Arun Field, Sumatra: Early/Lower Miocene, Indonesia

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Pholadida - Teredinidae
Kuphus sp. Guettard 1770
calcified tube around the siphon
Anthozoa - Scleractinia - Diploastraeidae
Diploastrea heliopora (Lamarck 1816)
secondary reef builder
Anthozoa - Scleractinia - Pocilloporidae
Stylocoeniella guentheri (Bassett-Smith 1890)
major reef builder
Anthozoa - Scleractinia - Acroporidae
Acropora sp. Oken 1815
several species, major reef builder
Alveopora ailingi
accessorial reef builder
Alveopora fenestrata (Lamarck 1816)
secondary reef builder
Astreopora myriophthalma (Lamarck 1816)
major reef builder
Montipora hispida (Dana 1846)
accessorial reef builder
Anthozoa - Scleractinia - Poritidae
Goniopora stuchburyi
secondary reef builder
Porites sp. Link 1807
secondary reef builder
Porites cf. lutea Milne-Edwards and Haime 1851
major reef builder
Porites solida (Forskal 1775)
secondary reef builder
Anthozoa - Scleractinia - Agariciidae
Leptoseris hawaiiensis Vaughan 1907
secondary reef builder
Pavona varians Verrill 1864
accessorial reef builder
Anthozoa - Scleractinia - Euphylliidae
Galaxea fascicularis (Linnaeus 1767)
accessorial reef builder
Anthozoa - Scleractinia - Lobophylliidae
Symphyllia nobilis (Dana 1846)
synonym of Symphyllia recta
accessorial reef builder
Anthozoa - Scleractinia - Merulinidae
Oulophyllia aspera Quelch 1886
synonym of Oulophyllia crispa
secondary reef builder
Caulastrea sp. (Dana 1846)
accessorial reef builder
Anisocoenia crassisepta Reuss 1867
accessorial reef builder
Favia stelligera (Dana 1846)
recombined as Goniastrea stelligera
secondary reef builder
Platygyra sp. Ehrenberg 1834
accessorial reef builder
Favia speciosa (Dana 1846)
recombined as Dipsastraea speciosa
secondary reef builder
Cyphastrea microphthalma (Lamarck 1816)
major reef builder
see common names

Geography
Country:Indonesia
Coordinates: 5.1° North, 97.3° East (view map)
Paleocoordinates:2.7° North, 100.5° East
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period:Neogene Epoch:Miocene
10 m.y. bin:Cenozoic 5
Key time interval:Early/Lower Miocene
Age range of interval:23.03000 - 15.98000 m.y. ago
Stratigraphy
Stratigraphic resolution:group of beds
Stratigraphy comments: middle Lower Miocene, perhaps ranging into middle Miocene
Lithology and environment
Primary lithology: lithified "reef rocks"
Lithology description: 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.
Environment:reef, buildup or bioherm
Geology comments: 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.
Taphonomy
Size of fossils:macrofossils
Collection methods and comments
Collection methods:core,peel or thin section,field collection
Reason for describing collection:general faunal/floral analysis
Metadata
Also known as:Reef 787
Database number:86769
Authorizer:W. Kiessling Enterer:W. Kiessling
Research group:marine invertebrate
Created:2009-02-17 01:54:02 Last modified:2009-02-17 03:54:02
Access level:the public Released:2009-02-17 01:54:02
Creative Commons license:CC BY
Reference information

Primary reference:
29212. 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]