Arun Field, Sumatra (Miocene of Indonesia)

Also known as Reef 787

Where: Indonesia (5.1° N, 97.3° E: paleocoordinates 2.7° N, 100.5° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Early/Lower Miocene (23.0 - 16.0 Ma)

• middle Lower Miocene, perhaps ranging into middle Miocene

• group of beds-level stratigraphic resolution

Environment/lithology: reef, buildup or bioherm; lithified reef rocks

• The Arun field is a giant gas-condensate field operated by Mobil and Pertamina with over 20,000 acres of closure at the top of the Arun reservoir.
• A middle-shelf patch reef complex of early to middle Miocene age is the producing facies at the Arun field. About 1,100 ft of porous limestones, encased in shales, create a stratigraphic trap for overpressured hydrocarbons. Three main carbonate lithologies were encountered during the examination of over 4,300 ft of core: (1) a reef facies consisting of vuggy, coral encrusting, red-algal boundstones, (2) a near-reef facies consisting of foraminiferal, mixed-skeletal packstones with gravel-size coral fragments, and (3) an interreef lagoonal facies consisting of benthonic-foram packstones.

Size class: macrofossils

Collection methods: core, peel or thin section,

Primary reference: C. F. Jordan, Jr. and M. Abdullah. 1992. Arun Field Indonesia, North Sumatra Basin, Sumatra. In N.F. Foster and E.A. Beaumont (eds.), Atlas of Oil and Gas Fields, Stratigraphic Traps III, AAPG, Treatise of Petroleum Geology 1-39 [W. Kiessling/W. Kiessling/J. Alroy]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 86769: authorized by Wolfgang Kiessling, entered by Wolfgang Kiessling on 17.02.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Pholadida - Teredinidae
Kuphus sp. Guettard 1770 clam
calcified tube around the siphon
Anthozoa
 Scleractinia - Poritidae
Alveopora ailingi stony coral
accessorial reef builder
Alveopora fenestrata Lamarck 1816 stony coral
secondary reef builder
Porites sp. Link 1807 stony coral
secondary reef builder
Porites cf. lutea Milne-Edwards and Haime 1851 stony coral
major reef builder
Porites solida Forskal 1775 stony coral
secondary reef builder
Goniopora stuchburyi stony coral
secondary reef builder
 Scleractinia - Agariciidae
Pavona varians Verrill 1864 stony coral
accessorial reef builder
Leptoseris hawaiiensis Vaughan 1907 stony coral
secondary reef builder
 Scleractinia - Astrocoeniidae
Stylocoeniella guentheri Bassett-Smith 1890 stony coral
major reef builder
 Scleractinia - Acroporidae
Montipora hispida Dana 1846 stony coral
accessorial reef builder
Acropora sp. Oken 1815 stony coral
several species, major reef builder
Astreopora myriophthalma Lamarck 1816 stony coral
major reef builder
 Scleractinia - Merulinidae
"Oulophyllia aspera" = Oulophyllia crispa, Caulastrea sp., "Favia stelligera" = Goniastrea stelligera, Cyphastrea microphthalma, Platygyra sp., "Favia speciosa" = Dipsastraea speciosa
"Oulophyllia aspera" = Oulophyllia crispa Lamarck 1816 stony coral
secondary reef builder
Caulastrea sp. Dana 1846 stony coral
accessorial reef builder
"Favia stelligera" = Goniastrea stelligera Dana 1846 stony coral
secondary reef builder
Cyphastrea microphthalma Lamarck 1816 stony coral
major reef builder
Platygyra sp. Ehrenberg 1834 stony coral
accessorial reef builder
"Favia speciosa" = Dipsastraea speciosa Dana 1846 stony coral
secondary reef builder
 Scleractinia - Faviidae
Anisocoenia crassisepta Reuss 1867 stony coral
accessorial reef builder
 Scleractinia - Mussidae
"Symphyllia nobilis" = Symphyllia recta
"Symphyllia nobilis" = Symphyllia recta Dana 1846 stony coral
accessorial reef builder
 Scleractinia - Oculinidae
Galaxea fascicularis Linnaeus 1767 stony coral
accessorial reef builder
 Scleractinia - Diploastraeidae
Diploastrea heliopora Lamarck 1816 stony coral
secondary reef builder