Citation

Exon, N.F. & Ramsay, D.C., 1990. Distribution of Triassic Reefs in the Northern Exmouth Plateau and Offshore Canning Basin : (Project 121.23) BMR Offshore Sedimentary Basins Program. Record  1990/017. Bureau of Mineral Resources, Geology and Geophysics, Canberra.

Abstract

Petroleum exploration on the Exmouth Plateau has ceased, althoughthe giant Scarborough Gas Field has been retained by Esso-BHP.Research cruises by BMR's vessel "Rig Seismic" and the associated assessment of other data, indicate that the plateau still has petroleumpotential, but the combination of deep water and low oil pricesmilitates against further exploration at present. However, the Ocean Drilling Program (ODP) core drilling on theWombat Plateau, in the far north of the Exmouth Plateau area, showedthat Rhaetian (Latest Triassic) reefs are present there, one beingdrilled at Site 764 (Fig. 1). This discovery was the first of aTriassic reef in Australia, and indicates that suitable conditions forreefal development are likely to be widespread on the Northwest Shelf.The existence of Late Triassic reef complexes suggests a new petroleumexploration play, with the reefs forming traps, and lagoonal faciesperhaps providing oil source potential. BMR has recently suggestedthat there is a 50% chance of Triassic reefs hosting 60 million barrelsof undiscovered oil on the Northwest Shelf. BMR's Marine Division intends to assess the potential of suchreefs and other known Triassic and Jurassic shelf carbonates in twophases. The first is to map the known reef complexes on the WombatPlateau, and to see how far they can be extended along the northernmargin of the Exmouth Plateau and into the Canning Basin. The secondis to take our knowledge of their seismic character, and the bestseismic parameters for mapping them, into the outer Bonaparte Basinwhere Triassic carbonate sequences up to 1000 m thick have beendrilled, but no reefs have yet been identified. The present project makes up the first phase of work, on thenorthern Exmouth Plateau. It is proposed that a 34 day cruise of "RigSeismic" be carried out in early 1990. This cruise should result inthe acquisition of 2500 km of multichannel seismic profiles on thenorthern Exmouth Plateau, about 15 dredges aimed at Triassic andJurassic carbonates, and up to 5 cores. The cruise and its post-cruisefollow-up work aim to (i)Map the extent of and facies changes within the Triassic/Jurassic carbonates in and south of Wombat Plateau, andin the Rowley Sub-basin of the southwestern Canning Basin, usingseismic profiling and dredging techniques. (ii)Define the extent, character and petroleum potential of any Triassic or Jurassic reefs found. (iii)Use the cruise results, along with other data, to help assessthe petroleum prospects of Mesozoic reef plays elsewhere on theNorthwest Shelf. (iv)Better define the geological history of the northern Exmouth Plateau and the adjacent southwest Canning Basin.
Google map showing geographic bounding box with values North bound -15.0 East bound 119.0 West bound 111.0 South bound -22.0
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Product Type/Sub Type

dataset - GA Publication - Record

Constraints

license
Creative Commons Attribution 3.0 Australia Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

1990

Product Type

dataset

Topic Category

geoscientificInformation

Keywords

GA Publication
Record
marine
petroleum exploration
stratigraphy
geology
sedimentary basins
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

North bound
-15.0
East bound
119.0
West bound
111.0
South bound
-22.0

Lineage

Legacy product, lineage not available

Digital Transfer Options

onLine

DISTRIBUTION Format

pdf

Distributor

Role
distributor
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address

Metadata File Identifier

a05f7892-7577-7506-e044-00144fdd4fa6

Metadata Standard Name

ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

Metadata Standard Version

1.1

Metadata Date Stamp

1999-08-10

METADATA SECURITY CLASSIFICATION

unclassified

Metadata Contact

Role
pointOfContact
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
Downloads
For information on acquiring this product,
please contact the Geoscience Australia Sales Centre via:

fax:
+61 2 6249 9960; or
phone:
1800 800 173 (within Australia);
 
+61 2 6249 9966 (outside Australia).

Please note that support hours are 9 am to 5 pm weekdays