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The Badak field is located on the east coast of the Island of Kalimantan (Borneo), Indonesia, about 35 km south of the equator. The Badak 1 discovery well was spudded November 27, 1971, and completed on February 11, 1972. The well penetrated more than 900 ft (274 m) of net gas sand and about 300 ft (91.5 m) of oil sand.
Drilling of Badak 1 was preceded by an intensive exploration program, which started in December 1968 and which included aerial photographic and magnetic surveys, geologic field work, and reflection and refraction seismic surveys.
Geologically, the Badak field is a part of the Mahakam delta, a 6,000-m thick wedge of upper Tertiary clastic sediments, laid down in the major Kutai basin.
Badak reservoirs are coarse to very fine-grained quartz sandstones with an average porosity of 22% and average permeability of 200 md. The individual sand bodies are either channel-mouth or finger-bar sands deposited in a deltaic environment.
Structurally, Badak is one of several culminations formed on a long (60 km) north-trending structural axis, which also connects the Nilam and Handil fields on the south. The Badak culmination is a gentle anticlinal uplift with no known faults.
The Badak field, with reserves of 7 Tcf of gas and 160 million bbl of oil and condensate in place, now has daily production of 600 MMscf of gas, 15,000 bbl of condensate, and 10,000 bbl of oil.
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