Investor Presentaiton

LEMIGAS GEOLOGY OF the NORTH SUMATERA BASIN NORTH SUMATERA BASIN North Sumatra Basin Fore-Arc Basin Fore-Arc Ridge Accretionary Wedge 2° N Malaysia Sunda Craton Asahan Argh Barisan Mounta AM SH A4 Tigapuluh High South Sumatra Basin 2° N- ➤ North Sumatera basin is a back-arc basin that occupies an area of 60,0000 sq. km in the offshore and onshore area of the Northwestern part of Sumatera island This basin is known as prolific hydrocarbon bearing basin in western Indonesia and produces oil and gas. Sunda Basin Central Sumatra Basin ntains Mentawai Fault Active subduction Zone Sumatra Fault Top of Melange Wedge Toe of Melange Wedge Relative Plate Motion N6°E Sunda Trench A Active Quaternary Volcanoes 0 100 200 300 400 500 km Approximate Scale 98° E Lampung High ΔΔ 4 Pertamina - C&T P.S.C Coastal Plains Block 105° E W. Java Basin 8° S Hydrocarbon Exploration history began in the late 19th century. The first oilfield in the North Sumatera Basin is Telaga Said oilfield (1885). The discovery was followed by Darat oilfiled (1889), Perlak (1900), Serang Jaya (1926), Rantau (1929), Gebang (1936 and Palu Tabuhan (1937). The most significant field in the basin today is Arun gasfield which was discovered in 1971. Total initial reserves of this field was estimated to be 17 TCF. Java Trench

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