[crusty old prospector]

I believe Bakken crude is sweet.

[thackney]

There has been talk of some sour showing up.

http://www.petroleumnewsbakken.com/pntruncate/356656504.shtml

http://mobile.reuters.com/article/idUSL5N0EA3SU20130529?irpc=932

http://www.fool.com/investing/general/2013/06/04/is-the-bakken-turning-sour.aspx