Calgary-based Daylight Resources has announced it is buying West Energy for $570 million. Daylight, a junior oil trust, said it wants to expand its holdings in the Pembina Cardium oil region of central Alberta. It said its intentions towards Calgary-based West intensified following WestÔÇÖs acquisition of assets formerly owned by Talisman Energy in January. About 90 per cent of West's assets lie in the Pembina oil field, where it has 10,360 hectares of oil rights. Pembina is located in the Cardium Formation, which was discovered in the 1950s.