Aug 1 (Reuters) - Canadian oil producer Imperial Oil IMO.TO posted a fall in second-quarter profit on Friday, driven by lower upstream realizations and downstream margin capture.

The Calgary, Alberta-based company said its net income fell to C$949 million ($684.31 million), or C$1.86 per share, in the quarter ended March 31, from C$1.13 billion, or C$2.11 per share, a year earlier.

($1 = 1.3868 Canadian dollars)

(Reporting by Katha Kalia in Bengaluru; Editing by Shinjini Ganguli)

((Katha.Kalia@thomsonreuters.com;))