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Book Chapter

Exploration of Contemporaneous Delta and Deep-Water Deposits: Berriasian Lower Barrow Group, Exmouth Plateau, North Carnarvon Basin, Australia

By
Minken Jon
Minken Jon
Hess Exploration Level 18, Allendale Square 77 St Georges Terrace Perth, Western Australia 6000
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C. Robertson Handford
C. Robertson Handford
Consulting Sedimentologist PO Box 2622 Mountain View, Arkansas 72560
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Miller Josh
Miller Josh
Hess Exploration Production Technology 1501 McKinney Street Houston, Texas 77010
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Published:
December 01, 2012

Abstract

An active exploration campaign in the Exmouth Plateau has yielded gas discoveries in a coeval wave-influenced delta and deep-water, sand-rich fan succession. Depositional elements were organized into clinoform seismic stratigraphic units that blanketed irregular topography created by extensional tectonics. Clinoform geometries revealed steady, rising and falling shelf-slope break trajectories. Slope successions associated with rising trajectories were devoid of deep-water feeder systems. In contrast, during steady to falling trajectories, the slope was characterized by numerous gullies. These gullies served as the main delivery system for sediment gravity flows into the basin. In some instances, an individual gully dominated and captured the flows of subordinate gullies and developed into a larger feeder system. The feeder systems were self-sourced and cannibalized the deltaic and slope successions through knickpoint retreat.

Arcuate strandplains organized into wave-influenced cuspate lobes characterized the deltaic succession. Littoral drift was locally to the east. Delta front well information indicated excellent reservoir quality. Sedimentological analysis of core data indicated different depositional processes as a function of the clinoform geometries. High quality delta front sands were fed into the slope and basin floor as sediment gravity flows and deposited as coalescing sand-rich fans. The fan cores were composed of high-density turbidites that graded into debrites and linked debrites along the margins. The deep-water fans were of favorable to excellent reservoir quality.

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Contents

GCSSEPM

New Understanding of the Petroleum Systems of Continental Margins of the World

Norman C. Rosen
Norman C. Rosen
Houston, Texas
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Paul Weimer
Paul Weimer
Houston, Texas
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Sylvia Maria Coutes dos Anjos
Sylvia Maria Coutes dos Anjos
Houston, Texas
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Sverre Henrickson
Sverre Henrickson
Houston, Texas
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Edmundo Marques
Edmundo Marques
Houston, Texas
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Mike Mayall
Mike Mayall
Houston, Texas
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Richard Fillon
Richard Fillon
Houston, Texas
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Tony D’Agostino
Tony D’Agostino
Houston, Texas
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Art Saller
Art Saller
Houston, Texas
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Kurt Campion
Kurt Campion
Houston, Texas
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Tim Huang
Tim Huang
Houston, Texas
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Rick Sarg
Rick Sarg
Houston, Texas
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Fred Schroeder
Fred Schroeder
Houston, Texas
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SEPM Society for Sedimentary Geology
Volume
32
ISBN electronic:
978-0-9836097-8-0
Publication date:
December 01, 2012

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