what are Supply and demand determinants and how does it effect oil and gasoline production and prices in canada?

what are the causes of reduced oil production in canada around 2016 example the Fort Mcmurray fire that started in 1 may 2016.

reference graphs:

for oil :

https://www.naturalgasintel.com/canadian-producers-win-early-victory-to-halt-enbridge-mainline-long-term-oil-contracts/

for gas:

https://www.statista.com/statistics/444194/average-retail-price-for-regular-unleaded-gasoline-in-canada/