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The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
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The Badak field lies on the east coast of the island of Kalimantan (Borneo), Indonesia, about 22 mi (35 km) south of the equator. The Badak 1 discovery well was spudded on November 27, 1971, and completed on February 11, 1972. The well penetrated more than 1,000 ft (305 m) of net gas sandstone and about 120 ft (37 m) of oil sandstone. Drilling of Badak 1 was preceded by an exploration program, which started in December 1968 and 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 wedge of upper Tertiary clastic sediments 20,000 ft (6,096 m) thick, deposited in the 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 50 mi long (80 km), north-trending structural axis, which also connects the Nilam and Handil fields to the south. The Badak culmination is a gentle anticlinal uplift with no known faults.
The Badak field has in-place reserves of more than 7 Tcf of gas, 130 million bbl of condensate and 60 million bbl of oil. It now produces 500 MMcf of gas, 15,000 bbl of condensate and 10,000 bbl of oil per day.
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