The Nexen building is seen in downtown Calgary, Alberta, in this July 23, 2012 file photo. Sinopec Group wants to sell part of its two largest shale gas plays in Canada to spread the massive cost and ... more 
The Nexen building is seen in downtown Calgary, Alberta, in this July 23, 2012 file photo. Sinopec Group wants to sell part of its two largest shale gas plays in Canada to spread the massive cost and accelerate development of the resource, as the Chinese energy giant focuses increasingly on return of investment, an executive said. In the wake of China CNOOC Ltd's landmark $15.1 billion acquisition of Nexen earlier this year, the Canadian government has raised the bar for future acquisitions by state-owned enterprises of its vast oil sands reserves, limiting them to minority stake holders. To match Exclusive SINOPEC-CANADA/ REUTERS/Todd Korol/Files (CANADA - Tags: BUSINESS ENERGY) less 
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Reuters | Photo By TODD KOROL / Reuters
Fri, Oct 25, 2013 2:20 AM EDT