have been up to about 90 mbpd in 2013.
As annual Brent crude oil prices doubled again, from $55 in 2005 to an average of about $110 for 2011 to 2013 inclusive, I estimate that annual global crude oil production did not materially exceed about 67 mbpd, and probably averaged about 66 mbpd for 2006 to 2013 inclusive.