BRIEF-Alberta Energy Minister says Encana Corp was preparing to move since 2015

Alberta Energy Minister Sonya Savage, speaking at a news conference:

* ALBERTA ENERGY MINISTER SAYS SHE DOES NOT EXPECT CANADA OIL DIFFERENTIALS TO CHANGE WITH ADDITIONAL RAIL SHIPMENTS

* ALBERTA ENERGY MINISTER SAYS ENCANA CORP WAS WORKING TOWARD MOVING HEAD OFFICE SINCE 2015