Basically we rely on three sources of crude oil for consumption in Canada: conventional, unconventional (oil sands, offshore oil and shale oil) and imported oil.
Nova Scotia in a net importer of oil, although it does have a small amount of domestic production. Click here for production statistics.
Conventional and offshore oil is produced from wells. Oil sands are either surface mined or gathered from underground reservoirs. 
Click here to see a simple diagram of a traditional oil well.
Oil Consumption Canada-Wide
In 2010, production consumed 1,858,817 GJ and emitted 160,666 GHG tonnes.