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Structure and prospectivity of the Ceduna Delta; deep-water fold-thrust belt systems, Bight Basin, Australia

Justin MacDonald, Simon Holford and Rosalind King
Structure and prospectivity of the Ceduna Delta; deep-water fold-thrust belt systems, Bight Basin, Australia (in Papers presented at the 32nd annual GCSSEPM Foundation Bob F. Perkins research conference; New understanding of the petroleum systems of continental margins of the world, Norman C. Rosen (editor), Paul Weimer (editor), Sylvia Maria Coutes dos Anjos (editor), Sverre Henrickson (editor), Edmundo Marques (editor), Mike Mayall (editor), Richard Fillon (editor), Tony D'Agostino (editor), Art Saller (editor), Kurt Campion (editor), Tim Huang (editor), Rick Sarg (editor) and Fred Schroeder (editor))
Papers presented at the Gulf Coast Section, Society of Economic Paleontologists and Mineralogists Foundation Annual Bob F. Perkins Research Conference (2012) 32: 779-816

Abstract

The Ceduna subbasin forms part of the under-explored but highly prospective frontier Bight Basin located on the southern margin of South Australia. Structural mapping of the Ceduna subbasin reveals two separate delta lobes/systems deposited in the late Albian-Santonian and late Santonian-Maastrichtian. Each system is comprised of an updip delta top linked via a shale detachment to a down-dip delta toe or deep-water fold-thrust belt. These delta lobes are separated by a transgressive sequence of Turonian-Santonian age that deposited a thick marine mud, up to 2000 m in places. Like the Niger Delta, this marine mud forms the detachment for the overlying Santonian-Maastrichtian delta-deep-water fold-thrust belt system and is also a proposed source rock. An Albian marine mud forms the detachment for the older Cenomanian system and is also thought to exhibit source rock potential. We examine the differences in structural style between the western and eastern parts of the basin, the west being dominated by the Cenomanian lobe and the east by the Santonian-Maastrichtian lobe. Recent work on the sedimentary provenance of the basin suggests two different mechanisms were responsible for deposition of the delta lobes in the west and east, as well as significant changes in regional tectonics dominating the basin fill history. This has resulted in the deposition of two delta-deep-water fold-thrust belt systems rather than a continuous system as is commonly observed elsewhere in Cenozoic analogues such as the Niger Delta. Evidence from the drilling of Gnarlyknots-1A on the delta-top suggests excellent reservoir quality in the Santonian-Maastrichtian system; the potential for seal and source development increases farther offshore toward the deep-water fold-thrust belts. The abundant availability of deep-water contractional targets, combined with modeled increase in source and sealing potential farther offshore, results in a highly prospective system in both the Cenomanian and Santonian-Maastrichtian deep-water fold-thrust belts.


ISSN: 1544-2462
Serial Title: Papers presented at the Gulf Coast Section, Society of Economic Paleontologists and Mineralogists Foundation Annual Bob F. Perkins Research Conference
Serial Volume: 32
Title: Structure and prospectivity of the Ceduna Delta; deep-water fold-thrust belt systems, Bight Basin, Australia
Title: Papers presented at the 32nd annual GCSSEPM Foundation Bob F. Perkins research conference; New understanding of the petroleum systems of continental margins of the world
Author(s): MacDonald, JustinHolford, SimonKing, Rosalind
Author(s): Rosen, Norman C.editor
Author(s): Weimer, Pauleditor
Author(s): Coutes dos Anjos, Sylvia Mariaeditor
Author(s): Henrickson, Sverreeditor
Author(s): Marques, Edmundoeditor
Author(s): Mayall, Mikeeditor
Author(s): Fillon, Richardeditor
Author(s): D'Agostino, Tonyeditor
Author(s): Saller, Arteditor
Author(s): Campion, Kurteditor
Author(s): Huang, Timeditor
Author(s): Sarg, Rickeditor
Author(s): Schroeder, Frededitor
Affiliation: University of Adelaide, Australian School of Petroleum, Adelaide, South Aust., Australia
Pages: 779-816
Published: 2012
Text Language: English
Publisher: Society of Economic Paleontologists, Gulf Coast Section (GCSSEPM) Foundation, Houston, TX, United States
ISBN: 978-0-9836097-8-0
Meeting name: 32nd annual GCSSEPM Foundation Bob F. Perkins research conference
Meeting location: Houston, TX, USA, United States
Meeting date: 20121202Dec. 2-5, 2012
References: 52
Accession Number: 2017-003546
Categories: Economic geology, geology of energy sourcesStructural geology
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. col., sects., geol. sketch maps
S39°00'00" - S31°00'00", E126°00'00" - E138°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 201704
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