You can not just sink a drillpipe and get a gusher anymore.Above remark is a quote from an article "
Does the Peak Oil "Myth" Just Fall Down? -- Our Response to CERA" posted on www.theoildrum.com. This article was a response to a recent report by Cambridge Energy Research Associates (CERA)that fears by some scientists and oil industry analysts of world oil production peaking within the near term, i.e. the next 5 to 15 years, are unfounded or greatly exagerated and can therefore safely be discounted.
Does the Peak Oil "Myth" Just Fall Down? -- Our Response to CERAPosted by Dave Cohen
SNIP
Unfortunately, our analysis reveals the same worrisome pattern over and over again for substitutes. The three principal problems with substitutes are listed below.
1. Scalability by volume —new liquid fuel resources can generally only provide a small percentage of the total volumes of liquid fuels supplied by conventional oil. For example, a National Academy of Sciences report came to the following conclusion.
The real risk from all these planned ethanol plants is that they'll use up vast quantities of corn. America's entire corn and soy crop could supply fuel volumes equal to just 12% of gasoline demand and 6% of diesel demand, notes a University of Minnesota ecology professor, David Tilman, an author of the July 25 Proceedings article.
2. Scalability in time —even where there is a vast resource, liquid production flows from substitutes are slow to ramp up. As a result, in the case of exponentially declining oil production not replaced by new conventional oil sources, substitutes will not make up shortfalls incurred in the short-term. To make matters worse, similar remarks apply to production of new conventional oil eg. recovering stranded oil by means of CO2 injection enhanced oil recovery (EOR).
3. Low Energy Returns —this refers to energy returned by a production process for a fuel divided by the energy required to produce the fuel —standardly abbreviated as the EROEI. Both substitutes and, increasingly, new conventional oil production, have lower EROEIs tending toward the limit = 1. The closer one gets to the limit, the smaller the marginal returns. The EROEI term need not be confined to fossil fuel energy inputs but may include all of the economic costs associated with developing an energy fuel resource, depending on where the boundaries for the calculation are set. The general idea here is that the world is not like Spindletop in the Southeast of Texas anymore. You can not just sink a drillpipe and get a gusher anymore. The so-called "low hanging" fruit is gone and what is left is energy-intensive to develop & produce.
In an example of points #1 & #2 above, CERA believes that "GTL and CTL collectively may well represent 6 percent of global productive capacity by 2030", an unimpressive fraction of liquids production as estimated for that time period. Obviously, in the shorter term within the next decade, the percentage of gas-to-liquids or coal-to-liquids that will substitute for conventional oil will be negligible. Similar remarks apply to oil shales. If you believe, as we do, that the peak of production will come sooner rather than later, there is genuine cause for deep concern.
CERA explicitly acknowledges the scalability problems as the timescale of Figure 1 indicates. Despite their belief that the economics of unconventional substitutes is favorable, however, CERA does not seem to take net energy returns into account. There are already problems with the production of the oil sands in Canada, our most successful substitute so far. Capital expenditure costs are soaring to support new incremental production measured in increments of 100/kbd, thus making it harder to attract capital investments. Total production from the sands may be in the 2 to 3/mbd range by 2015, although estimates vary given the ongoing
environment, logistic and net energy concerns there.
http://www.theoildrum.com/story/2006/11/15/83857/186