It was only a matter of time before drilling machine XTO Energy (NYSE: XTO) put the moves on the Marcellus shale.

I first informed Fools about the industry's influx into this Appalachian acreage back in December. In short, the sedimentary rock layer known as the Marcellus shale, which stretches from West Virginia, through Pennsylvania, and up into Western New York, promises to pour forth a ridiculous amount of natural gas. Local producers like National Fuel Gas (NYSE: NFG) and Atlas Energy Resources (NYSE: ATN) found themselves fortunate to fall in the fairway, while shale mavens Range Resources (NYSE: RRC), Chesapeake Energy (NYSE: CHK), and EOG Resources (NYSE: EOG) have gone gonzo grabbing acreage.

Because XTO has less of an exploratory flair than the E&Ps mentioned above, the company took a little more time getting to know Mr. Marcellus. The two had dinner and engaged in polite conversation. Now they're ready to take the next step.

XTO has agreed to pay $600 million for Linn Energy's (Nasdaq: LINE) Appalachian assets. In addition to Marcellus prospectivity, these holdings include long-lived producing reserves and midstream infrastructure. This is exactly the sort of deal that XTO loves: picking up underdeveloped proven acreage with tremendous upside. The arrangement also makes a lot of sense for Linn; as a high-yielding limited liability company, it's not particularly well-suited for intensive capital expenditures.

So how much upside are we looking at here? In its press release, XTO cited Linn's figure of 2 trillion-4 trillion cubic feet of potential gas. I wouldn't be surprised if these shale-savvy guys surmise that there's even more in store. While this acquisition isn't transformative for XTO, which recently cited more than 11 trillion feet of low-risk upside potential, the purchase is a natural fit, and it ought to prove highly profitable.

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Fool contributor Toby Shute doesn't have a position in any company mentioned. The Motley Fool has a disclosure policy.