The Northwest Java basin deepens towards the Bogor trough in the south, abutting the volcanic arc Figure A middle to late Miocene second rifting phase is also proposed by Keetley et al. Peutu and Belumai formation carbonates represent the main play type in the North Sumatra basin and the Peutu is volumetrically the most important reservoir facies in the basin. Syn-rift Eocene—late Oligocene An early stage of Paleogene rifting is recognized from onshore fieldwork and offshore seismic and gravity surveys Howles, ; Mulhadiono and Asikin, ; Hall et al. The back-arc basins There are 17 Tertiary back-arc basins and inter-basins in Western Indonesia and the majority are considered submature or mature with respect to hydrocarbon exploration. Tertiary development includes a major inversion event, and at least two major episodes of volcanism. The basin is predominantly offshore with water depths reaching over m in the Lombok sub- basin, and covers a total area in the region of , km2.
Sag late Oligocene—early Miocene The late Oligocene to early Miocene was marked by transgression as a result of thermal sag and eustatic gain. A Geological Overview of Indonesia Chapter 4 2. Western Indonesia represents the southeast margin of the Sunda shield and Eastern Indonesia represents the highly fragmented and tectonized northern margin of the Australian craton. Although there are gross geological similarities between the Western Indonesia basins, there are also significant geological differences.
Plate tectonic models for the region have continuously been refined since the first model was developed for Western Indonesia by Katili This information in some ways fuels optimism for the existence of economic petroleum reserves in the Western Indonesian fore-arc.
Basement time structure map of Northwest Java sub-basins above and location of hydrocarbon fields below after Noble et al. Reservoirs are commonly fractured and lacustrine shales are the main oil source to the east in the Jatibarang sub-basin Noble et al.
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Late stage faulting also created vertical migration pathways to supply the younger sand reservoirs. The basin is notable for the first commercial oil field in Indonesia — the Telaga Said field discovered in — and the giant Arun gas field.
Northwest Java basin The Northwest Java basin lies roughly equally in an onshore and shallow-offshore setting see Figure 226 photograph shows terrestrial oil-prone source facies dominated by cutinite C and other land plant material. Tidak epsode kita dapat Weekly Highlights – EP. It consists of Eocene and younger shallow marine sands and shales, reefal carbonates, younger turbidites interpreted as accreted trench fill, and ophiolitic gabbros and ultramafic rocks harzburgites.
Bulk reservoir properties are highly variable but often good e. Simplified map of structural elements and hydrocarbon occurrence in the Sumatra fore arc modified from Yulihanto et al.
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Syn-rift middle Eocene—late Oligocene Eocene to early Oligocene tilting led to the development of the Seribu platform and the Northwest Java mxsalembo, which masqlembo towards the Bogor trough in the south.
The eastern part of Asri sub-basin is sparsely drilled. KGUN9 12 years ago. Diperoleh dari ” https: Generalized structural pattern of the Southern Sumatra region after Yulihanto and Sosrowidjoyo, Tertiary development includes a major inversion event, and at least two major episodes of volcanism.
Collision of the Australian craton with the Asian plate starting at about 8 mybp and continuing until major collision at about 3 mybp; and collision of the Eplsode arc west of the Philippines with the Asia plate margin near Taiwan at about 5 mybp.
Thick, paralic, oil-prone coals are of particular importance as source rocks in the elisode northerly Ardjuna sub- basin Noble et al. Turbidite fan sands in the Southwest Java basin also demonstrate excellent reservoir potential. Even though Sihapas deposition mzsalembo considered to have occurred during a period of relative quiescence, north—south right- lateral faulting was active throughout and produced early Miocene pull-apart basins. This is already being realized. Third- and even fourth-order eustatic events are often recognizable on a basin-wide scale.
The prolific, deep, lacustrine Brown 226 formation algal-rich laminites of the graben center are thought to have been the source of almost all the oil in the Central Sumatra basin Williams et al.
SlideShare Explore Search You. These works indicate a range of important organic source facies for the Western Indonesia basins Figure 10 including marine, terrigenous fluvio-deltaic of Robinson, and lacustrine. Singkel 1 — Union Oil 3. This was succeeded by the deep marine Belumai shales, which may be a secondary source for gas in the Arun field.
The Asri sub-basin remains prospective to this day. In the east it connected with the Pacific Ocean intra-oceanic-arc system. Fieldwork in the outer-arc ridge Mentawai Islands and regional seismic demonstrate that the marine Oligocene graben fill in the Mentawai basin has source potential.
It is feasible that these grabens, which strike northeast—southwest, represent an extension of the early South Sumatra basin rift system prior to the development of the more recent volcanic arc.
Uplift Pliocene—Pleistocene Starting in the early Pliocene and continuing through to the Present-day, basin uplift and volcanism have been prevalent accompanying the development of the Barisan Mountain chain.
Maszlembo was, with about 14 TcfG and MBC million barrels condensatethe largest gas field in Southeast Asia until it was superseded by the supergiant Natuna Alpha gas field. It would appear that there are few new play types in the Central Sumatra basin. The middle Eocene—middle Oligocene Jatibarang formation consists of interbedded volcanics, volcaniclastic sands and lacustrine shales, which represent the initial basin fill. Belumai buildups are abundant and clearly visible on seismic shot over the Malacca platform.