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The AAPG/Datapages Combined Publications Database

Southeast Asia Petroleum Exploration Society (SEAPEX)

Abstract


Offshore South East Asia Conference, 1978
Pages 29-39

The Petroleum Geology of the Tembungo Field, East Malaysia

A. P. Whittle, G. A. Short

Abstract

Sabah’s first developed offshore field located in the Brunei-Sabah Basin of East Malaysia was discovered in 1971 by Esso Exploration. The field is 47 miles northwest of Kota Kinabalu, in 277 feet of water. Following the Tembungo No. 1 discovery well, four delineation wells were drilled prior to locating an 18 slot production platform near the crest of the Tembungo anticline in mid 1974.

Oil and gas are reservoired in discontinuous turbidite sands deposited in bathyal waters during Late Miocene time. The sulphur free oil has a gravity of 38° API @ 60°F and porosities in the sands average 20–25% with permeabilities in the order of hundreds of millidarcies. The wrench related shale supported anticline is complexly faulted. Hydrocarbon contacts in neighbouring faults blocks appear unrelated indicating the faults are sealing. Multiple hydrocarbon contacts are also present in the same fault block. Relatively poor ultimate recoveries are expected due to the predicted solution-gas drive mechanism. Below the Tembungo turbidites abnormally pressured formations have been encountered.

To date, (July 1977) development/exploration wells have been drilled through twelve conductors. Six wells are currently on production with a current production rate of 12000 BOPD. Cummulative production exceeds 4 million barrels. Platform conformable reserves are approximately 15 million barrels.


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