Source: Bureau of Land Management A forest fire that started last Friday has shut down over 7% of Canada's oil sands output in Alberta. The 135,000 bpd Foster Creek oil sands development, which is 50% owned by Cenovus Energy (NYSE:CVE) and ConocoPhillips (NYSE:COP), has been turned offline. Canadian Natural Resources (NYSE:CNQ) had to shut down its 80,000 bpd Primrose project as well. Other facilities might get shut down as well if the fire isn't brought under control soon. This may end up boosting oil prices this week and will most likely close some of the differential gap [the difference in price] between Western Canadian Select [WCS], the price for Canadian heavy sour crude, and West Texas Intermediate [WTI], the pricing benchmark for most American crude. WCS has been valued at a substantial discount to WTI due to transportation constraints and aggressive supply growth. We will have to see how this plays out. Disclosure: The author, Callum Turcan, does not own any of the companies mentioned above. Always do your own due diligence before investing.