GEOLOGICAL SOCIETY OF THE PHILIPPINES

PETROLEUM SYSTEMS AND PLAYS OF BORNEO AND PALAWAN

 

Richard W. Murphy
Weybridge, Surrey, UK

 

        Nine major petroleum systems in the eight significant basins of Borneo and Palawan contain 23-26 BBOE of discovered hydrocarbons. Plays may be viewed as those containing major fields (>50 MMBOE), minor fields (<50 MMBOE), plays that donít work and frontier plays. They may be further subdivided by trap type, basin setting (delta sag or rift/sag), by reservoir (sandstone or carbonate) and by environment (shelfal or turbidite).

        The nine petroleum systems are:

 

  1. Middle Miocene to Pliocene sandstone reservoirs in a variety of structural and structural-stratigraphic traps in the Sabah Basin.
  1. Upper Miocene to Pliocene deltaic sandstone reservoirs in shallow, faulted, four-way anticlines in the Tarakan Basin.
  1. Oil and gas in very large quantities in long, parallel, unfaulted north-south-trending anticlines in the Mahakam Delta. Reservoirs are west-east-trending channel sandstones.
  1. Oil and gas in deep water Makassar Sea outboard of the producing shelf with turbidite sands as the reservoir and associated ponded deep water marine shales as the source.
  1. Oil in upthrust anticlines in the Tanjung Raya area of the Barito Basin
  1. Oil and gas from Cycle II and III deltaic sandstone reservoirs in complexly faulted structures in the Balingian Province.
  1. Huge amounts of gas and minor amounts of oil from Cycles V and IV reefs and platform carbonates on the Luconia Shoals microcontinent.
  1. Large reserves of oil and gas from Cycle V and VI deltaic and turbidite reservoirs in the Baram and Champion deltas in a variety of complexly faulted structural traps.
  1. Oil and gas in reefs flanking a rift source basin on the North Palawan microcontinent.
 
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