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Home Studies Tarakan Basin

 Tarakan Basin

GIS-based G&G Database and Report

Tarakan Basin 01

GIS G&G Project and A3 Hard Copy Report.


A Petroleum Systems Evaluation of the Tarakan Basin, Indonesia.

The ‘GIS G&G Regional Database for the Tarakan Basin’ contains multiple interpretational layers and G&G datasets, as detailed below:

  • Georeferenced maps, figures and images.
  • Hyperlinked images of seismic, interpreted seismic and cross sections that illustrate overall basin/rift geometry, the relationship of essential play elements and key discoveries.
  • Detailed Base Tertiary Map generated from well tops and seismic data.
  • Tectonostratigraphic summary chart showing proven and potential essential play elements.
  • Play cartoons based on seismic.
  • Basin modelling and the generation of expulsion windows for oil and gas.
  • Gross Depositional Environment (GDE) and Play Maps.
  • Defined prospects and leads.

The Tarakan Basin is one of three major Tertiary age deltaic depocentres located around the margin of Kalimantan in eastern Borneo. Seventeen (17) fields are currently in production or shut-in, the largest of which were discovered before World War II. Almost all of the production has occurred from delta plain sandstones along what have been described in the literature as NW-SE dip oriented ‘arches’ (Lentini and Darman, 1996). However, over the last few years major discoveries have been located in the deep water areas of the eastern basin – Tulip (2007) and Aster (2004) host hydrocarbons within lower slope, deep marine sandstones in around 1000m of water. Seismic data suggest that forced regressions resulted in the deposition of deltaic and turbiditic reservoirs downdip in the present day deep water areas. This new exploration fairway has significantly increased the hydrocarbon potential of a basin having a productive history dating from 1899. A recent discovery – Badik (2010) – lies within Upper Miocene deltaic sands on the edge of the shelf.

JMJ Petroleum has now undertaken several major proprietary (exclusive) studies in the Tarakan Basin, ranging from onshore field mapping, tectonostratigraphic mapping, basin modelling, play fairway mapping through to the identification and evaluation of prospects and leads. This has provided an invaluable insight into the petroleum systems of different parts of the basin.

The Tarakan Basin can be divided into four sub-basins:

  1. Muara Sub-basin, the southernmost depocentre developed exclusively offshore. The NW-SE trending
    • Muara Sub-basin is bound to the SW by a coast parallel wrench fault zone along the northern Mangkalihat Peninsula. Towards the NE, the sub-basin is bounded by the strike-slip Maratua Fault Zone, upon which the reefs of the Maratua Islands have developed. Seismic data suggest the presence of up to 5kms of Oligocene to Recent rift and passive margin sediments resting on older volcanics, with little structuration present in the post Lower Miocene section. The Eocene rift section probably contains source rocks, with predominantly carbonate reservoirs throughout the Tertiary section.

  2. Berau Sub-basin, mostly onshore and located in the south.
    • The Berau Sub-basin is bounded to the north and south by Pre-Tertiary outcrop; the southern margin is the igneous Suikerbrood Ridge. To the east, the basin extends into the Tarakan Sub-basin. The division between the Tarakan and Berau sub-basins is based on the westward pinch-out of the Pliocene Tarakan Formation. Several NNW-SSE trending compressional features are present - this structuration is related to left lateral movement along wrench zones accommodating the ongoing widening of the Makassar Strait, such as the Maratua Fault Zone, which forms part of the sub-basins NE boundary.

  3. Tarakan Sub-basin, predominantly offshore including Bunyu and Tarakan Islands.
    • The thick clastic fill in the Tarakan Sub-basin is an amalgamation of Middle Miocene to Pleistocene clastic depocentres located below Bunyu and Tarakan islands which prograde into the deep offshore. The Pliocene thins regionally to the west and south, onlapping Miocene highs and eventually pinching out.

  4. Tidung Sub-basin, the most northerly basin and mainly onshore.
    • The Tidung Sub-basin is separated from the Tarakan Sub-basin to the east by the Major Regional Normal Fault (Hidayati et al., 2007). The sub-basin contains thick Eocene to Mid-Miocene sediment fill with the Upper Tertiary thinned through erosion. Tightly folded anticlines and flower structures are present; thrusting also occurs along the coast. In the northeast, the sub-basin is bound by the Semporna Fault Zone, which exhibits sinistral transform movement, whilst the southwestern boundary is thought to be the sinistral Sibuda Fault Zone (Cullen, 2010).

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