Mesozoic evolution and exploration potential of the western Exmouth Plateau, Australia
- Univ. of Texas, Austin (United States)
- Bureau of Mineral Resources, Canberra (Australia)
A regional grid of seismic data across the western Exmouth Plateau combined with recent ODP drilling results (Sites 762, 763, and 766) provide new ideas about the sedimentary history, tectonic evolution, and exploration potential of the area. The outer plateau is underlain by a thick section of regionally tilted, block-faulted, largely fluvial-deltaic, late Paleozoic-Triassic sediments. These sediments grade westward into an acoustically transparent basement interpreted to be Late Triassic-Early Jurassic intermediate volcanics. The western plateau is flanked on the northwest and southwest by the Gascoyne and Cuvier ocean basins, respectively, formed during the Lower Cretaceous when Greater India separated from Australia. Thermal doming of the margins in earliest Cretaceous just prior to initial rifting provided a southerly source area for the Barrow delta as well as local source areas for a thick, Barrow-equivalent sandstone unit along the western margin. Continued local uplift of the western margin during initial rifting (Late Valanginian-Hauterivian) provided shallow water source areas of local clastic wedges that prograded both eastward onto the plateau as well as westward into newly formed deepwater rift basins. This was followed by rapid subsidence of the plateau and deposition of deepwater shales and carbonates during the remainder of the Cretaceous and Cenozoic. Inferred source rocks (gas ) in the Triassic section, abundant reservoir rocks in the Triassic and overlying Lower Cretaceous, and overlying Cretaceous and Cenozoic seal, plus several episodes of thermal activity make the regional high along the western margin of the Exmouth Plateau a possible target for future deepwater exploration.
- OSTI ID:
- 5787689
- Report Number(s):
- CONF-910403--
- Journal Information:
- AAPG Bulletin (American Association of Petroleum Geologists); (United States), Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States) Vol. 75:3; ISSN AABUD; ISSN 0149-1423
- Country of Publication:
- United States
- Language:
- English
Similar Records
Sequence stratigraphy on an early Cretaceous passive margin, Exmouth Plateau
Structure and sedimentary history of Exmouth Plateau
Related Subjects
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
58 GEOSCIENCES
580000 -- Geosciences
ALLUVIAL DEPOSITS
AUSTRALASIA
AUSTRALIA
CRETACEOUS PERIOD
DEVELOPED COUNTRIES
EXPLORATION
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FAULTS
GEOLOGIC FRACTURES
GEOLOGIC HISTORY
GEOLOGIC STRUCTURES
GEOLOGIC TRAPS
GEOLOGY
GEOPHYSICAL SURVEYS
MESOZOIC ERA
MINERAL RESOURCES
NATURAL GAS DEPOSITS
PETROLEUM DEPOSITS
PETROLEUM GEOLOGY
RESOURCE POTENTIAL
RESOURCES
SEDIMENTARY BASINS
SEISMIC SURVEYS
SURVEYS
TECTONICS