It seems a lot of daily production has been removed just this weekend.
-BP shuts down their North sea field
-Exxon shuts down their Nigerian operations

I suppose the magnitude of the impact will be determined by the length of each shutdown.

Explosion at Indiana plant that turns coal into gas kills 2

http://news.yahoo.com/s/ap/20080428/ap_on_re_us/plant_explosion;_ylt=App...