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View Full Version : Marcellus Shale Study Reveals 167 Trillion Cubic Feet of Gas


Jay
08-05-2008, 12:24 PM
he Marcellus Gas Formation
The Next "Super Giant" Gas Field in the U.S.

"So did you hear about that huge natural gas field?" I asked politely, wondering in the back of my mind if he knew where the conversation was headed.

His reply was a little quicker than I had anticipated, "Yeah, I've been talking about the Barnett shale for a while now. I love it. I think it's the largest onshore gas field in the U.S."

The second I heard him mention the Barnett, I knew he had no idea what I was talking about. I didn't want to keep him in the dark for long.

Don't get me wrong, dear reader. I've been watching companies break through the Barnett shales for a while. Back in September, I suggested checking out Devon Energy (NYSE: DVN), which has jumped about 40% since.

Not too shabby.

They weren't the only ones that made investors happy, either.

After hearing my friend's response, I couldn't help giving him the news. I thought for a second before answering, "You might not want to say that last part just yet."

You see, the new Marcellus formation could make the Barnett shales look quite small in comparison.

The Marcellus Black Shale Formation

To be honest, I'm actually surprised that a number of my readers had no idea about the Marcellus formation.

The Marcellus formation is located in the Appalachian Basin and part of the Devonian black shales. It stretches from New York through Pennsylvania, Ohio, Maryland and West Virgina. The fact that natural gas is in the area isn't the question. In fact, the Appalachian basin has a long drilling history, going as far back as 1815. The Marcellus shales are found approximately a mile below the surface.

Although the region has been drilled countless times, it is still largely unexplored. We're talking about hundreds of thousands of wells that have been drilled in the Basin, yet the overwhelming majority were done at shallow depths.

One of the reasons the Marcellus shales are getting more attention is due to the horizontal drilling success on the Barnett shales. The technique isn't cheap. Drilling a horizontal well with hydraulic fracturing can be three times more expensive than a regular vertical well.

Let me put it this way, companies that are going to spend that much money are going make sure the well will produce. If the wells don't produce a substantial amount of natural gas, the company will end up losing money from drilling costs.

Okay, so how much natural gas are we talking about here?

Back in 2002, the United States Geological Survey (USGS) reported that only about 1.9 trillion cubic feet of natural gas was technically recoverable.

Well, things are about to change.

In December, 2007, two professors, Terry Engelder and Gary Lash, reported that the Marcellus shales could hold 167 trillion cubic feet of gas. And that was based on their conservative estimates. Their higher estimates suggested the formation could be as much as 500 trillion cubic feet. If you take into account a 10% recoverability factor, that comes out to almost 20 trillion cubic feet.

The potential is clearly there, but the question is, "Is the risk worth it?

Investing in Marcellus Shale Gas

Look, you don't need me to tell you there's a huge upside to Engelder and Lash's report. Even if their conservative estimates turn out to be correct, that's a lot of natural gas for the U.S. As you know, natural gas markets are regional (we'll leave liquefied natural gas out of this for now). As imports from Canada and Mexico decline, the U.S. could use the production boost to keep our up with our natural gas demand.

Personally, I'd look for some of your favorite Barnett plays to move into the Marcellus formation. Most of these companies have had tremendous success with horizontal drilling in Texas, why not make a move to an area with a stronger resource base?. Take a look at XTO Energy (NYSE, XTO), for example. Two weeks ago, XTO made their jump into the Marcellus play after paying $600 million to Linn Energy's Marcellus acreage.

Jay
08-05-2008, 01:10 PM
http://geology.com/articles/marcellus/marcellus-shale-map.gif
Thickness map of the Marcellus Shale. Modified after: United States Geological Survey, Open-File Report 2006-1237, Assessment of Appalachian Basin oil and gas resources: Devonian Shale-Middle and Upper Paleozoic Total Petroleum System, by Robert Milici and Christopher Swezey. [3]



http://geology.com/articles/marcellus/marcellus-shale-depth-map.gif
This map shows the approximate depth to the base of the Marcellus Shale. It was prepared using the map by Robert Milici and Christopher Swezey above and adding depth-to-Marcellus contours published by Wallace de Witt and others, 1993, United States Department of Energy Report: The Atlas of Major Appalachian Gas Plays. [4]



http://geology.com/articles/marcellus/marcellus-net-feet-organic-rich-shale.gif
A map of Pennsylvania showing the net feet of organic-rich shale in the Marcellus Formation. John Harper of the Pennsylvania Geological Survey believes that the thickness of organic-rich shale is more important than the total Marcellus thickness in assessing the production potential of a well site. [2] Map after Piotrowski, R.G. and Harper, J.A., 1979. [ 6]



http://geology.com/articles/marcellus/marcellus-stratigraphy-complete.gif
The stratigraphic nomenclature used for the rocks immediately above and below the Marcellus varies from one area to another. Information for Western Pennsylvania and Northwestern New York is shown above. Click the image to reveal nomenclature for other areas. Image by: Robert Milici and Christopher Swezey, 2006, Assessment of Appalachian Basin Oil and Gas Resources: Devonian Shale–Middle and Upper Paleozoic Total Petroleum System. Open-File Report Series 2006-1237. United States Geological Survey.[3]



http://geology.com/articles/marcellus/marcellus-gas-well.jpg
The most promising wells drilled into the Marcellus employ two technologies that are relatively new to Appalachian Basin gas shale production. One is horizontal drilling, in which a vertical well is deviated to horizontal so that it will penetrate a maximum number of vertical rock fractures. The second is "hydrofracing" (or hydraulic fracturing). With this technique, a portion of the well is sealed off and water is pumped in to produce a pressure that is high enough to fracture the surrounding rock. The result is a highly fractured reservoir penetrated by a long length of well bore.

Kurt_W
08-06-2008, 08:17 PM
We've been drilling Marcellus wells for several years now and compared to standard wells that have been drilled in the area, they are very good. I have heard that the horizontal wells drilled north of here are amazing.

That being said, our local region of WV has a major deliverability issue in that most of the transportation lines were abandoned many years ago. Those that are still in operation are a cobbled mess from the low price times and have inadequate throughput capacity. Quite a bit of money will need to be spent in order to reestablish the infrastructure to handle the onslaught of production the Marcellus can provide.

Jay
08-06-2008, 08:28 PM
CHK finished up a well not too awful long ago outside of the Moundsville area. I dont know the actual figure as far as production goes, but I know it's very high.

I got to go on a tour of the rig ect. It was pretty cool.
They explained how the bend is made for horizontal and stuff like that.
You can run more than 1 leg off of the horizontal well. The pic I posted shows 1 direction when in fact going 2 ways, in opposite directions is very common. Dont ask how that's done cause it was some complicated mess and I dont really remember all of it.