Investigation of Equipment Failure Green Canyon Block 242, Well No. 1 OCS-G 21788 September 5, 2004

Lease OCS-G 21788 covers approximately 5,760 acres and is located in Green Canyon Block 242 (GC 242), Gulf of Mexico, off the Louisiana Coast (for lease location, see Attachment 1). The lease was issued effective July 1, 2003. Nexen Petroleum Offshore U.S.A. Inc. is a 100-percent interest leaseholder and the Designated Operator to a depth of 25,000 feet true vertical depth (TVD), with British Petroleum Exploration and Production Company owning 100-percent interest below 25,000 feet TVD.