Oil Sheen in Gulf -- Bakken Related?

From Yahoo!InPlay:

6:48AM Royal Dutch Shell taking proactive measures as Gulf of Mexico sheen has been spotted: On April 11, Shell notified the National Response Center of a light sheen in the central portion of the Gulf of Mexico, between the Mars and Ursa production area. Shell has no current indication that the sheen originates from wells in either the Mars or Ursa projects. However, out of prudent caution, Shell has activated the Louisiana Responder, a Marine Spill Response Corporation vessel. At this time, the source of this sheen is unknown. 

Connect that dot with the problems going on off-shore Brazil and a theme is starting to develop: development of off-shore oil in western hemisphere is not going to be easy.