• ATP Oil & Gas Corp. , Houston, plans to purchase two North Sea properties with proved undeveloped reserves from BP for an undisclosed amount. The deal includes BP's 100% interest in the Block 47/10-discovery area, which surrounds the 47/10-1 discovery made by BP in 1984. The second property is BP's 50% interest in the Venture Field, which identified proved reserves by a well drilled in 1974. Conoco is the owner of the remaining 50% interest in the Venture Field. Both properties are in less than 120 feet of water. • Evergreen Resources Inc., Denver, plans to acquire a 100% working interest in 605,000 acres of prospective tight-gas sand properties in the northwest Carboniferous Basin, northern Ireland, from Denver-based Priority Oil & Gas LLC and S. Morrice & Associates Ltd. for less than 25,000 Evergreen restricted shares. The project holds large-scale reserve potential with unrisked recoverable reserves estimated at up to 5 trillion cu. ft. of gas. • Devon Energy Corp. , Oklahoma City, has increased its ownership in the Azeri-Chirag-Gunashli oil fields in the Caspian Sea, offshore Azerbaijan, by acquiring an additional 0.8% interest from Ramco Energy Plc for US$58.3 million. The acquisition increases Devon's interest in ACG from 4.8% to 5.6%.