ATP High Bidder on Four Gulf of Mexico Blocks

ATP Oil & Gas was the apparent high bidder on four out of four blocks at the August 20, 2003 OCS Western Gulf of Mexico Offshore Lease Sale 187. The Sale was held in New Orleans by the Minerals Management Service (MMS). ATP will own a 100% working interest and serve as operator if ATP's high bids are approved by the MMS. The blocks, with proved reserves, are located in approximately 160 to 350 feet of water.

The Company previously announced it had exceeded 200% reserve replacement year-to-date prior to being the high bidder on all four properties on which it bid. "These quality properties, coupled with our previously announced 2003 acquisitions continue to enhance our strong Gulf of Mexico acreage holdings and these four blocks are located in close proximity to ATP infrastructure," said Gerald W. Schlief, ATP's Senior Vice President.