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173 comments on DrumBeat: February 1, 2007

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Khebab on February 1, 2007 - 11:21am Permalink | Subthread | Parent | Comments top

Besides, the addition of different liquids on a volumetric basis can be very misleading because they have different BTU content per barrel. For instance, you need 1.22 barrels of NGPL to match the BTU content of one barrel of crude oil. Volumes are increasing but the energy quality/density is decreasing.

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goinggreen on February 1, 2007 - 12:15pm Permalink | Subthread | Parent | Comments top

Khebab: I was going to ask if you would repost your plots that showed the BTU content plots in one of the recent drumbeats. This observation is extraordinarily important and a serious answer to those arguing that supply is growing. You cannot argue against good physics.

Question for you and others. Is there any sense of how the EROI will decrease going forward? At 1% energy cost of output it isn't a big deal. At 8:1, we are talking 12% cost and as the return on energy decreases, this really starts to become a significant component. EROI combined with the degrading BTU content could make the depletion problem significantly worse than what people have thought or have plotted to date. It could even make the CERA forecast look bad. Thoughts?

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toilforoil on February 1, 2007 - 2:05pm Permalink | Subthread | Parent | Comments top

You and Khebab are clearly emphasing a critically important point.

I would just note that EROI doesn't have to be "combined with a degrading BTU content" since the latter is integral to the former.

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goinggreen on February 1, 2007 - 2:26pm Permalink | Subthread | Parent | Comments top

Ah yes, of course, you are correct.

Does anyone have an EROI historical curve for Texas as it went through peak and depletion?

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Khebab on February 1, 2007 - 2:13pm Permalink | Subthread | Parent | Comments top

Here we go:



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