Casaubon's Book

Once upon a time, I advised people looking for a peaceful and happy future to choose land under which there were no energy resources. I should have taken my own advice – I’m on the fringe of the Marcellus Shale and the discussion and debate is becoming heated here. Like everyone, I don’t particularly want a natural gas flare and dig across the road from me, but that alone wouldn’t be enough to make me object – they have to drill somewhere, and Americans use a lot of energy. NIMBYism itself isn’t sufficient. What’s much more important is that I’m not convinced that the results will be impressive enough to justify the environmental costs. Neither is Geologist Art Berman who has emerged as a rational voice about the inevitably-revised-down numbers energy companies like to throw around.

If you investigate the origin of this supposed 100-year supply of natural gas…where does this come from? If you go back to the Potential Gas Committee’s [PGC] report, which is where I believe it comes from, and if you look at the magnitude of the technically recoverable resource they describe and you divide it by annual US consumption, you come up with 90 years, not 100. Some would say that’s splitting hairs, yet 10% is 10%. But if you go on and you actually read the report, they say that the probable number-I think they call it the P-2 number-is closer to 450 Tcf as opposed to roughly 1800 Tcf. What they’re saying is that if you pin this thing down where there have actually been some wells drilled that have actually produced some gas, the technically recoverable resource is closer to 450. And if you divide that by three, which is the component that is shale gas, you get about 150 Tcf and that’s about 7 year’s worth of US supply from shale. I happen to think that that’s a pretty darn realistic estimate. And remember that that’s a resource number, not a reserve number; it has nothing to do with commercial extractability. So the gross resource from shale is probably about 7 years worth of supply.

For a project that a colleague and I did for a client, I actually went in and looked at all the shale plays and assigned some kind of a resource number to them. I also used some work that was done by Wendell Medlock at Rice University’s Baker Institute. He did an absolutely brilliant job of independently determining what the size of the resource plays in Canada and the US might be.

The resource hasn’t been misrepresented but the probable component has not been properly explained as a much smaller component of the total resource; I guess they just didn’t read the PGC’s report carefully enough. If you take the proved reserves plus the report’s probable technically recoverable number, we have something like 25 years of natural gas supply in North America, which is quite a bit. It’s a lot. I don’t say any of this to give shale gas a bad name.

The other interesting thing about the PGC’s report that nobody seems to pay attention is this: they said there is something like 650 Tcf of potential shale gas. Well, there’s 1000 Tcf of something else. What’s the something else? It’s conventional reservoirs plus non-shale/non-coalbed-methane unconventional reservoirs. So there’s 70 percent more resource in better quality rocks than shale. It just astonishes me that nobody has paid any attention to that.

So that’s the simple view. And then the other thing that we see empirically is that if you look at any of these individual shale-gas plays-whether it’s the Haynesville or the Barnett or the Fayetteville-they all contract to a core area that has the potential to be commercial that is on the order of 10 to 20 percent of the geographic area that was originally represented as all being the same. So if you take the resource size that’s advertized-say for the Haynesville shale, something like 250 Tcf-and you look at the area that’s emerging as the core area, it’s less than 10 percent of the total. So is 25 Tcf a reasonable number for the Haynesville shale? Yeah, it probably is. And it’s a huge number. But the number sure is not 250 Tcf, and that’s the way all of these plays seem to be going. They remain significant. It hasn’t been proved to me yet that any of it is commercial, but they’re drilling it like mad, there’s no doubt about it.

Those are sort of the basic conclusions. And when you look at it probabilistically, which I think is the only intelligent way to look at anything which you have any uncertainty about, what you realize is that the numbers that are being represented by all of these companies as “truth” are probably like the P-5 case, having a 5 percent probability of being true. So they say, “well, our average well in the Haynesville is going to be 7 Bcf,” and I say there will certainly will be wells that make 7 Bcf but there’s no way that the average is that high. My take is that there will probably be 5 percent of wells that will make 7 Bcf.

I just think everybody is caught up in this. I have a slide where I say, you guys need to get over the love affair and get on with the relationship. You keep talking about how big it is and how great it is, but at some point you have to live together and that’s hard work. You have to be honest with yourself and with each other and you have to do some work. I just don’t think we’ve moved past the love affair.

One other important thing is the Barnett shale. We keep coming back to it because it’s the only play that has much more than 24 months worth of history. I recently grouped all the Barnett wells by their year of first production. Then I asked, of all the wells that were drilled in each one of those years, how many of them are already at or below their economic limit? It was a stunning exercise because what it showed is that 25-35% of wells drilled during 2004-2006-wells drilled during the early rush and that are on average 5 years old-are already sub-commercial. So if you take the position that we’re going to get all these great reserves because these wells are going to last 40-plus years, then you need to explain why one-third of wells drilled 4 and 5 and 6 years ago are already dead.

Read the whole thing at ASPO-USA’s website!

Sharon

Comments

  1. #1 NM
    July 26, 2010

    Maybe you are already familiar with this, but there’s a pretty horrific documentary film about the results of natural gas drilling using hydraulic fracturing, and its effect on local wells and water supplies (the water becomes inflammable) … and health effects. It’s called Gasland, by Josh Fox.
    Anyway, it would highly elevate my own NIMBY-ism.

  2. #2 et
    July 26, 2010

    Also make sure there are no minerals under your & neighboring land.

  3. #3 Jim Thomerson
    July 26, 2010

    Do you own the mineral rights to your land? If not, you may be in for a nasty surprise. My mother used to refer to oil lease money as “found money”. We never got drilled on.

  4. #4 Sharon Astyk
    July 27, 2010

    We do own the mineral rights to our land, but not, sadly to the large chunk of land across the road that just went up with survey ribbons. I think it is far more likely that we’ll get more houses than a gas operation, but still…

    Sharon

  5. #5 Ed
    July 28, 2010

    I have been wondering about the amount of recoverable gas available in the Marcellus Play.
    Even without any of the more extreme problems that could occur (widespread groundwater contamination, methane leaks etc), any hydrofracking operation is going to use a tremendous amount of water and some blowback is inevitable. Considering the source black shale often has disseminated pyrite (iron sulfide) there would always be some level of acid mine drainage occurring.
    If the recoverable amount of gas is indeed low, then there would be a considerable amount of low-term damage done for little gain.

  6. #6 Frank Gifford
    April 6, 2011

    Need any further proof of the insanity of the human species? Hydrofracturing. This is absolute insanity.

  7. #7 NJ
    April 6, 2011

    Ed @ 5:

    Considering the source black shale often has disseminated pyrite (iron sulfide) there would always be some level of acid mine drainage occurring.

    Actually, unless the shale crops out at the surface or is brought to the surface, that should not be a problem. There are 3 necessary ingredients for AMD: Fe sulfides, water and oxygen. The organic material in the shales would maintain reducing conditions down hole and keep the pyrite (or marcasite) intact.

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