Sumatra, Sunda Shelf, Natuna - Bibliography of Indonesia Geology

II.3. Natuna
The Natuna area forms the N edge of the Sunda shelf. Geologically it may be viewed as a westerly
continuation of the Cretaceous active continental margin of NW Borneo with a basement of
metamorphic-accretionary complexes and granites.
Natuna island is on the N-S trending Natuna Arch basement high, which is part of the non-extended
Sunda Shelf. Its core is composed of intensely folded Jurassic- Cretaceous Bunguran Fm deep
water clastics and volcanics with radiolarian cherts and gabbros-serpentinites, and is very similar to
the 'Danau Fm' of C Kalimantan (Bothe 1928). It is intruded by Late Cretaceous granites, one of
which forms the highest mountain on the island (Mt. Tanai; 1035m). This basement complex is
unconformably overlain by thin Oligocene- Miocene fluvial sediments.
The Natuna islands are bordered on three sides by Oligocene rift basins, the Malay- W Natuna basin
in the West, The South China Sea in the North and the E Natuna basin in the East.
Most of the 80 publications on the Natuna area are on oil and gas exploration and fields in the West
and East Natuna basins. The West Natuna Basin is connected to the larger Malay Basin.
Exploration and production focused on Late Oligocene- Miocene fluvial-deltaic clastic reservoirs,
mainly in young (~Late Miocene) inversion structures.
The East Natuna basin was not affected by the young inversion tectonics. It contains large E-M
Miocene reefal buildups, some of which are gas bearing, typically with high CO2 content.
Suggested reading
Geology: Bothe (1928), Haile (1970, 1971), Pupilli (1973), Franchino (1990),
Harahap & Wiryosujono (1994), Hakim & Suryono (1994, 1997),
Hakim (2004)
W. Natuna Basin: Wongkosantiko & Wirojudo (1984), Daines (1985), Ginger et al. (1993),
Fainstein & Meyer (1997), Phillips et al. (1997), Gunarto et al. (2000),
Maynard et al. (2002), Morley et al. (2003), Hakim et al. (2008)
E. Natuna Basin: Sangree (1981), Kraft & Sangree (1982), Franchino & Viotti (1986),
Rudolph & Lehmann (1989), Dunn et al. (1996), Bachtel et al. (2004)
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Bibliography of Indonesia Geology v. 4.1 4 www.vangorselslist.com July 2012