Assessment of undiscovered conventionally recoverable petroleum resources of Indonesia
The estimates of undiscovered conventionally recoverable petroleum in Indonesia at probability levels of 95%, 5%, and statistical mean are for oil (in billions of barrels): 5, 35, and 16; and for gas (in trillions of cubic feet): 13, 94, and 42. In Indonesia, petroleum occurs in five types of basins: forearc, back-arc (foreland), median, inner-arc, and downwarp-into-small-ocean basins. The back-arc, median, and downwarp basins have significantly greater petroleum potential than do the fore-arc and inner-arc basins. The latter two types are expected to yield only small discoveries; also, significant portions of such basins lie in water depths in excess of 1000 m. The back-arc basins have been the most petroleum productive, but they also have been the most extensively explored. The greatest undiscovered petroleum potential is estimated to lie in the downwarp and median basins. In Indonesia, six general types of geological settings or plays have been identified as being favorable for petroleum accumulation. They are transgressive clastic sequences, regressive clastic sequences, deltas, carbonate platforms, pinnacle reefs, and fractured igneous and volcanic rocks. The multiple-pay transgressive clastic reservoirs in the back-arc basins have produced most of Indonesia's crude oil. In several basins, carbonate platform porosity has become a primary exploration target, but each reservoir (reef, bank, or bioclastic zone) tends to be restricted in size. Typically, Indonesian oil is of medium gravity with a paraffin base and has a moderate to high pour point, a low sulfur content, and relatively low gas to oil ratio. 18 references, 5 figures, 3 tables.
- Research Organization:
- Geological Survey, Alexandria, VA (USA); Library of Congress, Washington, DC (USA). Congressional Research Service
- OSTI ID:
- 5916013
- Report Number(s):
- USGS-CIRC-899; ON: TI85900599
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
INDONESIA
GEOLOGY
PETROLEUM DEPOSITS
PETROLEUM
RESERVES
PETROLEUM GEOLOGY
RESOURCE ASSESSMENT
NUMERICAL DATA
ASIA
DATA
DEVELOPING COUNTRIES
ENERGY SOURCES
FOSSIL FUELS
FUELS
GEOLOGIC DEPOSITS
INFORMATION
ISLANDS
MINERAL RESOURCES
RESOURCES
020200* - Petroleum- Reserves
Geology
& Exploration
580100 - Geology & Hydrology- (-1989)