The energy sector is full of niche players like Heckmann and CARBO Ceramics, but if you are looking for an under-the-radar company that is currently undervalued then you need to look at Denbury Resources. This tremendous company is the leader in tertiary oil recover and currently has more than 1 billion barrels of oil reserve potential. Trading at 1.6 times tangible book value, Denbury is about as cheap as they come. 

Denbury is a great value, but there are other players in this space that are positioned to soar as oil prices increasingly rise. If you're on the lookout for some currently intriguing energy plays, check out The Motley Fool's 3 Stocks for $100 Oil. You can get free access to this special report by clicking here.