The one thing you see in the energy section of any news publication is the price of oil. Most of the time, it will give some doom-and-gloom reason that has little to do with the price of oil, or it will be some analysts making claims that oil will be double what it is today, or that it will drop 20%-30%. The most fascinating part of these prognostications is that they rarely give any real reason. A great example is a quote from Peter Flynn in an interview with Bloomberg, where he gives his reason that oil prices are going to drop:

We've crossed the Rubicon when we crossed that $100-a-barrel threshold; now the fundamentals are heavy, and people are starting to try to protect their oil position on the downside.

It sounds as if he's saying is oil prices are going to drop because people are afraid they'll drop, and that the sacred number of $100 is the tell-all sign. So the reason oil prices will drop has no correlation with what's going on in at the oil fields or at the gas pump -- just "heavy fundamentals." Does anyone understand what "heavy" fundamentals even means?

There's a reason oil prices in the U.S. could drop and bring the nation's oil boom to a screeching halt, and it's easier to understand than "heavy fundamentals." Let's look at what this very real threat and what we can do to prevent it. 

The cork in the bottle
The U.S. oil boom has resulted in a massive uptick in light, sweet crude production. This has been a dream for refiners, because these types of oil typically command the highest prices and cheaper, domestic sources have taken a large chunk off their feedstock bills. But U.S. refiners need more than light, sweet oil, and the nation is coming very close to its total refining capacity for this type of oil.

Crude Imports By Type

Source: U.S. Energy Information Administration.

And here's where the problem lies.

Since the oil embargo of the 1970s, the U.S. has banned the export of domestic crude. Up until now, no one probably noticed, but within the next 12 months, light, sweet crude production could outpace refinery capacity. If this were to happen and the U.S. were to maintain its export ban, then we could see a severe drop in oil prices as producers fight to get their crude in the door at U.S. refiners. 

The first victims
Each shale play in the U.S. is unique, and all of them have different economics, so let's do a comparison of three major shale and tight oil drillers in the U.S. -- EOG Resources (NYSE:EOG), Pioneer Natural Resources (NYSE:PXD), and Continental Resources (NYSE:CLR). Each of these three companies more or less represents one of the nation's three major shale oil formations. EOG is the top driller in the Eagle Ford, and Continental in the Bakken. Pioneer's largest production comes from the Permian Basin. 

CompanyRealized Prices for Oil (Q2 2013)Cash Margin Per Barrel of Oil Produced (Q2 2013)
EOG Resources $103.73 $40.25
Continental Resources $88.50 $52.51
Pioneer Natural Resourcces $90.82 $37.50

Source: Company presentations and 10-Qs.

Even though the price for oil is about $100 in the U.S., that doesn't mean companies are all able to realize that price. The issue with the Bakken is that its location makes transportation costs greater, and therefore the price realized at the well is less than, say, EOG's resources in the Eagle Ford, which is the next-door neighbor to the heart of America's oil refining capacity. At the same time, though, the well economics in the Bakken make for very attractive cash margins, and it's not unique for Continental. Kodiak Oil & Gas (NYSE:KOG) has cash margins on its production -- which all comes from the Bakken -- of greater than $61 per barrel produced. 

In the event that we were to reach the light, sweet crude refining capacity and no crude exports were allowed, it's very likely that all oil prices would fall, and it's also very possible that places such as the Permian and the Eagle Ford could see the biggest difference in price. Both of these regions primarily supply Gulf Coast refiners, while the Bakken has the ability to move more than 1 million barrels per day via rail, which could serve the East Coast and West Coast refiners more easily. 

Using the prices realized on crude, the amount of money that can be made per barrel of crude, and the current flows of oil, it's possible that some of the disadvantaged regions in the Permian and Eagle Ford could be some of the first regions to see major downturns in production and profitability if oil prices were to decline. 

What a Fool believes
When looking at investing in U.S. oil and gas for the long term, rarely should you take the prophecies of oil-price oracles into consideration. There are, however, some real market drivers that could affect price, and it's those that you should keep an eye on. The ability for the U.S. to export light, sweet crude is one of those drivers. If we were to be able to start exporting oil as the market commands, then a severe drop in domestic oil prices is not as likely. If we were to maintain the course we're on, though, we could see some companies, including EOG and Pioneer, suffer because of it.

Fool contributor Tyler Crowe has no position in any stocks mentioned. You can follow him at Fool.com under the handle TMFDirtyBird, on Google +, or on Twitter, @TylerCroweFool.

The Motley Fool owns shares of EOG Resources. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.