CALGARY — French energy giant Total says it is writing off $9.3-billion (US$7 billion) worth of oilsands assets in Alberta and cancelling its membership in the Calgary-based Canadian Association of Petroleum Producers (CAPP). Total now considers oil reserves with high production costs that are to be produced more than 20 years in the future to be “stranded” given its carbon reduction targets and because the resource may not be produced by 2050, the Paris-based company said Wednesday.