by phaster » Mon 21 Jul 2014, 16:31:59
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A NG shale well begins declining as soon as it comes on. So the answer to your question is really a function of how many NG shales wells will be drilled in future and, more important, how quickly they will be drilled and at what production rate they come on at. That combines geologic limits and economic limits. And the geologic limits are a function of economics. Which is why so many "experts" use "technically recoverable reserve" estimates because they don't have a clue as to how much will be worth producing in the future.
Just consider the boom time in the Haynesville Shale play before 2009. While at Devon we had 18 rigs drilling in the play when NG peaked above $12/mcf. And then prices cratered very quickly. When it fell below $6.50/mcf the panic began. When prices fell further they cancelled the contracts on 14 of those 18 rigs and paid $40 million in penalties to do so. So in essence Hubbert's approach has no application to shale NG IMHO. It also has little application to predicting future production from undiscovered or even new discovered plays whether they are conventional or unconventional.
thanks for the answer, which kinda confirmed my own guesstimate model that NG shale fracking is best described as a narrow parabolic curve then connected to a long, long, long tail...
Seem to recall that one report I read last year was that china had twice the NG shale reserves than the USA, BUT the shale formations were different AND isolated thus making extraction much more difficult (i.e. not as cost efficient).
I have a gut feeling that while it took mankind about 140 years to reach conventional peak oil (i.e. from about 1870's after drake sank the first oil well, to about 2005 or there a bouts), the peak curve for shale natural gas is going to be vary narrow by comparison 20 to 40 years max because the global population is so much larger and economic growth is dependent upon "inexpensive" energy!