Medco?s oil and gas reserves update

The following table is PT Medco Energi Internasional Tbk?s contracts areas and gross proved plus probable reserve and net proved reserves for each of its production sharing agreements. The company has engaged independent consulting firm Gaffney, Cline and Associates, Inc (GCA) to review its Indonesian operated fields.

Notes:
(1) The Company does not produce in house estimates for net proved reserves.
(2) The Company's reserve estimates for the Senoro field of the Senoro-Toili JOB were certified in the GCA Report as of January 1, 2003 and restated in the GCA Report as of January 1, 2004. The Company's probable condensate and gas estimates for the Senoro field of the Senoro-Toili JOB were not certified by GCA in the January 1, 2005 GCA Report.
(3) The company's reserve estimates for the Lematang block (Singa gas field) are based on reserve data certified by other independent petroleum engineering consultants as of December 17, 2000. Production-to-date from the Lematang block has been negligible.
(4) The Company's reserve estimates for the Langsa block are based on the Company's estimates.
(5) The Company's reserve estimates for the Kakap block gas fields are based on operator's estimates.
(6) The Company's reserve estimates for the Brantas block gas fields are based on reserves data certified by other independent petroleum consultants as of November 1, 2003 for the Wunut field and as of September 21, 2004 for the Tanggulangin field, after deduction of production to December 31, 2004.
(7) The Company's reserve estimates for the Tuban block are based on reserve data certified by other independent petroleum engineering consultants as of December 31, 2003, after deduction of production from January 1 to December 31, 2004.
(8) The company's reserve estimates for the Middle East assets are based on Novus Petroleum's December 31, 2003 estimates after deduction for 2004 production.
(9) The Company's reserve estimates for the U.S. assets consisting of Padre Island, East Cameron, Main Pass, and Sorrento Dome blocks are based on Novus Petroleum's December 31, 2003 estimates after deduction for 2004 production.

Source: PT Medco Energi Internasional Tbk