OSLO Petroleum Geo-Services ASA Strandveien 4 PO.BOX 89 NO-1326 Lysaker, Norway Phone: +47 67 52 64 00 Fax: +47 67 52 64 64 HOUSTON Petroleum Geo-Services, Inc. 15150 Memorial Drive Houston Texas 77079, USA Phone: +1 281 509 8000 Fax: +1 281 509 8500 LONDON Petroleum Geo-Services (UK) Ltd. PGS Court Halfway Green Walton on Thames, KT12 Surrey, UK Phone: +44 1932 260 001 Fax: +44 1932 266 465 SINGAPORE Petroleum Geo-Services Asia #02-00 Thong Teck Bldg. 15 Scotts Road 22 82 18 Singapore Phone: +65 6735 6411 Fax: +65 6735 6413